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![TheMattBerman Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::248742423.png) Matthew Berman [@TheMattBerman](/creator/twitter/TheMattBerman) on x 3003 followers
Created: 2025-07-20 13:52:27 UTC

@OpenAI @lmarena_ai 1/ I spotted this beast on July 17th, hiding in plain sight on under "Anonymous-Chatbot."

It's not GPT-5. It's not open-source.

It's an o3 variant optimized for tool-use and RL fine-tuning—and it's destroying every coding benchmark.

![](https://pbs.twimg.com/media/GwTjkmFWsAAKnkO.jpg)

XXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1946931209163923950/c:line.svg)

**Related Topics**
[open ai](/topic/open-ai)

[Post Link](https://x.com/TheMattBerman/status/1946931209163923950)