New explainers, updates and corrections on whatisai, newest first.https://whatisai.fyihttps://whatisai.fyi/artificial-intelligencehttps://whatisai.fyi/artificial-intelligencePublished the full Artificial intelligence explainer. It is the starting point for the site's introductory learning path.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/llmhttps://whatisai.fyi/llmPublished the full Large language model explainer. Readers need a grounded explanation of tokens, training and generation before following model news.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/ai-agentshttps://whatisai.fyi/ai-agentsPublished the full AI agents explainer. It explains the model, tool and control loop behind agentic applications.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/raghttps://whatisai.fyi/ragPublished the full Retrieval-Augmented Generation explainer. It gives readers a concrete path from indexed documents to a grounded answer.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/embeddingshttps://whatisai.fyi/embeddingsPublished the full Embeddings explainer. Embeddings connect token representations, semantic search and retrieval systems.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/mcphttps://whatisai.fyi/mcpPublished the full Model Context Protocol explainer. It explains how AI applications connect to external tools and data through a shared protocol.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/gpushttps://whatisai.fyi/gpusPublished a new explainer. A GPU is a chip built to run many similar calculations at the same time, which suits the matrix maths inside neural networks.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/flopshttps://whatisai.fyi/flopsPublished a new explainer. FLOPs count the small arithmetic steps, like one multiply or one add on decimal numbers, that a computer does to train an AI model.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/agent-statehttps://whatisai.fyi/agent-statePublished a new explainer. Agent state is the running record an AI agent keeps while it works, so a task can pause, resume, or recover from a crash.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/prompt-injectionhttps://whatisai.fyi/prompt-injectionPublished a new explainer. Prompt injection is text that sneaks new instructions into what an AI model reads, so the model behaves in unintended ways.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/cpushttps://whatisai.fyi/cpusPublished a new explainer. A CPU is the chip that runs a computer's software, carrying out instructions with just a few cores backed by lots of cache memory.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/tpushttps://whatisai.fyi/tpusPublished a new explainer. TPUs are chips Google designed to speed up the maths of machine learning, rented out through Google Cloud.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/npushttps://whatisai.fyi/npusPublished a new explainer. An NPU is a part of a chip built to speed up AI models at low power.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/ai-acceleratorshttps://whatisai.fyi/ai-acceleratorsPublished a new explainer. AI accelerators are chips built to speed up the maths inside AI models, which is largely multiply-add sums.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/guardrailshttps://whatisai.fyi/guardrailsPublished a new explainer. Guardrails are checks placed around an AI model that inspect what goes in and what comes out, and can block, change or check inputs and replies that are unsafe, off-topic or break the app's rules.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/evalshttps://whatisai.fyi/evalsPublished a new explainer. An eval checks an AI system's work. You feed it an input and use a set of rules to score what comes back.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/llm-evaluationhttps://whatisai.fyi/llm-evaluationPublished a new explainer. LLM evaluation means testing an AI feature with structured tests, so you can check how accurate and reliable it is even though its answers vary.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/agent-evaluationhttps://whatisai.fyi/agent-evaluationPublished a new explainer. Agent evaluation tests an AI agent on set tasks, checking both its final result and the steps it took, over several tries.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/agent-orchestrationhttps://whatisai.fyi/agent-orchestrationPublished a new explainer. Agent orchestration is how an app with several AI agents decides which agent works, in what order, and who picks what happens next.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/amazon-bedrockhttps://whatisai.fyi/amazon-bedrockPublished a new explainer. Amazon Bedrock is an AWS service that lets developers call AI models from several companies through one set of APIs, with extra tools for search and safety.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/benchmarkshttps://whatisai.fyi/benchmarksPublished a new explainer. A benchmark is a fixed set of test tasks with a scoring rule, so different AI models can be compared on the same exam.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/claude-codehttps://whatisai.fyi/claude-codePublished a new explainer. Claude Code is Anthropic's coding assistant that reads a project, edits files and runs commands for you, asking before risky steps.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/context-compactionhttps://whatisai.fyi/context-compactionPublished a new explainer. Context compaction swaps the older part of a long AI conversation for a short summary, so the chat can keep going inside the model's memory limit.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/contextual-retrievalhttps://whatisai.fyi/contextual-retrievalPublished a new explainer. Contextual retrieval has a model write a short note that places each chunk in its document, then indexes the note with the chunk so search can find it.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/crewaihttps://whatisai.fyi/crewaiPublished a new explainer. CrewAI is an open-source toolkit, written in Python, for building teams of AI agents, each with a role, that work through a list of tasks together.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/cursorhttps://whatisai.fyi/cursorPublished a new explainer. Cursor is a coding tool with an AI agent that can read your project, edit files and run commands for you.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/data-privacyhttps://whatisai.fyi/data-privacyPublished a new explainer. Data privacy is about what an AI company may do with your chats, such as training models, and the settings that let you limit it.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/feature-engineeringhttps://whatisai.fyi/feature-engineeringPublished a new explainer. Feature engineering turns raw data, like prices and colour names, into the lists of numbers a model can learn from.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/github-copilothttps://whatisai.fyi/github-copilotPublished a new explainer. GitHub Copilot is an AI helper for programmers that offers the next lines of code while you write, explains code when you ask, and can take on jobs you give it.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/google-adkhttps://whatisai.fyi/google-adkPublished a new explainer. Google ADK is an open-source toolkit from Google for writing AI agents in code, giving them tools, a record of each chat and helper agents.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/graphraghttps://whatisai.fyi/graphragPublished a new explainer. GraphRAG turns your documents into a map of people, places and links, groups and summarises it, then answers questions from that map.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/haystackhttps://whatisai.fyi/haystackPublished a new explainer. An open-source Python toolkit from deepset that builds AI apps (search, RAG, agents) by linking small parts into a pipeline.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/hnswhttps://whatisai.fyi/hnswPublished a new explainer. HNSW finds the stored vectors closest to a query quickly by searching a stack of linked graphs, from a sparse top layer down to a dense bottom one.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/human-in-the-loophttps://whatisai.fyi/human-in-the-loopPublished a new explainer. With this setup, a person checks an AI system's work at chosen points and can approve it, change it, reject it or step in.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/jailbreakshttps://whatisai.fyi/jailbreaksPublished a new explainer. A jailbreak is a prompt written to trick an AI model into ignoring its safety training and producing something it would normally refuse.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/knowledge-graphshttps://whatisai.fyi/knowledge-graphsPublished a new explainer. A knowledge graph stores facts as labelled links between real-world things, so software can follow the links to answer questions.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/langgraphhttps://whatisai.fyi/langgraphPublished a new explainer. LangGraph is an open-source framework for building AI agents as graphs, where steps share one state that can be saved, paused and resumed.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/llamaindexhttps://whatisai.fyi/llamaindexPublished a new explainer. LlamaIndex is an open-source toolkit that brings your own files and data to a language model when you ask a question, so apps and agents can answer from them.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/llmopshttps://whatisai.fyi/llmopsPublished a new explainer. The day-to-day work of running an app built on a language model, from managing prompts and testing answers to watching speed and cost.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/lost-in-the-middlehttps://whatisai.fyi/lost-in-the-middlePublished a new explainer. Language models often use facts near the opening or closing of a long input better than facts buried in the middle.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/metadata-filteringhttps://whatisai.fyi/metadata-filteringPublished a new explainer. Metadata filtering limits a vector search to records whose labels, such as category or year, match rules you set.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/microsoft-foundryhttps://whatisai.fyi/microsoft-foundryPublished a new explainer. Microsoft Foundry is Microsoft's Azure platform for building AI apps and agents, with a large model catalogue, tools, testing and safety controls in one place.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/ollamahttps://whatisai.fyi/ollamaPublished a new explainer. Ollama is an open-source program that downloads open AI models and runs them on your own computer, with a simple command and a local API.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/pytorchhttps://whatisai.fyi/pytorchPublished a new explainer. PyTorch is a free Python library for building and training neural networks, with fast maths on GPUs and automatic gradients.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/rate-limitshttps://whatisai.fyi/rate-limitsPublished a new explainer. A rate limit caps how much you can use an AI service in a set stretch of time, such as how many requests you send each minute.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/reacthttps://whatisai.fyi/reactPublished a new explainer. ReAct is a prompting method in which a language model alternates written thoughts with tool actions, reading each result before it picks the next step.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/red-teaminghttps://whatisai.fyi/red-teamingPublished a new explainer. Red teaming means deliberately testing an AI system the way an attacker would, to find its weak spots.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/sandboxing-agentshttps://whatisai.fyi/sandboxing-agentsPublished a new explainer. Sandboxing an agent means running its commands inside a fence, set up by the operating system, that limits which files and websites they can reach.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/sub-agentshttps://whatisai.fyi/sub-agentsPublished a new explainer. A sub-agent is a helper AI that a main agent sends off to do one side task in its own workspace, then report back a short result.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/supervised-fine-tuninghttps://whatisai.fyi/supervised-fine-tuningPublished a new explainer. Supervised fine-tuning keeps training an already-trained model on example questions paired with good answers, so it learns to answer that way.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/token-costshttps://whatisai.fyi/token-costsPublished a new explainer. AI model APIs charge by the token, with separate prices for the text you send in and the text the model writes back.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/lorahttps://whatisai.fyi/loraPublished a new explainer. LoRA adapts a large model to a new task by freezing its weights and training two thin matrices whose product is added to them.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/pefthttps://whatisai.fyi/peftPublished a new explainer. PEFT is a free Hugging Face library that teaches a big AI model a new task by training a small set of extra weights instead of the whole model.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/vertex-aihttps://whatisai.fyi/vertex-aiPublished a new explainer. Vertex AI is Google Cloud’s platform for choosing AI models, tuning them on your own examples and running models and agents for real users.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/on-device-aihttps://whatisai.fyi/on-device-aiPublished a new explainer. On-device AI runs the model on your own phone, laptop or browser, so your data does not have to go to a server.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/llm-as-a-judgehttps://whatisai.fyi/llm-as-a-judgePublished a new explainer. LLM-as-a-judge means asking a strong language model to grade answers to open-ended questions.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/summarizationhttps://whatisai.fyi/summarizationPublished a new explainer. Summarization is when a model turns a long text into a shorter version that keeps the important information.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/llm-observabilityhttps://whatisai.fyi/llm-observabilityPublished a new explainer. LLM observability means recording what an AI app does on each request, such as the prompt, each step, the time taken and the tokens used.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/prompt-cachinghttps://whatisai.fyi/prompt-cachingPublished a new explainer. Prompt caching saves the work a model did on the unchanged start of a prompt, so the next request with the same start is faster and cheaper.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/pydantic-aihttps://whatisai.fyi/pydantic-aiPublished a new explainer. Pydantic AI is a Python framework for building AI agents whose tool inputs and final answers are checked against types you define.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/model-servinghttps://whatisai.fyi/model-servingPublished a new explainer. Model serving means running a trained model on a server so apps can send it requests over the network and get answers back.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/kv-cachehttps://whatisai.fyi/kv-cachePublished a new explainer. A KV cache lets a language model save work from earlier tokens, so each new token does not redo the same maths.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/openai-agents-sdkhttps://whatisai.fyi/openai-agents-sdkPublished a new explainer. OpenAI's Agents SDK is a small open-source toolkit from OpenAI for building AI agents that use tools, pass work to each other and can record each run as a trace.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/llm-gatewayshttps://whatisai.fyi/llm-gatewaysPublished a new explainer. An LLM gateway is one server that sits between your apps and AI model providers, adding limits, caching, fallbacks and logs to model calls.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/json-modehttps://whatisai.fyi/json-modePublished a new explainer. JSON mode is an API setting that asks a language model to reply in JSON, text a program can parse (read into data), and on some providers, such as OpenAI, enforces valid syntax, without fixing which keys or types appear.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/context-engineeringhttps://whatisai.fyi/context-engineeringPublished a new explainer. Context engineering is choosing, trimming and updating the tokens a model sees at each step, so an AI agent works from a small, useful context.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/amazon-bedrock-agentcorehttps://whatisai.fyi/amazon-bedrock-agentcorePublished a new explainer. A set of AWS services, called Amazon Bedrock AgentCore, for running AI agents in the cloud, with hosting, memory, sign-in, tool access and monitoring.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/agent-memoryhttps://whatisai.fyi/agent-memoryPublished a new explainer. Agent memory is how an AI agent saves useful information outside the model and loads the right pieces back into its prompt later.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/claude-agent-sdkhttps://whatisai.fyi/claude-agent-sdkPublished a new explainer. Anthropic's Claude Agent SDK is a Python and TypeScript library for building agents that run on the same loop, tools and context handling as Claude Code.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/batch-inferencehttps://whatisai.fyi/batch-inferencePublished a new explainer. Batch inference sends many AI requests as one job that runs in the background, trading an instant reply for a lower price.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/a2a-protocolhttps://whatisai.fyi/a2a-protocolPublished a new explainer. A2A is an open protocol for AI agents: one agent can find another, hand it a task and track the result, even when different companies built them.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/benchmark-contaminationhttps://whatisai.fyi/benchmark-contaminationPublished a new explainer. Benchmark contamination happens when test questions, or close copies of them, end up in a model's training data, so its score can look better than its real skill.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/langchainhttps://whatisai.fyi/langchainPublished a new explainer. LangChain is an open-source framework for building apps and agents on top of large language models, with one standard way to talk to many AI providers.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/agentic-workflowshttps://whatisai.fyi/agentic-workflowsPublished a new explainer. An agentic workflow runs a task as several language model and tool steps, joined by a path that your code fixes in advance.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/aws-inferentiahttps://whatisai.fyi/aws-inferentiaPublished a new explainer. AWS Inferentia is a family of computer chips that Amazon designed to run trained AI models cheaply and quickly in its cloud.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/azure-openaihttps://whatisai.fyi/azure-openaiPublished a new explainer. Azure OpenAI lets companies use OpenAI's models through Microsoft's Azure cloud, with Azure billing, safety filters and data controls.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/quantizationhttps://whatisai.fyi/quantizationPublished a new explainer. Quantization stores a model's numbers with fewer bits, such as 8-bit integers instead of 32-bit decimals, so it needs less memory.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/agent-planninghttps://whatisai.fyi/agent-planningPublished a new explainer. Agent planning is how an AI agent splits a big task into smaller steps first, then carries out those steps one by one.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/aws-trainiumhttps://whatisai.fyi/aws-trainiumPublished a new explainer. AWS Trainium is a computer chip Amazon designed for training and running AI models, rented through special Amazon EC2 cloud servers.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/multi-agent-systemshttps://whatisai.fyi/multi-agent-systemsPublished a new explainer. A multi-agent system is a group of AI agents, each a language model using tools in its own loop, that work together on one job.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/approximate-nearest-neighbor-searchhttps://whatisai.fyi/approximate-nearest-neighbor-searchPublished a new explainer. Approximate nearest neighbor search finds stored vectors that are very close to a query quickly, by checking only a promising part of the collection and accepting a few misses.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/inference-optimizationhttps://whatisai.fyi/inference-optimizationPublished a new explainer. Inference optimization is a set of methods, like caching, quantization and speculative decoding, that let a trained language model answer with less work or less memory.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/strands-agentshttps://whatisai.fyi/strands-agentsPublished a new explainer. Strands Agents is a free AWS toolkit, released as open source under Apache 2.0, for making AI agents with Python or TypeScript, where the model itself plans the steps and picks the tools.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/voice-agentshttps://whatisai.fyi/voice-agentsPublished a new explainer. A voice agent is an AI app you talk to out loud; it listens, works out what you want, can use tools, and answers in speech.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/agnohttps://whatisai.fyi/agnoPublished a new explainer. Agno is open-source software for building AI agents and running them as a live service. You can build single agents, teams of agents and step-by-step workflows.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/indirect-prompt-injectionhttps://whatisai.fyi/indirect-prompt-injectionPublished a new explainer. Indirect prompt injection is when an attacker hides instructions in content an AI app reads later, such as an email or web page, instead of typing them in.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/code-interpretershttps://whatisai.fyi/code-interpretersPublished a new explainer. A code interpreter lets an AI model write a small program, run it in a sealed-off sandbox, and use the result in its answer.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/autogenhttps://whatisai.fyi/autogenPublished a new explainer. AutoGen is an open-source Microsoft framework for building apps where several AI agents talk to each other, and sometimes to people, to finish a task.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/hugging-facehttps://whatisai.fyi/hugging-facePublished a new explainer. Hugging Face runs the Hub, a website where people share AI models, datasets and small demo apps so others can find, download and reuse them.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/comfyuihttps://whatisai.fyi/comfyuiPublished a new explainer. ComfyUI is a free, open-source app where you build AI image, video and audio generators by wiring boxes called nodes together.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/mlopshttps://whatisai.fyi/mlopsPublished a new explainer. MLOps is a way of working that makes building and releasing machine learning models simpler and more automatic.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/qlorahttps://whatisai.fyi/qloraPublished a new explainer. QLoRA fine-tunes a large language model by storing its frozen weights in 4 bits and training only a small add-on that sits beside them.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/fine-tuninghttps://whatisai.fyi/fine-tuningPublished a new explainer. Fine-tuning takes a model that is already trained and keeps training it on a smaller set of examples for one task.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/hydehttps://whatisai.fyi/hydePublished a new explainer. HyDE has a language model write a made-up answer to your question, then searches for real documents that look like that answer.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/model-routinghttps://whatisai.fyi/model-routingPublished a new explainer. Model routing sends each prompt to the model that suits it, so simple requests go to cheaper models and hard ones to stronger models.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/open-webuihttps://whatisai.fyi/open-webuiPublished a new explainer. Open WebUI, a free chat app you host yourself, lets you talk to AI models running on your own computer or in the cloud, from one web page.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/sglanghttps://whatisai.fyi/sglangPublished a new explainer. SGLang is open-source server software that runs large language models on GPUs and answers many requests quickly, partly by reusing work shared between prompts.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/mastrahttps://whatisai.fyi/mastraPublished a new explainer. Mastra is an open-source TypeScript toolkit for making AI agents, step-by-step workflows and the apps that use them.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/self-reflectionhttps://whatisai.fyi/self-reflectionPublished a new explainer. Self-reflection is when an AI model checks its own first answer, writes feedback on it, and then tries again using that feedback.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/llama-cpphttps://whatisai.fyi/llama-cppPublished a new explainer. llama.cpp is an open-source program that runs large language models on your own computer.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/hugging-face-transformershttps://whatisai.fyi/hugging-face-transformersPublished a new explainer. Transformers is a free, open-source Python library that lets you download a ready-trained AI model by name and run or train it with a short piece of code.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/self-hosting-llmshttps://whatisai.fyi/self-hosting-llmsPublished a new explainer. Self-hosting means running a language model on a computer you control, so your prompts go to your own machine instead of a company's service.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/smolagentshttps://whatisai.fyi/smolagentsPublished a new explainer. Smolagents is a small open-source Python library from Hugging Face for building AI agents, including ones that act by writing short pieces of Python code.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/amazon-sagemaker-aihttps://whatisai.fyi/amazon-sagemaker-aiPublished a new explainer. SageMaker AI, from AWS, lets you build, train and run machine learning models without managing your own servers.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/unslothhttps://whatisai.fyi/unslothPublished a new explainer. Unsloth is an open-source tool for training and running AI language models on your own computer, built to fine-tune them faster and with less graphics-card memory.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/semantic-kernelhttps://whatisai.fyi/semantic-kernelPublished a new explainer. Semantic Kernel is an open-source Microsoft toolkit that connects AI models to your own code, so a model can ask your functions to do real work.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/dspyhttps://whatisai.fyi/dspyPublished a new explainer. DSPy is a Python framework where you describe an AI job by naming its inputs and outputs, and it tunes the prompts for you.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/vercel-ai-sdkhttps://whatisai.fyi/vercel-ai-sdkPublished a new explainer. The Vercel AI SDK is an open-source TypeScript toolkit, free to use, that lets apps talk to AI models from many companies through the same code.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/vllmhttps://whatisai.fyi/vllmPublished a new explainer. vLLM is open-source software that runs large language models on a server and answers many requests at once, using GPU memory carefully so fewer bytes go to waste.Mon, 28 Sep 2026 00:00:00 GMThttps://whatisai.fyi/updates/#2026-09-27https://whatisai.fyi/updates/#2026-09-27Created the catalogue, removed the low-value Code repos category, and added the current Gemma 4, Jev and Laya model records. The catalogue should help readers understand AI, not inflate its count with repository names.Sun, 27 Sep 2026 00:00:00 GMThttps://whatisai.fyi/updates/#2026-09-27https://whatisai.fyi/updates/#2026-09-27Removed superseded model versions and discontinued or redundant products, normalized current product names, and added seven current model and product references. The catalogue should lead with what readers encounter now while retaining only historically useful landmark terms.Sun, 27 Sep 2026 00:00:00 GMT