On Monday, Anthropic announced Opus 4.5, the latest version of its flagship model. It’s the last of Anthropic’s 4.5 series of models to be released, following the launch of Sonnet 4.5 in September and Haiku 4.5 in October.

As expected, the new version of Opus has state-of-the-art performance on a range of benchmarks, including coding benchmarks (SWE-Bench and Terminal-bench), tool use (tau2-bench and MCP Atlas) and general problem solving (ARC-AGI 2, GPQA Diamond).

Notably, Opus 4.5 is the first model to score over 80 percent on SWE-Bench verified, a respected coding benchmark.

Anthropic also emphasized the Opus’s computer use and spreadsheet capabilities, and launched a number of parallel products to showcase how the model holds up in those settings. Together with Opus 4.5, Anthropic w

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