Anthropic launched Claude Opus 5.5 on September 22, 2026, reducing overall operating costs by 40% compared to the previous version. API pricing drops to $4 per million input tokens and $20 per million output tokens, while cache reads fall by 60% to $0.20 per million. The model scores 1,846 Elo on the GDPval-AA v2.1 benchmark, matching or exceeding Claude Fable 5.1, Anthropic’s higher-tier offering. Independent evaluators Frontier Design and METR found an 85% decrease in boundary-circumvention attempts. The model is available through the Claude API, Claude Platform, Amazon Bedrock, Google Cloud, and Microsoft Azure, covering the three dominant enterprise cloud environments.
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