DeepSeek-V4.1-Flash-1017 launches on web, app and API with open weights; Search & Fetch cost $0.75/1,000 calls each, with server-side calls via DeepSeek Harness, Claude Code and Codex free for API users until Oct 31, 16:00 UTC.

DeepSeek’s official DeepSWE v1.1 performance-versus-cost chart for V4.1-Flash-1017 using the mini_swe_v2 harness; company-reported results, not an independent evaluation.

Published 17 Oct 2026 · 10:39 UTC

DeepSeek release notes ↗ · Source dated 17 Oct 2026

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