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Jason Wei

@_jasonwei
ai researcher @meta, past: openai, google 🧠
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Joined October 2020
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    Jason Wei
    @_jasonwei
    Jul 16, 2025
    Becoming an RL diehard in the past year and thinking about RL for most of my waking hours inadvertently taught me an important lesson about how to live my own life. One of the big concepts in RL is that you always want to be “on-policy”: instead of mimicking other people’s
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    Jason Wei
    @_jasonwei
    Aug 12
    What's left for humans in a world where machine intelligence has so many advantages? I recently got a Tesla, and using full self-driving has been a wake up call to just how many advantages AI has over humans. The few times I disengaged it because I thought it was going into the
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    Jason Wei
    @_jasonwei
    Jul 14
    On HealthBench Pro, Muse Spark 1.1 achieves similar performance with GPT-5.6 Sol (maybe slightly better) at a fraction of the cost. Affordable health superintelligence is our north star!
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    Medical Sphere
    @MedicalSphereAI
    Jul 13
    We benchmarked Muse Spark 1.1 and GPT-5.6 Sol on HealthBench Professional, OpenAI's benchmark of 525 real clinician tasks 🏥🩺 Muse Spark 1.1 tops our board: better overall score than GPT-5.6 Sol, statistically on par on the length-adjusted score at a fraction of the cost
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    Jason Wei
    @_jasonwei
    Jul 9
    In addition to agents and coding, Muse Spark 1.1 is also really strong at answering health questions, a steadily growing use case for AI. On HealthBench-Pro, Muse Spark 1.1 achieves +5% better performance than Muse Spark 1.0 and beats all competitor models except Fable/Mythos.
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    Mark Zuckerberg
    Meta
    @finkd
    Jul 9
    (1) Today we're releasing Muse Spark 1.1 -- a strong agentic and coding model at a very low price. It's available through our new Meta Model API and in Meta AI.
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    Jason Wei
    @_jasonwei
    Apr 16
    Beautifully written piece by @FAbnousi about how AI for health might look like in the future The current data in health is limited because it only captures episodic clinical snapshots of what happens to our bodies The revelation is that there is so much latent knowledge in
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    Freddy Abnousi
    @FAbnousi
    Apr 16
    Medicine was built on the medical record. But most of health and illness happens outside of it. AI doesn’t create that gap — it exposes it. The question now is structural: where should this data live — under what rules, and for whose benefit? With @CelinaMYongMD in @statnews: