DeepSeek · Released Oct 17, 2026DeepSeek V4.1 Flash 1017
October 17 update of DeepSeek V4.1 Flash with improved reasoning, coding, agentic tasks, and visual understanding.
- Capability
- 158.8ECI · #19 of 165
- Input
- $0.15per 1M tokens
- Output
- $0.60per 1M tokens
- Context
- 1M384K max output
What it costs
- Input
- $0.15per million tokens
- Output
- $0.60per million tokens
- Cached input
- $0.003per million tokens
- Blended (3:1)
- $0.263cheaper than 72% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $0.60 |
| Team assistant25M input + 5M output tokens | $6.75 |
| Production app250M input + 50M output tokens | $67.50 |
Official DeepSeek API price, as listed on models.dev.
Independent benchmarks
#19 of 165 scored models
The shaded band is Epoch AI’s confidence range (156.7–162.2); the tick marks the median scored model.
Scores from Epoch AI, run independently of DeepSeek.
The details
- Lab
- DeepSeek
- Released
- Oct 17, 2026
- Knowledge cutoff
- May 2025
- Context window
- 1,000,000 tokens
- Max output
- 384,000 tokens
- Inputs
- Text, Images
- Output
- Text
- Reasoning
- Adjustable effort low · high · max
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Open weights · MIT
- API model ID
deepseek-flashon DeepSeek- Availability
- 40 API providerslisted on models.dev
What DeepSeek claims
Published by the lab at launch. Settings vary, so compare these only with care.
| Benchmark | Score | Setting | Source |
|---|---|---|---|
| Humanity's Last Exam | 42.6 | without tools | Source |
| Humanity's Last Exam | 44 | without tools | Source |
| Terminal-Bench v4.0 | 42.3 | — | Source |
| DeepSWE v1.1 | 77 | — | Source |
| ProgramBench | 29.1 | — | Source |
| NL2Repo | 68.2 | — | Source |
| AutomationBench v1.0.6 | 60.5 | — | Source |
| Agents' Last Exam | 35.4 | — | Source |
| Apex Bench v1.1 | 72.1 | — | Source |
| Chartography | 83 | with tools | Source |
| BabyVision | 92.5 | with tools | Source |
| ZeroBench | 51 | with tools | Source |
More from DeepSeek
About DeepSeek V4.1 Flash 1017
How much does DeepSeek V4.1 Flash 1017 cost?
DeepSeek V4.1 Flash 1017 costs $0.15 input / $0.60 output per million tokens (official DeepSeek API price). Cached input is $0.003 per million tokens. At a 3:1 input-to-output mix that is $0.263 per million tokens, cheaper than 72% of the 445 priced models we track.
What is the context window of DeepSeek V4.1 Flash 1017?
DeepSeek V4.1 Flash 1017 accepts up to 1,000,000 tokens per request and can write up to 384,000 tokens in one response.
How good is DeepSeek V4.1 Flash 1017?
Epoch AI gives DeepSeek V4.1 Flash 1017 a Capabilities Index score of 158.8 (likely range 156.7–162.2), ranking it #19 of 165 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 93.2%, FrontierMath Tiers 1–3 71.2%, OTIS Mock AIME 2024–2025 99.4%, SimpleQA Verified 42.5%.
Is DeepSeek V4.1 Flash 1017 open source?
Yes. DeepSeek publishes the weights under the MIT licence, so it can be downloaded and self-hosted.
What inputs does DeepSeek V4.1 Flash 1017 support?
DeepSeek V4.1 Flash 1017 accepts text and images and replies in text. It is a reasoning model with low, high and max effort settings, supports tool calling and can return structured JSON output.
When was DeepSeek V4.1 Flash 1017 released?
DeepSeek released DeepSeek V4.1 Flash 1017 on Oct 17, 2026. Its training data runs to May 2025.
What are the best alternatives to DeepSeek V4.1 Flash 1017?
The closest current models from other labs on capability, price and release date are Claude Haiku 5.5 (Anthropic, ECI 160.4, $0.10 / $0.50), GPT-6 Luna (OpenAI, ECI 156.8, $0.10 / $0.50), GLM-5.3-Flash (Z.ai (Zhipu), ECI 153.2, $0.15 / $0.50) and Gemini 3.7 Flash (Google, ECI 158.2, $0.75 / $3.75).