This morning, Anthropic's new flagship model Opus 5.2 quietly launched, starting a gradual test in Claude Code. Developers reported that its performance during calls was significantly different from the web version of Opus 5. After capturing packets, some found that the backend model slug had already been pointed to Opus 5.2—meaning this unannounced new version is already running in some developers' real workflows.
Even more shocking was an internal risk report from Anthropic that circulated at the same time. The report shows that the company is currently using an unpublished "nuclear-level" Model 2, which has taken over most of the company's code writing work and is said to replace 85% of the research team. This means that Anthropic is using AI to replace its own research staff, rather than just treating AI as a product to sell externally.
On one hand, Opus 5.2 quietly started a gradual release, and developers only confirmed its identity by capturing packets. On the other hand, the internal "nuclear-level" model has already begun rewriting the development organization structure. Together, these two clues point to the same thing: Anthropic's model iteration speed is accelerating, and this generation of models has already deeply taken over "writing code," exceeding people's previous expectations.
