GPT-6.2 Astra begins gray testing! Claude Mythos 5.5 exposed on the same day

What happened: GPT-6.2 Astra appeared in some users' model lists and is usable, while Claude Mythos 5.5 briefly appeared in the official site's frontend code before being removed hours later. A HuggingFace repo claiming to hold leaked Mythos weights was also posted. Key numbers: Some users had 20% of Astra requests routed to 6.2, one user had 100%. Why it matters: The two model releases surfaced on the same day. The report says Mythos 5.5 will be a version covering biological research and cybersecurity, and notes the leaked weights are unlikely to be genuine.

GPT-6.2 Astra appeared in some users' model lists and is usable, while Claude Mythos 5.5 briefly appeared in the official site's frontend code before being removed hours later. A HuggingFace repo claiming to hold leaked Mythos weights was also posted.

The two model releases surfaced on the same day. The report says Mythos 5.5 will be a version covering biological research and cybersecurity, and notes the leaked weights are unlikely to be genuine.