Model selection for Claude and Codex agents on github.com - GitHub Changelog
…Claude Sonnet 4.6 Claude Opus 4.6 Claude Sonnet 4.5 Claude Opus 4.5 When using the Codex coding agent, the following models are currently available: GPT-5.2-Codex…
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People also ask
What’s next?
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 4.8Videos
More videosAnthropic Economic Index report: Learning curves
…Our sample covers February 5 to February 12, three months following the release of Claude Opus 4.5 and coincident with the release of Claude Opus 4.6. We first document how…
Anthropic Mythos model can find and exploit 0-days
…Mythos is markedly different from Claude Opus 4.6, which Anthropic only recently said was not very skilled at developing working exploit code. Where Opus 4.6 managed an exploit development success…
I tested Claude's two biggest competitors because of its usage limits, and one banned my account
…I used Opus 4.6 here because, at the time of testing, Opus 4.7 hadn’t been released yet. What I found surprised me in both directions. One of them is…
Discussions and forums
Anthropic just publically released its Mythos-grade AI at no extra cost for a limited time
…We’ve therefore launched the model with safeguards that mean queries on some topics will instead receive a response from our next-most-capable model, Claude Opus 4.8. To release the…
Partnering with Mozilla to improve Firefox’s security
…to improve security. Opus 4.6 is currently far better at identifying and fixing vulnerabilities than at exploiting them. This gives defenders the advantage. And with the recent release of Claude Code…
Anthropic's Fable AI brings the capabilities of its unreleased Mythos model to regular users - Engadget
…earlier, Claude will automatically route prompts on some topics through the less-capable Opus 4.8. "To release [Fable 5] both safely and quickly, we've tuned these safeguards conservatively — they'll…
Introducing Sonnet 4.6
…They often even prefer it to our smartest model from November 2025, Claude Opus 4.5. Performance that would have previously required reaching for an Opus-class model—including on real-world…
Data residency (US + EU) and FedRAMP-authorized models now available in Copilot - GitHub Changelog
…copilot Jun.19 Release AI credits consumed per user now in the Copilot usage metrics API account management copilot enterprise management tools Jun.18 Retired Upcoming deprecation of Opus 4.6 (fast…
Measuring LLMs’ ability to develop exploits
…time-of-release, the performance of models prior to Opus 4.5 follows a log-linear trajectory, with a mean doubling time of 1.1 months. Our models since Opus 4.5…