DeepSeek-V4.1-Flash-1017 Lifts DeepSWE Score to 77%, Opens Search APIs

DeepSeek’s latest Flash model raised its DeepSWE v1.1 score to 77% and opened Search and Fetch APIs to developers, adding new coding capabilities and paid web-search access.

DeepSeek-V4.1-Flash-1017 is available through the company’s website, app and API. Its DeepSWE v1.1 Pass@1 score rose to 77.0% from 74.2% for the September version. Its Terminal-Bench 4.0 score increased to 42.3% from 31.2%.

Demonstrations of the update included a 3D Forbidden City scene, a browser-based racing game and a recreation of Portal 2 built with the Godot engine.

The Search API lets developers find web pages, while Fetch retrieves page content. Each endpoint costs $0.75 per 1,000 successful requests. Calls through server-side tools in DeepSeek Harness, Claude Code and Codex are free for DeepSeek API users until billing begins at noon ET (16:00 UTC) Oct. 31.