Claude Fable 5 and Claude Mythos 5
… 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. …
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An update on our election safeguards
… Before each model launch, we run evaluations to measure how consistently, thoughtfully, and impartially Claude engages with prompts that express views from across the political spectrum. …
Introducing Claude Opus 4.7
… Opus 4.6 is one of the best models out there for developers, and this model is measurably more thorough on top of that. It passed Terminal Bench tasks that prior Claude models had failed, and worked through a tricky concurrency bug Opus 4.6 couldn't crack. …
Statement on the US government directive to suspend access to Fable 5 and Mythos 5
… If this standard was applied across the industry, we believe it would essentially halt all new model deployments for all frontier model providers. …
Donating our open-source alignment tool
Alignment Donating our open-source alignment tool May 7, 2026 In October 2025, we launched Petri , an open-source toolbox of alignment tests that can be applied to any large language model. …
Introducing Claude Opus 4.8
… It’s a great model to build with. On our Super-Agent benchmark, Claude Opus 4.8 is the only model to complete every case end-to-end, beating prior Opus models and GPT-5.5 at parity on cost. …
PwC is deploying Claude to build technology, execute deals, and reinvent enterprise functions for clients
… Office of the CFO PwC is launching a new business group focused on transforming client finance organizations with Claude. …
Project Glasswing: An initial update
Announcements Project Glasswing: An initial update May 22, 2026 Last month, we launched Project Glasswing , our collaborative effort to secure the world’s most critical software before increasingly capable AI models can be turned against it. …
Introducing The Anthropic Institute
… It took us two years to release our first commercial model, and just three more to develop models that can discover severe cybersecurity vulnerabilities , take on a wide range of real work , and even begin to accelerate the pace of AI development itself . …
Measuring LLMs’ ability to develop exploits
… For a given vulnerability, the language model is provided with build information vulnerable source code and build scripts , vulnerability information proof-of-vulnerability; vulnerability description , runtime information compiled binary; launch script , and a remote target running the vulnerable e… …