Anthropic releases Claude Opus 5.5

Anthropic 发布 Claude Opus 5.5

Anthropic launched Claude Opus 5.5, the first model in the Claude 5.5 series. It matches Claude Fable 5.1 on most tasks and costs 40% less to run than Opus 5. The post doesn't disclose benchmark scores or pricing.

Why it matters: Anthropic flagship model release with two hard numbers but no benchmarks or pricing disclosed. HKR all hit; the only deduction is that the post doesn't spell out actual scores or dollar figures, so we can't judge what 40% cost reduction means at scale.