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Five Things Developers Are Actually Building With JEV (And Why It Matters)

Actually Building With ... When TypeSafe AI came out of stealth in September 2026 with founder Diogo Almeida, a name attached to both ChatGPT and RLHF, the framing was almost…

Actually Building With ... When TypeSafe AI came out of stealth in September 2026 with founder Diogo Almeida, a name attached to both ChatGPT and RLHF, the framing was almost contrarian: not a smarter chatbot, but a model that refuses to write free text at all. Jev, their first "System One model," o

Open source ↗ dev.tocost-time-

Also filed under Research & data

  1. 0620

    Jev Score: rubrics, scores and confidence

    A worked guide to Jev's Score primitive: writing a request, defining rubric levels, reading recorded probabilities and the weighted-score math.

    Jev Trader · Research & data

  2. 0614

    Bot journey classification in WebDecoy

    Sends a detected bot's last 48 request paths to Jev, which picks what it's after (prices, articles…) and how it crawls (pagination, IDs…), or unknown.

    WebDecoy · Research & data

  3. 0610

    Fake / Real: link fact-checker with Jev as judge

    Paste an article or post link. Fake / Real extracts its claims, finds outside evidence, and has Jev judge whether the evidence supports or contradicts each one.

    @DansiDanutz · Research & data

  4. 0609

    AutoRubric: rubric-based evaluation

    Combines rubric science and LLM-as-a-judge research to grade outputs with AI judges: LLMs, decision models like Jev, or both.

    @deliprao · Research & data