Arena.ai ranks Claude Opus 5.5 (High) No. 2 in Agent Arena, with a +12.15% net improvement at a $1.31 median cost per task. It scores above Opus 5 (Max) and Opus 5 (High) while costing 40–56% less.
OpenEvidence says it announced a partnership with AnthropicAI during the UN General Assembly to make OpenEvidence available free of charge to physicians in low- and middle-income countries.
Databricks is making OpenAI’s GPT-6 Sol and GPT-6 Luna and AnthropicAI’s Claude Opus 5.5 available to its customers. Databricks says the GPT-6 models perform strongly at lower cost with a higher Pareto frontier on OfficeQA Pro, and that Claude Opus 5.5 improves cost efficiency on enterprise document parsing.
Arena.ai has added Claude Opus 5.5 to Agent Arena and to Battle Mode for WebDev, Text, Vision, and Document. Claude says it is the first Claude 5.5 model, performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.
AnthropicAI's Claude Opus 5.5 is generally available in GitHub Copilot for agentic coding, long-running agentic tasks, and knowledge work. GitHub's early testing found task resolution comparable to Claude Opus 5, with significantly fewer steps and tokens and fast error recovery on multistep tasks.
OpenRouter is offering AnthropicAI’s Claude Opus 5.5 with a 1 million-token context window at $4 per million input tokens and $20 per million output tokens, a rate it says is 20% lower per token than Opus 5.