Opus 5 5

Anthropic releases Opus 5.5 with lower pricing and Fable-level performance: Anthropic has launched its Opus 5.5 model, offering lower pricing and performance comparable to its Fable model. The company described the new release as the strongest-performing model it has tested to date.

Artificial Intelligence • TechCrunch AI

Opus 5.5 Is Crazy Good and GPT-6-Sol Launched Too: Anthropic and OpenAI have reportedly launched two new artificial intelligence models on the same day. The releases include Anthropic's Claude Opus 5.5 and OpenAI's GPT-6-Sol.

Technology • Matt Wolfe

Researchers hack OpenAI's GitHub monorepo via bug bounty program: Independent security researchers participating in OpenAI's bug bounty program successfully hacked the company, gaining access to its internal "monorepo" on GitHub. The team executed the breach using cybersecurity versions of Opus 4.8 and Opus 5.

Security • Techmeme

SAFE benchmark tests if frontier AI models seek safety evidence: Researchers introduced SAFE, a benchmark evaluating whether frontier models choose to acquire safety-relevant evidence before making deployment decisions. Testing on GPT-5.5, o3, Claude Opus 4.8, and Claude Sonnet 4.6 revealed distinct evidence-acquisition policies among the models.

AI safety • arXiv