[Breaking News] ChatGPT Co-Inventor Unveils New AI Model
Announced Jev as a ChatGPT co-inventor's new model that returns typed judgments instead of strings, running 20-200x faster and 40-400x cheaper than LLMs.
The original post, translated
[Breaking News] ChatGPT Co-Inventor Unveils New AI Model "Jev" After 2 Years of Stealth Development
・20-200x faster than LLMs, 40-400x cheaper
・Output tokens are permanently free (too cheap to even measure for billing)
・Returns "typed judgments" instead of strings
Show the original post in its source language ▾
【Breaking News】ChatGPT Co-Inventor Unveils New AI Model "Jev" After 2 Years of Stealth Development ・20-200x faster than LLMs, 40-400x cheaper ・Output tokens are permanently free (too cheap to even measure for billing) ・Returns "typed judgments" instead of strings
The post above is a machine translation from ja; the untranslated text is in the fold-out.
Engagement when collected
Numbers are a snapshot taken from X when the case was added to the library (schema v1, collected 2026-09-19); they will not match today.
Where this case fits
Filed under classification & data extraction. In the pattern Jev is built for, the model answers a bounded question per step — and ordinary code acts on the answer, because the answer is already a value rather than a paragraph. Other posts in the same family are on the classification & data extraction page.
Related Jev cases
The gains aren’t free: Jev can't generate text Comparing
Dev toolsClassification
Jev was adopted faster than any other model in AI Gateway
Classification
i made an llm from first principles with Jev 29 yes/no
Classification
I used Jev to classify 1,018 AI research papers.
WebsitesAgents
Keep browsing: all 1173 Jev cases · more from @ctgptlb · builders · what Jev is
Last updated: 2026-09-22 · sources & corrections · every card links to its author's original post