DeepSeek-V4.1-Flash-1017 at a glance.
From DeepSeek's own pages, read Oct 20, 2026, so company-reported. A token is a word or part of a word. Prices can change; check the maker's page before you build on them.
- Made by
- DeepSeekBased in China
- Released
- Oct 17, 2026DeepSeek API docs news: 'DeepSeek-V4.1-Flash-1017: Wish-Driven Programming Made Real'
- What it is for
- “Stronger benchmark performance, faster task completion, and shorter outputs than the previous version.”DeepSeek API docs news: 'DeepSeek-V4.1-Flash-1017: Wish-Driven Programming Made Real', Oct 17, 2026 · in DeepSeek's words
- Reads at once
- 1M tokensIts context window: how much text it can take in one go
- Takes in
- text, image
- Download
- Yes, open weightsLicense: MIT
- Size
- 552B backbone parameters parameters, 8B per token during prefill, 16B during decode activeHugging Face model card deepseek-ai/DeepSeek-V4.1-Flash, Oct 20, 2026
$0.30per million tokens in$1.20per million tokens out
Peak-hours price
API name deepseek-flash. Peak prices shown (input = cache miss). Off-peak rates are half: $0.15 in / $0.60 out. Cache-hit input $0.006 peak / $0.003 off-peak. Peak hours 01:00-04:00 and 06:00-10:00 UTC, Monday-Friday, excluding Chinese public holidays.
DeepSeek API docs: Models & Pricing, Oct 20, 2026 · company-reported
Where it ranks.
Its position on each of the 21 tests the models page uses, by testers other than the maker. Epoch AI's and Vectara's scores are shown under their open licenses; for LMArena, Scale and Vals we give the position and link to their own leaderboard. Each list is a snapshot with its date.
| Test | Rank | Score |
|---|---|---|
| Epoch Capabilities IndexEpoch AI, Oct 20, 2026 | Not in the top 30 | |
| Vals IndexVals AI, Oct 19, 2026 | #8 | On Vals AI |
| Test | Rank | Score |
|---|---|---|
| LMArena WebDevLMArena, Oct 19, 2026 | Not in the top 20 | |
| SWE-Bench ProScale AI, Sep 22, 2026 | Not in the top 16 | |
| Vibe Code BenchVals AI, Oct 18, 2026 | #11 | On Vals AI |
| LMArena coding chatsLMArena, Oct 15, 2026 | Not in the top 20 |
| Test | Rank | Score |
|---|---|---|
| LMArena textLMArena, Oct 15, 2026 | Not in the top 20 | |
| LMArena creative writingLMArena, Oct 15, 2026 | Not in the top 20 | |
| MultiChallengeScale AI, Feb 3, 2026 | Not in the top 15 |
| Test | Rank | Score |
|---|---|---|
| LMArena Agent ArenaLMArena, Oct 19, 2026 | Not in the top 20 | |
| Remote Labor IndexScale AI | Not in the top 16 | |
| Terminal-Bench 4.0Vals AI, Oct 19, 2026 | #17 | On Vals AI |
| CUA-bench (games)Vals AI, Oct 13, 2026 | Not in the top 9 |
| Test | Rank | Score |
|---|---|---|
| LMArena mathLMArena, Oct 15, 2026 | Not in the top 20 | |
| Humanity's Last ExamScale AI | Not in the top 17 | |
| ProofBenchVals AI, Oct 12, 2026 | Not in the top 20 |
| Test | Rank | Score |
|---|---|---|
| LMArena visionLMArena, Oct 19, 2026 | Not in the top 20 | |
| LMArena documentsLMArena, Sep 13, 2026 | Not in the top 20 |
| Test | Rank | Score |
|---|---|---|
| GPQA DiamondVals AI, Sep 1, 2026 | Not in the top 20 | |
| MMMU ProVals AI, Sep 1, 2026 | Not in the top 20 |
| Test | Rank | Score |
|---|---|---|
| Vectara hallucination testVectara, Oct 16, 2026 | Not in our copy of the list |
“Not in the top” means it isn't among the models in our copy of that list, which runs to the position shown; it may not have been tested. Vectara's test ranks by how rarely a model adds facts, so lower is better. Positions can be shared when scores tie. Epoch's range is its margin of uncertainty. Epoch AI and Vectara data: CC BY 4.0 and Apache-2.0.
Our note: Max output 384K; pricing page marks Vision 'Supported'. Weights URL is the one linked from DeepSeek's 2026-10-17 release note. Parameter counts and MIT license are from the earlier DeepSeek-V4.1-Flash card (repo created 2026-09-10); the 1017 card itself was not read, and the release note names no license. The 1017 release note says the model targets agentic coding and whole-project building.