DeepSeek V4.1 Flash

Sep 2026
Older versionReplace withDeepSeek V4.1 Flash 1017Newer versionMiMo v2.6 ProCheaper, as goodGPT-6 LunaBetter
DeepSeek V4.1 Flash
Compare in
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$0.22per task?
$0.30 / $1.20per 1M in / out?
201 tok/sfirst token in 0.8 s?
1Mcontext

Rankingin non-thinking mode?

Retired models are left out of the current rankings.

Alternatives?

ModelScoreCostPer taskWhat changes
CheaperMiMo v2.6 ProthinkingOpen+88%-40%$0.13Pass back reasoning_content+3BetterGPT-6 Lunamedium+21%-92%$0.017Function calling only with none · Chat Completions+3CheaperGPT-6.1 Sollow+71%-41%$0.13Remove unsupported parameters+5CheaperClaude Haiku 5.5xhigh+67%-44%$0.12Remove sampling parameters+5CheaperMiMo v2.6 FlashthinkingOpen+54%-72%$0.062Pass back reasoning_content+3

Run it yourself

Fits onhardware needs not verified yet
Licencenot verified

History

4 versions
2530354045Jul 26Oct 26Release dateAA Intelligence Index 4.3.2V4 · AprV4 · JulV4.1 · SepV4.1 · Oct
2530354045Jul 26Oct 26Release dateAA Intelligence Index 4.3.2V4 · AprV4 · JulV4.1 · Sep

Benchmarks

all categories
Chat & Knowledge
Humanity's Last Exam10.8
AA Omniscience Index-10.2
CritPt (physics)0.3
AA Intelligence Index 4.3.224.7
AA Omniscience · Accuracy28.5
AA Omniscience · Hallucination Rate54
AA-LCR (long context) 1.155.3
GDP.pdf · AA all-pass3.8
Coding
Terminal-Bench 4.05.6
SciCode35.5
Agents & Tool Use
AutomationBench-AA47.8
GDPval-AA (work tasks) 2.142.1
AA-Briefcase 1.1 · Elo1,117.6
Vision & Documents
MMMU-Pro (vision)65.6

FAQ

How much does DeepSeek V4.1 Flash cost?›

$0.30 per 1M input tokens and $1.20 per 1M output tokens. A typical benchmark task costs about $0.22 at default effort.

Is DeepSeek V4.1 Flash free to use?›

There is no free API; the cheapest paid price is $0.30 per 1M input tokens. The weights are open, so you can run it yourself.

How can I use DeepSeek V4.1 Flash?›

Through the DeepSeek API.

What is the context window of DeepSeek V4.1 Flash?›

1M tokens.

When was DeepSeek V4.1 Flash released? Is there a newer version?›

Released 2026-09-10. It has been superseded by DeepSeek V4.1 Flash 1017.

Is DeepSeek V4.1 Flash open source?›

Yes, the weights are open.

Can I run DeepSeek V4.1 Flash locally?›

The weights are open and can be self-hosted; hardware needs are not confirmed yet.

What is DeepSeek V4.1 Flash?›

DeepSeek V4.1 Flash is an open-weights language model from DeepSeek, released Sep 2026, the successor to DeepSeek V4 Flash 0731.

What are the best alternatives to DeepSeek V4.1 Flash?›

MiMo v2.6 Pro (cheaper), GPT-6 Luna (better).