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Anthropic releases Fable 5.2 and Mythos 5.2, llm-anthropic tool updated

By PulseAugur Editorial · [1 sources] ·

Anthropic has launched its latest models, Fable 5.2 and Mythos 5.2, with integration now available through the llm-anthropic tool. Early testing revealed that the highest reasoning level ('max') on Fable 5.2 encountered a token limit issue when generating an SVG of a pelican, a bug also observed with Opus 5.5 but not present in earlier Fable versions. This new release allows users to interact with Fable 5.2 via command-line prompts for various tasks. AI

IMPACT New model releases from Anthropic offer updated capabilities, though early testing reveals potential issues with reasoning levels that may require further refinement.

RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on Simon Willison →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic releases Fable 5.2 and Mythos 5.2, llm-anthropic tool updated

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Signal score
70 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Significant
Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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model release, product
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High
Clearly on-topic for AI-industry coverage.
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Breaking (< 6h)
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COVERAGE [1]

  1. Simon Willison TIER_1 English(EN) ·

    llm-anthropic 0.31

    <p><strong>Release:</strong> <a href="https://github.com/simonw/llm-anthropic/releases/tag/0.31">llm-anthropic 0.31</a></p> <p>Anthropic <a href="https://www.anthropic.com/claude-fable-and-mythos-5-2">released Fable 5.2 and Mythos 5.2</a> today. I've added them to <code>llm-anthr…

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