Anthropic today launched the latest version of its flagship Opus model: Opus 4.5.
The company calls it its most intelligent model yet and notes that it is especially strong in solving coding tasks, taking the crown from OpenAI’s GPT-5.1-Codex-Max and Google’s week-old Gemini 3 model with an SWE-Bench Verified accuracy score of 80.9%.
The company is also making Opus 4.5 significantly more affordable to use, with API pricing of $5 per million input tokens and $25 per million output tokens, down from $15/$75 per million input/output…

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