AI news

Also that day

1. Model

   Anthropic releases Claude Sonnet 5.5 (opens the original source in a new tab)

   The second model in the Claude 5.5 family. Anthropic says it runs over 30% faster than Sonnet 5 and costs up to 30% less for most work.

   Anthropic · Original source ↗ (opens in a new tab)

2. Open source

   Ollama 0.35 adds decision models (opens the original source in a new tab)

   Ollama can now run decision models, which return choices, probabilities and scores instead of text, for jobs like ticket triage and routing.

   Ollama · Original source ↗ (opens in a new tab)

3. Research

   Post-training leaves traces in unrelated behaviour (opens the original source in a new tab)

   Researchers find that what a model learns in post-training can pass to other models through text that has nothing to do with the task.

   249 upvotes

   Paper · Original source ↗ (opens in a new tab)

4. GitHub

   PageIndex (opens the original source in a new tab)

   A document index for RAG that finds answers by reasoning over a document's structure instead of vector search.

   VectifyAI / PageIndex835 stars today37,391 total starsPythonas of 29 Sept