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DeepSeek · Open weights

DeepSeek V4.1 Flash

Added Sep 8, 2026Open weights

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Use in the app

DeepSeek V4.1 Flash supports text and image input, reasoning, tool calling, and structured output with a 1M-token context window. This is a rate-limited beta with limited capacity, intended for testing rather than production use.

  • Reasoning
  • Tools
  • Vision
  • Structured output
Input
Text, Images
Output
Text
Reasoning effort
none · low · high · max
Discovery tier
Open weights

Pricing

USD per 1M tokens
Input
$0.09
Output
$0.25
Cache read
$0.006

Reference prices as published by the model provider. API example

Specifications

Context window
1M
Max output
384K
Average output (7 days)
376 tokens
Longer than 38% of 465 models

Side by side

DeepSeek V4.1 Flash compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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DeepSeek V4.1 FlashDeepSeekThis modelClaude Sonnet 4.6AnthropicRemove
ProviderDeepSeekAnthropic
Discovery tierOpen weightsFrontier
AddedSep 8, 2026Feb 17, 2026
Limits
Context window1M1M
Max output384KBest128K
Average output376 tokens401 tokens
Pricing, USD per 1M tokens
Input$0.09Best$3.00
Output$0.25Best$15.00
Cache read$0.006Best$0.30
Performance
Throughput206.3 tok/sBest79.9 tok/s
Time to first token1.8 s1.6 sBest
Request success (24h)99.8%Best99.6%
Benchmark indexes
Intelligence Index24.724.7
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputYesYes
PDF inputNoYes
Reasoning effortnone, low, high, maxlow, medium, high, xhigh, max

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • DeepSeek V4.1 Flash
  • Claude Sonnet 4.6

Intelligence Index

  • DeepSeek V4.1 Flash24.7
  • Claude Sonnet 4.624.7

DeepSeek V4.1 Flash: Better than 60% of 326 scored models

3.8Catalog models by score55.1

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • DeepSeek V4.1 Flash: 47.8%
    • Claude Sonnet 4.6: —

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • DeepSeek V4.1 Flash: 14.2%
    • Claude Sonnet 4.6: —

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • DeepSeek V4.1 Flash: 1,118 Elo
    • Claude Sonnet 4.6: —

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • DeepSeek V4.1 Flash: 1,340 Elo
    • Claude Sonnet 4.6: —

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • DeepSeek V4.1 Flash: 3.8%
    • Claude Sonnet 4.6: —

  • AA-LCRv1.1

    Reasoning across long documents

    • DeepSeek V4.1 Flash: 55.3%
    • Claude Sonnet 4.6: 68.3%Top

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • DeepSeek V4.1 Flash: 10.8%
    • Claude Sonnet 4.6: 13.3%Top

  • GPQA Diamond

    Graduate-level science questions

    • DeepSeek V4.1 Flash: —
    • Claude Sonnet 4.6: 79.9%

  • IFBench

    Following precise output instructions

    • DeepSeek V4.1 Flash: —
    • Claude Sonnet 4.6: 41.2%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • DeepSeek V4.1 Flash: 5.6%
    • Claude Sonnet 4.6: —

  • SciCode

    Scientific computing in Python

    • DeepSeek V4.1 Flash: 35.5%
    • Claude Sonnet 4.6: —

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • DeepSeek V4.1 Flash: —
    • Claude Sonnet 4.6: 46.2%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • DeepSeek V4.1 Flash: —
    • Claude Sonnet 4.6: 79.5%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • DeepSeek V4.1 Flash: 55.3%
    • Claude Sonnet 4.6: 68.3%Top

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Throughput
206.3 tok/s
Faster than 83% of 250 models
Time to first token
1.8 s
Quicker than 84% of 250 models
Prompt cache hits
86.7%
About $0.0172 per 1M input tokens with caching
Request success (24h)
99.8%
Reliable

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Hourly request success · last 72 hoursLowest hour 98.6%
  • Healthy (98% or more)
  • Degraded (90–98%)
  • Down (under 90%)
  • No requests

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek/deepseek-v4.1-flash",
    "reasoning_effort": "none",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="deepseek/deepseek-v4.1-flash",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

DeepSeek

Other DeepSeek models, starting with the same family.