Measuring AI agent autonomy in practice
…released Fast Mode for Opus 4.6, which generates output 2.5x faster than regular Opus. 6. For turn duration across other percentiles, see the Appendix . 7. Specifically, we use Claude to…
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Users will find Opus 4.8 to be a modest but tangible improvement on its predecessor. There’s still more to be done: we’re working on developing and releasing models that provide many of the same capabilities as Opus at a lower cost. Not only that, but we plan to release a new class of model with even higher intelligence than Opus. As part of Project Glasswing, a small number of organizations are currently using Claude Mythos Preview for cybersecurity work. Models of this capability level require stronger cyber safeguards before they can be generally released. We’re making swift progress on dev
Introducing Claude Opus 4.8Top stories
Vibe physics: The AI grad student
…Summary I guided Claude Opus 4.5 through a real theoretical physics calculation, encapsulating the complexity of code and computations behind text prompts. The result was a technically rigorous, impactful high-energy…
Anthropic Economic Index report: Economic primitives
…1 In this chapter we analyze how Claude usage and diffusion patterns changed from August 2025 to November 2025 just prior to the release of Opus 4.5. We make four observations…
A global workspace in language models
…In this scenario, drawn from our actual pre-release audit of Claude Opus 4.6, the model is asked to improve a system's performance score. Rather than actually improve the system…
Assessing Claude Mythos Preview’s cybersecurity capabilities
…We commit to releasing this vulnerability at 4fa6abd24d24a0e2afda47f29244720fee33025be48f48de946e3d27 once it has been patched. Evaluating Claude Mythos Preview’s other cybersecurity capabilities Reverse engineering The above case studies exclusively evaluate the ability of…
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