DeepSeek · llm model
DeepSeek-V4.1-Flash
DeepSeek-V4.1-Flash is a DeepSeek language model released Sep 10, 2026; DeepSeek's newest language model in our dataset is DeepSeek-V4.1-Flash-1017. Open weights (MIT). DeepSeek's MIT-licensed V4.1 Flash model with a 1M-token context, released Sep 10, 2026 and updated to the 1017 version on Oct 17, 2026. Verified against vendor sources on Oct 26, 2026.
Reported Last verified · All models · JSON · Markdown
- ReleasedSep 10, 2026
- Context window1M1,000,000 tokens
- Max output384K384,000 tokens
- LicenceOpen weightsMIT
InTextImageOutText
Key facts
| Fact | Value | Source |
|---|---|---|
| Vendor | DeepSeek | n/a |
| Released | Sep 10, 2026 V4.1-Flash release; the DeepSeek-V4.1-Flash-1017 update followed on 2026-10-17. | source |
| Latest update | Oct 17, 2026 | source |
| Status | generally available | n/a |
| API id | deepseek-flash | source |
| Context window | 1,000,000 tokens (1M) | source |
| Max output | 384,000 tokens | source |
| Input | text, image Native image understanding per DeepSeek's pricing page. | source |
| Output | text | source |
| Licence | MIT (open weights) License as listed on the Hugging Face model repository. | source |
| Pricing | ¥1 in / ¥4 out per 1M tokens; peak: ¥2 / ¥8 Official price list is in CNY. Off-peak shown; peak (Beijing time Mon-Fri 09-12 and 14-18) is double. We do not convert currencies because the USD table was not readable without JavaScript. | source |
Where DeepSeek-V4.1-Flash sits in our data
- Released Sep 10, 2026 (week 37 of 2026), in September 2026. Other models in our data released that month: GPT-6.1 Sol, Claude Sonnet 5.5, Claude Opus 5.5, Gemini 3.8 Flash TTS, Gemini 3.8 Flash-Lite TTS, GPT-6 Luna.
- Of the 60 models in our data with a published context window, DeepSeek-V4.1-Flash has the number 29 largest (1M tokens). Our data is not every model on the market.
- DeepSeek tools we cover: DeepSeek.
- All releases by date: AI model releases by month · new AI models this week. Choosing for code: best LLM for coding.
How DeepSeek-V4.1-Flash differs from DeepSeek-V4.1-Flash-1017
Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.
- Listed price is the same as DeepSeek-V4.1-Flash-1017: CNY 1 in and CNY 4 out (per 1M tokens).
- Both list a 1M-token context window.
- Both accept text, image as input.
- DeepSeek-V4.1-Flash came out 37 days before DeepSeek-V4.1-Flash-1017.
- Facts for the other model: DeepSeek-V4.1-Flash-1017.
Notes
- Superseded behind the deepseek-flash API name by DeepSeek-V4.1-Flash-1017 (Oct 17, 2026); see /models/deepseek-v4-1-flash-1017.
What we tested
Nothing yet. We have not run DeepSeek-V4.1-Flash ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.
Sources
More from DeepSeek
- DeepSeek-V4.1-Flash-1017 (Oct 17, 2026)