DeepSeek-V4.1-Flash-1017: release report
DeepSeek released DeepSeek-V4.1-Flash-1017 on October 17, 2026. Specs and price, with more added as evidence arrives.
The release
DeepSeek released DeepSeek-V4.1-Flash-1017 on October 17, 2026. Read the announcement.
- Takes unknown. Returns unknown.
- Not a reasoning model.
- Closed weights.
DeepSeek's release before this was DeepSeek V4.1 Flash on September 10, 2026, 37 days earlier. Over the past year it has shipped a model every 28.5 days on median (9 releases).
Price
Added October 18, 2026.
$0.15 per million input tokens and $0.60 per million output tokens on OpenRouter. Cached input is $0.003.
Each section was written on the date shown and is not revised afterwards. Specifications from Models.dev, prices from provider listings, capability scores from Epoch AI under CC BY 4.0, chess and sudoku results from Model Cadence Bench.