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DeepSeek V4.1 Flash wins 5 of the 15 benchmarks it shares with Claude Opus 5 — by an average of 1.94 points, while undercutting it by up to 41.7× on output price. Opus 5's 10 wins average 10.19 points. Full vendor data, community test reports, pricing math, charts and a routing verdict.
Terminal-Bench 2.1: DeepSeek V4.1 Flash remains public-board leader at 90.6%. Adds Step 5 Preview at 85.0% as a separately labeled StepFun provider run with API pricing and harness caveats. Updated October 16, 2026.