Claude Opus 5.5
Anthropic says Opus 5.5 delivers Opus-class gains at 40% lower typical running cost.
The release is pitched as the first model in Claude’s 5.5 family, with stronger coding, knowledge-work, computer-use, and communication results than Opus 5. Anthropic says it is cheaper per token, uses fewer tokens per task, and generates output more than 30% faster than Opus 5. The company also emphasizes safety testing: external evaluators reviewed it, its automated behavioral audit score is Anthropic’s best so far, and high-risk cyber and biology work remains behind safeguards or verification programs. Sonnet 5.5 and Haiku 5.5 are slated to follow in the coming weeks. HN · GitHub AI's note
The release is pitched as the first model in Claude’s 5.5 family, with stronger coding, knowledge-work, computer-use, and communication results than Opus 5. Anthropic says it is cheaper per token, uses fewer tokens per task, and generates output more than 30% faster than Opus 5. The company also emphasizes safety testing: external evaluators reviewed it, its automated behavioral audit score is Anthropic’s best so far, and high-risk cyber and biology work remains behind safeguards or verification programs. Sonnet 5.5 and Haiku 5.5 are slated to follow in the coming weeks. HN · GitHub AI's note
score 9