Claude Opus 4.1

Emergent Mind aggregates independent academic evaluations of Claude Opus 4.1 (claude-opus-4-1), positioning it as a large multimodal vision-language model from Anthropic. Two large-scale benchmarking studies, dated September 29 and September 30, 2025, examine the model in high-stakes professional contexts including exp The aggregated findings report Opus 4.1 achieved a mean diagnostic accuracy of 0.01 (1%) on the RadLE v1 benchmark of 50 expert-level spot-diagnosis medical imaging cases, statistically indistinguishable from chance. Reported comparator means include board-certified radiologists at 0.83, radiology trainees at 0.45, GPT

Overchat AI's hub article, last updated September 13, 2026, characterizes Claude Opus 4.1 as an incremental drop-in replacement for Opus 4 rather than a generational leap. It surfaces specifications not detailed in other candidates: a 200,000-token context window, 32,000-token output limit, and an expanded thinking cap Beyond benchmarks, Overchat notes Windsurf's internal testing showed the Opus 4 to 4.1 jump equates to a full standard deviation gain on their junior developer benchmark—the same magnitude Windsurf saw between Sonnet 3.7 and Sonnet 4—suggesting real-world gains may exceed what the public metrics indicate. Access surfac