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    PostTrainBench v1.2 release puts Fable 5.1 at the top of its model ranking

    The release post lists Opus 5.5, GPT-6 Astra and Fable 5 behind Fable 5.1, in that order.

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    5 Sources, ,

    TLDR

    A post announcing PostTrainBench v1.2 ranks Fable 5.1 ahead of Opus 5.5, GPT-6 Astra and Fable 5. A follow-up calls Fable 5.1 the strongest model on PTB and points readers to a thread about the update.

    Combined views

    7.1K

    5 Sources, first seen 12h ago

    81 likes

    Combined views

    7.1K

    5 Sources, first seen 12h ago

    81 likes
    12h ago
    first seen 12h ago
    8 comments
    7 saves
    10 reposts

    Sentiment

    Positive——Negative

    Summary

    Not enough discussion yet.

    No sentiment analysis available yet.

    Featured Source
    8 comments
    7 saves
    10 reposts

    Sentiment

    Positive——Negative

    Summary

    Not enough discussion yet.

    No sentiment analysis available yet.

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    5 Sources

    @full__rank@jackclarkSF's predicted that in September 2026 the official instruct model performance will be reached on PostTrainBench. This turned out to not be the case (at least for public models).
    @maksym_andrwe just released PTB v1.2: Fable 5.1 > Opus 5.5 > GPT-6 Astra > Fable 5! check out the thread below for our updates:
    @karinanguyenRT @thoughtfullab: PostTrainBench v1.2 is out! A few updates: 1. Cloud GPU support. You can now run the benchmark with identical settings…

    5 Sources

    @full__rank@jackclarkSF's predicted that in September 2026 the official instruct model performance will be reached on PostTrainBench. This turned out to not be the case (at least for public models).
    @maksym_andrwe just released PTB v1.2: Fable 5.1 > Opus 5.5 > GPT-6 Astra > Fable 5! check out the thread below for our updates:
    @karinanguyenRT @thoughtfullab: PostTrainBench v1.2 is out! A few updates: 1. Cloud GPU support. You can now run the benchmark with identical settings…