Introducing Claude Opus 4.8
… It improves on Opus 4.6 and fixes the comment-verbosity and tool-calling issues we saw with Opus 4.7. This release from Anthropic translates directly into faster capability gains for engineers building on Devin. …
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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 4.8Introducing Claude Opus 4.7
… It’s a more intelligent, more efficient Opus 4.6: low-effort Opus 4.7 is roughly equivalent to medium-effort Opus 4.6. On our 93-task coding benchmark, Claude Opus 4.7 lifted resolution by 13% over Opus 4.6, including four tasks neither Opus 4.6 nor Sonnet 4.6 could solve. …
Introducing Claude Opus 4.5
… A step forward on safety As we state in our system card , Claude Opus 4.5 is the most robustly aligned model we have released to date and, we suspect, the best-aligned frontier model by any developer. …
Claude Opus 4.6
… Claude Opus 4.6 feels noticeably better than Opus 4.5 in Windsurf, especially on tasks that require careful exploration like debugging and understanding unfamiliar codebases. We’ve noticed Opus 4.6 thinks longer, which pays off when deeper reasoning is needed. …
An update on recent Claude Code quality reports
… A few weeks before we released Opus 4.7, we started tuning Claude Code in preparation. Each model behaves slightly differently, and we spend time before each release optimizing the harness and product for it. …
Claude Fable 5 and Claude Mythos 5
… Our priority was to safely release Fable as soon as we could, even at the cost of overly broad safeguards. Therefore, for the time being we have arranged for Fable to fall back to Opus 4.8 on most requests related to biology and chemistry. …
Anthropic 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. …
An update on our election safeguards
… Here, Opus 4.7 and Sonnet 4.6 scored 95% and 96%, respectively. …
Partnering with Mozilla to improve Firefox’s security
… Most issues have been fixed in Firefox 148, with the remainder to be fixed in upcoming releases. …
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, economically valuable office tasks —is now available with Sonnet 4.6. …