DeepSeek · Released Aug 21, 2025DeepSeek-V3.1
Hybrid-reasoning DeepSeek model with thinking and non-thinking modes.
- Capability
- 139.9ECI · #100 of 148
- Input
- $0.385per 1M tokens
- Output
- $1.25per 1M tokens
- Context
- 131K8K max output
What it costs
- Input
- $0.385per million tokens
- Output
- $1.25per million tokens
- Blended (3:1)
- $0.601cheaper than 56% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $1.40 |
| Team assistant25M input + 5M output tokens | $15.88 |
| Production app250M input + 50M output tokens | $158.75 |
Median of 8 paid API providers on models.dev.
Independent benchmarks
#100 of 148 scored models
The shaded band is Epoch AI’s confidence range (136.1–143.3); the tick marks the median scored model.
Scores from Epoch AI, run independently of DeepSeek.
The details
- Lab
- DeepSeek
- Released
- Aug 21, 2025
- Context window
- 131,072 tokens
- Max output
- 8,192 tokens
- Inputs
- Text
- Output
- Text
- Reasoning
- Always on
- Tool calling
- Yes
- Structured output
- No
- Weights
- Open weights · MIT License
- Availability
- 8 API providerslisted on models.dev
More from DeepSeek
About DeepSeek-V3.1
How much does DeepSeek-V3.1 cost?
DeepSeek-V3.1 costs $0.385 input / $1.25 output per million tokens (median across 8 API providers). At a 3:1 input-to-output mix that is $0.601 per million tokens, cheaper than 56% of the 360 priced models we track.
What is the context window of DeepSeek-V3.1?
DeepSeek-V3.1 accepts up to 131,072 tokens per request and can write up to 8,192 tokens in one response.
How good is DeepSeek-V3.1?
Epoch AI gives DeepSeek-V3.1 a Capabilities Index score of 139.9 (likely range 136.1–143.3), ranking it #100 of 148 models Epoch has scored.
Is DeepSeek-V3.1 open source?
Yes. DeepSeek publishes the weights under the MIT License licence, so it can be downloaded and self-hosted.
What inputs does DeepSeek-V3.1 support?
DeepSeek-V3.1 accepts text and replies in text. It is a reasoning model, supports tool calling.
When was DeepSeek-V3.1 released?
DeepSeek released DeepSeek-V3.1 on Aug 21, 2025.
What are the best alternatives to DeepSeek-V3.1?
The closest current models from other labs on capability, price and release date are Qwen3 14B (Alibaba (Qwen), ECI 138.2, $0.35 / $1.40), Gemini 2.5 Flash (Google, ECI 140.8, $0.30 / $2.50), GPT OSS 120B (OpenAI, ECI 140.0, $0.15 / $0.60) and GLM-4.7 (Z.ai (Zhipu), ECI 143.5, $0.60 / $2.20).