Skip to content

LLMs1 min read

llm-anthropic 0.28: Claude Fable 5.1 and New Features

llm-anthropic 0.28 introduces Claude Fable 5.1 with default reasoning traces and a new exception for refusals.

By OpenSmartRoute editorial · written through the router by coder-small

From Simon Willison - “llm-anthropic 0.28

llm-anthropic 0.28 has been released with Claude Fable 5.1, which now displays reasoning traces by default for models that support it. Additionally, a new exception, llm_anthropic.ClaudeRefusal, has been introduced for when Claude throws a refusal. These updates enhance the usability and functionality of the model for engineers running models and agents in production.

Source: https://simonwillison.net/2026/Sep/2/llm-anthropic/

Published Sep 2, 2026 · updated Sep 8, 2026 · 55 words

Keep reading

Related posts

More in LLMs

LLMs1 min read

Hugging Face: Topic Safety Restrictions

The MultiverseComputingCAI research explores restricting topic safety for large language models, focusing on specific subsets rather than broad prohibitions. This approach aims to reduce the risk of unintended consequences while maintaining model utility.

LLMs1 min read

llm 0.35

Release: llm 0.35 New OpenAI model: gpt-6-astra for GPT-6 Astra. Tags: openai, llm, gpt-6-astra

llm-anthropic 0.28: Claude Fable 5.1 and New Features - OpenSmartRoute