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    Claude Fable 5.1 · claude-fable-5-1

    Anthropic · 1 Sep 2026

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    85from 4
    benchmarks

    Release status: Not yet confirmed by public reporting. Specifications and benchmark performance: Not yet confirmed by public reporting.

    context: 1Mtextimagefile$10 / $50 per 1M tokens (in / out)

    Benchmark results

    Every figure links to where it was published. Compare like with like — harnesses and prompt setups differ between vendors.

    BenchmarkScoreSource
    OTIS Mock AIME 2024-25Competition mathematics100%1 Sep 2026View
    SimpleQA VerifiedShort factual questions (hallucination resistance)70.8%1 Sep 2026View
    LMArena TextHuman preference Elo from blind chat votes (not a percentage)1513 Elo22 Oct 2026View
    LMArena WebDevHuman preference Elo for building web apps (not a percentage)1742 Elo23 Oct 2026View

    Weighted mean of 2 verified benchmark results: OTIS Mock AIME 2024-25 100%, SimpleQA Verified 70.8%.

    Security & risk dashboardLatest vulnerabilities, advisories and real-world incidents for Claude Fable 5.1

    References

    Profile last reviewed 10/27/2026 and re-checked automatically every few hours against the vendor's published documentation, papers and public leaderboards. Scores come from the cited benchmark results above — confirm limits and pricing against the provider's own documentation before building on them.