Claude Opus 4.1
An incremental refinement of Claude Opus 4 with improved coding and agentic accuracy
Claude Opus 4.1, released in August 2025, is a targeted update to Claude Opus 4 rather than a new generation. Anthropic focused the update on coding and agentic accuracy, and it pushed the SWE-bench Verified score up to roughly 74.5 percent, a meaningful jump on the real-world GitHub issue benchmark that Anthropic uses to track coding ability. It kept the same 200,000 token context window, image input support, and $15/$75 per million token pricing as Opus 4, and it gained the ability to use up to 64,000 tokens of extended thinking for harder problems. Anthropic described it as a drop-in replacement for Opus 4, meant to hold the top of the Opus line until the next full model generation shipped.