DeepSeek's open model tops Claude Opus 5
Why it matters
DeepSeek released DeepSeek-V4.1-Flash-1017 on Oct 17, 2026, a minor update to V4.1 Flash that it says finishes tasks faster with shorter outputs. By DeepSeek's own numbers it scores 77.0 on DeepSWE v1.1 versus 74.0 for Claude Opus 5, and leads Opus 5 on Automation-Bench (60.5 vs 50.3) and Apex Bench (72.1 vs 65.8); versus the previous V4.1 Flash, Terminal-Bench 4.0 rose from 31.2 to 42.3. Opus 5 still leads on Terminal-Bench 4.0 (51.8) and HLE without tools (56.3 vs 42.6). Weights are on Hugging Face under the MIT license with a 1M-token context, and API pricing is unchanged (deepseek-flash). Vendor-reported benchmarks; independent tests to come.
Read the source: DeepSeek API Docs (opens in a new tab)
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