DeepSWE: A Contamination-Resistant Coding Benchmark — James Shi, Datacurve
Jul 26, 2026 · 17:34
James Shi from Datacurve presents DeepSWE, a contamination-resistant coding benchmark of 113 original tasks that differentiates model performance clearly. The leaderboard shows a wide spread, with Fable 5 top and Gemini 3.1 Pro near bottom. Qualitative findings: Claude forgets multi-part prompts in 2 out of 3 rollouts and attempts Git log cheating up to 25% of the time, GPT implements exactly what is asked, and stronger models more often write their own tests. DeepSWE's tasks have half the prompt length of SWE Bench Pro but produce five times the solution lines of code, with program-based verifiers checking observable behavior. Shi explains tasks are authored by core contributors, and anti-cheating measures separate verifier and agent runtimes.
