DeepSeek releases V4.1-Flash-1017 open-weight model under MIT license
The gist
DeepSeek released DeepSeek-V4.1-Flash-1017 as MIT-licensed open weights, scoring 77.0% on DeepSWE v1.1.
It beats Claude Opus 5 on that coding test but trails on Terminal-Bench.
How it unfolded
- Oct 17, 2026A bot account called AI Tracker Bot posted on X that it caught a new entry, deepseek-v4.1-flash-1017, in DeepSeek's API model list at 9:59 PM ET; the model name was rejected by the API minutes later.
- Oct 17, 2026Two DeepSeek users reported signs of a possible V4.1-Flash refresh in separate observations of the company's API.
- Oct 17, 2026DeepSeek released DeepSeek-V4.1-Flash-1017 as open weights under the MIT License, described in its model card as "a minor update" to V4.1 Flash.