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DeepSeek V4.1 Flash

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DeepSeek-V4.1-Flash-1017, open weights by DeepSeek

Tops our lineup on DeepSWE, matches GLM 5.3 on the Intelligence Index, runs fast, and reads images: our pick for everyday agentic coding. If a very long run loops or a tool call fails, restart the run; for the hardest long-horizon tasks, use GLM 5.3.

Get an API keyLive status
Price per 1M tokens
$0.15 in$0.60 out
$0.028 cache read
Context
1M
384K max output
Weights
FP8
On Hugging Face
  • Vision
  • Tool calling
  • Reasoning optional, default high

How it ranks

Against every model we serve, best first. About the scores

Artificial Analysis Intelligence Index v5by Artificial Analysis
  1. Kimi K3.1 Pro46
  2. DeepSeek V4.1 Flash33
  3. GLM 5.332

Not ranked, reported on another version: Kimi K3 (Intelligence v4.3: 44).

DeepSWEby Datacurve
  1. DeepSeek V4.1 Flash77%
  2. Kimi K3.1 Pro75.5%
  3. GLM 5.369%
  4. Kimi K368.5%
Terminal-Bench 4.0by tbench.ai
  1. Kimi K3.1 Pro67.2%
  2. DeepSeek V4.1 Flash42.3%
  3. GLM 5.341.9%

Not ranked, reported on another version: Kimi K3 (Terminal-Bench 2.1: 85%).

  • Artificial Analysis Intelligence Index v5 for DeepSeek V4.1 Flash: independent measurement. Source
  • DeepSWE for DeepSeek V4.1 Flash: reported by the publisher on its model card. Source
  • Terminal-Bench 4.0 for DeepSeek V4.1 Flash: reported by the publisher on its model card. Source

Pricing

Input
$0.15 per 1M tokens
Output
$0.60 per 1M tokens
Cache read
$0.028 per 1M tokens

See all prices

Specs

Context window
1M tokens
Max output
384K tokens
Vision
Yes
Tool calling
Yes
Reasoning
Adjustable (none, low, high, max)
Default effort
high
Weights
FP8 on Hugging Face
In production since
September 18, 2026

Quickstart

Pick your tool; the command already carries this model's id. More tools (Pi, Copilot, Zed, omp) in the setup guides.

OpenCode
Built in
Launch OpenCode on this model with the umans CLI. Umans AI is also built into OpenCode: run /connect and pick it.
Terminal
curl -fsSL https://api.code.umans.ai/cli/install.sh | bash   # once
umans opencode --model umans-deepseek-v4.1-flash
Full setup in the docs

Or consider

DeepSeek V4.1 Flash API: pricing, context and benchmarks · Umans AI