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DeepSeek · Open weights

DeepSeek V4.1 Flash 1017

Added Oct 17, 2026Open weights

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Use in the app

The October 17, 2026 snapshot of DeepSeek V4.1 Flash supports text and image input, tool calling, and optional reasoning with low, high, and max effort. It has a shared 1,048,576-token context window and supports up to 393,216 output tokens within the remaining context. Released under the MIT license.

  • 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
$0.10
Output
$0.60
Cache read
$0.003

Reference prices as published by the model provider. API example

Specifications

Context window
1M
Max output
393.2K
Average output (7 days)
465 tokens
Longer than 46% of 465 models

Side by side

DeepSeek V4.1 Flash 1017 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 Flash 1017DeepSeekThis modelDeepSeek V4 Flash 0423DeepSeekRemove
ProviderDeepSeekDeepSeek
Discovery tierOpen weightsOpen weights
AddedOct 17, 2026Oct 7, 2026
Limits
Context window1.05M1.05M
Max output393.22K—
Average output465 tokens245 tokens
Pricing, USD per 1M tokens
Input$0.10Best$0.14
Output$0.60$0.28Best
Cache read$0.003Best$0.028
Performance
Throughput154.0 tok/sBest131.1 tok/s
Time to first token2.2 s2.0 sBest
Request success (24h)99.7%Best98.3%
Benchmark indexes
Intelligence Index24.7Best18.9
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesNo
Structured outputYesYes
Reasoning effortnone, low, high, maxnone, low, high, max

Public evaluations

Benchmarks

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

  • DeepSeek V4.1 Flash 1017
  • DeepSeek V4 Flash 0423

Intelligence Index

  • DeepSeek V4.1 Flash 101724.7
  • DeepSeek V4 Flash 042318.9

DeepSeek V4.1 Flash 1017: 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 1017: 47.8%
    • DeepSeek V4 Flash 0423: —

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • DeepSeek V4.1 Flash 1017: 14.2%
    • DeepSeek V4 Flash 0423: —

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • DeepSeek V4.1 Flash 1017: 1,118 Elo
    • DeepSeek V4 Flash 0423: —

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • DeepSeek V4.1 Flash 1017: 1,340 Elo
    • DeepSeek V4 Flash 0423: —

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • DeepSeek V4.1 Flash 1017: 3.8%
    • DeepSeek V4 Flash 0423: —

  • AA-LCRv1.1

    Reasoning across long documents

    • DeepSeek V4.1 Flash 1017: 55.3%Top
    • DeepSeek V4 Flash 0423: 41.7%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • DeepSeek V4.1 Flash 1017: 10.8%Top
    • DeepSeek V4 Flash 0423: 7.8%

  • GPQA Diamond

    Graduate-level science questions

    • DeepSeek V4.1 Flash 1017: —
    • DeepSeek V4 Flash 0423: 71.6%

  • IFBench

    Following precise output instructions

    • DeepSeek V4.1 Flash 1017: —
    • DeepSeek V4 Flash 0423: 47.2%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • DeepSeek V4.1 Flash 1017: 5.6%
    • DeepSeek V4 Flash 0423: —

  • SciCode

    Scientific computing in Python

    • DeepSeek V4.1 Flash 1017: 35.5%
    • DeepSeek V4 Flash 0423: —

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • DeepSeek V4.1 Flash 1017: —
    • DeepSeek V4 Flash 0423: 34.1%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • DeepSeek V4.1 Flash 1017: —
    • DeepSeek V4 Flash 0423: 94.4%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • DeepSeek V4.1 Flash 1017: 55.3%Top
    • DeepSeek V4 Flash 0423: 41.7%

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
154.0 tok/s
Faster than 76% of 250 models
Time to first token
2.2 s
Quicker than 74% of 250 models
Prompt cache hits
87.0%
About $0.0156 per 1M input tokens with caching
Request success (24h)
99.7%
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 98.5%
  • 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-1017",
    "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-1017",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

DeepSeek

Other DeepSeek models, starting with the same family.