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OpenAI's GPT-6 Astra, Claude's prompt changes, and LLM tool updates detailed

By PulseAugur Editorial · [3 sources] ·

Simon Willison's latest blog posts discuss advancements in large language models, including OpenAI's new GPT-6 Astra model and its comparison grid. He also notes a change in Claude's system prompt that affects its ability to reproduce song lyrics. Additionally, Willison highlights performance improvements in the `llm` tool, specifically for logging usage and response durations, with contributions from Waveplate on GitHub. AI

IMPACT Provides insights into the capabilities and limitations of new LLM models and tools, informing AI practitioners about performance and behavioral changes.

RANK_REASON The cluster consists of blog posts and a Mastodon post discussing recent developments in LLMs, rather than a primary release or significant industry event.

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AI-generated summary · Google Gemini · from 3 sources. How we write summaries →

OpenAI's GPT-6 Astra, Claude's prompt changes, and LLM tool updates detailed

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The cluster consists of blog posts and a Mastodon post discussing recent developments in LLMs, rather than a primary release or significant industry event.
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model release, product
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COVERAGE [3]

  1. Simon Willison TIER_1 (CA) ·

    llm 0.35

    <p><strong>Release:</strong> <a href="https://github.com/simonw/llm/releases/tag/0.35">llm 0.35</a></p> <blockquote> <ul> <li>New OpenAI model: <code>gpt-6-astra</code> for <a href="https://openai.com/index/gpt-6-astra/">GPT-6 Astra</a>.</li> </ul> </blockquote> <p>Tags: <a href=…

  2. Simon Willison TIER_1 (CA) ·

    llm 0.34

    <p><strong>Release:</strong> <a href="https://github.com/simonw/llm/releases/tag/0.34">llm 0.34</a></p> <p>One new feature:</p> <blockquote> <ul> <li><code>llm logs --usage</code> Markdown output now includes the response duration in milliseconds and as a human-readable duration.…

  3. Mastodon — sigmoid.social TIER_1 English(EN) · [email protected] ·

    llm 0.35 https://simonwillison.net/2026/Sep/7/llm/ # AI # LLM # OpenSource

    llm 0.35 https://simonwillison.net/2026/Sep/7/llm/ # AI # LLM # OpenSource

    LINKS simonwillison.net/…/llm

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