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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 refreshed Sep 25: DeepSeek V4.1 Flash leads the public tbench.ai board at 90.6%. Adds Cognition-reported SWE-2 at 92.8% as a separate, unranked Devin CLI run—not a public-board result. 50+ CLI agents tracked.