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DeepSeek-V4.1-Flash

DeepSeek · Fast & cheap · Sep 10, 2026NewOpen weights

DeepSeek's newest model and the first on its new architecture: open weights, built-in vision, fast output and very low prices.

Announcement (opens in a new tab)
Artificial Analysis Intelligence Index
39.5#17 of 29 · max effort
API price per 1M tokens
$0.30 / $1.20input / output · $0.52 blended
Context window
1Mup to 384K output tokens
Output speed
216 t/s10s to first answer at max effort

Benchmark results

Each row shows this model (blue) against every other model in the catalogue (grey), worst on the left, best on the right.

Overall capability

  • Artificial Analysis Intelligence Index39.5#17 of 29

    Max effort

    11.357.6
  • Epoch Capabilities Index154.9#13 of 16
    146.9167.3
  • LiveBench81.1%#6 of 23

    Max effort

    63.9%83.4%

Coding

  • Arena WebDev1,619#14 of 27

    Max effort

    1,2631,814

Agents & professional work

  • GDPval-AA1,600#12 of 18

    Max effort

    1,2421,866

Reasoning

  • ARC-AGI-272.9%#6 of 11

    Max effort

    42.4%95%
  • MathArena43.3%#9 of 10

    Max effort

    35.3%90.1%
  • SimpleBench66.7%#9 of 12
    45.8%88.4%

Human preference

  • Arena Text1,474#13 of 24

    Max effort

    1,4251,525

Reasoning effort trade-offs

The same model at different thinking budgets. More effort buys a higher intelligence score at a higher cost per task and a longer wait. Measured by Artificial Analysis.

EffortScoreCost / taskFirst answerSpeed
No reasoning
24.7
$0.151.1s219 t/s
Max (headline score)
39.5
$0.2710s216 t/s

Specs & pricing

Developer
DeepSeek
Released
Sep 10, 2026
Availability
Generally available
API model ID
deepseek-flash
Weights
Open · MIT
Parameters
552B (MoE)
Reasoning
Adjustable effort
Accepts
Text, Image
Produces
Text
Context window
1,000,000 tokens
Max output
384,000 tokens
Input price
$0.30 / 1M tokens
Output price
$1.20 / 1M tokens
Cached input
$0.006 / 1M tokens

Peak-hour rates. DeepSeek charges half these prices off-peak, which covers most hours of the week.

Closest alternatives

Models from other labs nearest to DeepSeek-V4.1-Flash on Artificial Analysis Intelligence Index.

  • Qwen3.8-Flash-Next

    Alibaba

    Intelligence 39.8 · $0.15 / $0.47

    Compare side by side

  • Mistral Large 4

    Mistral AI

    Intelligence 38.4 · $1.36 / $4.18

    Compare side by side

  • GPT-6 Luna

    OpenAI

    Intelligence 38.1 · $0.10 / $0.50

    Compare side by side

Sources

  • Announcement (opens in a new tab)
  • Model documentation (opens in a new tab)
  • Pricing (opens in a new tab)
Yardstick

A plain reading of how today’s SI models compare. Scores are taken from each benchmark’s own leaderboard wherever one exists; anything a lab reported about its own model is marked.

Data as of Oct 8, 2026.

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Sources

  • Artificial Analysis (opens in a new tab)
  • Arena (opens in a new tab)
  • Epoch AI Benchmarking Hub (opens in a new tab)
  • ARC Prize (opens in a new tab)
  • Terminal-Bench (opens in a new tab)
  • Scale AI Labs (opens in a new tab)

Yardstick is an independent reference and is not affiliated with, sponsored by or endorsed by any lab listed. Product names and logos are trademarks of their respective owners and are used only to identify them. Benchmarks are imperfect proxies: check a model on your own task before you commit to it.

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