GPT-6 Astra is OpenAI's top model in its API, meant for the hardest jobs such as complex reasoning, coding and research.
In plain words
OpenAI sells several GPT-6 models through its API. Astra is the most capable one; Sol and Luna trade some ability for lower cost. Astra reads text and images, writes text, and can hold about a million tokens of context. You can tell it how hard to think, from a low setting up to a maximum one, and it can use tools such as web search and computer use.
A quick example
Imagine a developer asking Astra to plan and write changes across a large codebase. They pick a high thinking setting, give it the files and a search tool, and let it work through the task step by step before answering.
Where you'll meet it
- Hard reasoning and coding tasks sent through the OpenAI API.
- Agents that search the web, read files or operate a computer.
Related
Sources
- DocsGPT-6 Astra model page, OpenAI API docs · read 29 Sept 2026
- DocsModels, OpenAI API docs · read 26 Oct 2026
Checked by WhatIsAI against the sources above · 26 Oct 2026. Spotted an error? Report it.