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Step 5 Preview
DeepSeek-V3.1-Terminus
DeepSeek-V3.1-Terminus is an open-weight model from DeepSeek, released Sep 22, 2025. It ranks #119 of 351 on the LMArena text leaderboard with a rating of 1419. It costs $0.27 per million input tokens and $1 per million output tokens, with a 160K-token context window.
- Developer
- DeepSeek
- Released
- Sep 22, 2025
- Context window
- 160K
- Price in / out, per 1M tokens
- $0.27 / $1
- Weights
- Open · MIT
- Inputs
- Text
- Reasoning
- Yes
- Tool use
- Yes
- Hugging Face downloads, 30 days
- 13K
- Hugging Face likes
- 385
The rating LMArena published at each update since Sep 30, 2025. Ratings move as votes come in and new models join.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1419 | 119 / 351 | 3.4K |
| CodingLMArena | 1425 | 145 / 346 | 632 |
| MathLMArena | 1402 | 160 / 339 | 216 |
| Creative writingLMArena | 1403 | 91 / 349 | 446 |
| Instruction followingLMArena | 1404 | 120 / 351 | 859 |
| Hard promptsLMArena | 1426 | 122 / 351 | 1.7K |
| Multi-turnLMArena | 1411 | 137 / 349 | 571 |
| Long queriesLMArena | 1423 | 105 / 330 | 676 |
| Legal and governmentIndustries | 1458 | 57 / 325 | 258 |
| Medicine and healthcareIndustries | 1468 | 42 / 325 | 227 |
| Business and financeIndustries | 1416 | 111 / 344 | 690 |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown (DeepSeek-V3.1-Terminus (Thinking), DeepSeek-V3.1-Terminus).
Compare DeepSeek-V3.1-Terminus
DeepSeek
A research lab known for strong open-weight reasoning and coding models trained at low cost. Founded 2023, based in Hangzhou. deepseek.com
Questions
Who makes DeepSeek-V3.1-Terminus?
DeepSeek-V3.1-Terminus is made by DeepSeek, founded 2023 and based in Hangzhou.
How much does DeepSeek-V3.1-Terminus cost?
$0.27 per million input tokens and $1 per million output tokens, at its provider’s list price.
What is DeepSeek-V3.1-Terminus’s context window?
160K tokens (163,840).
How does DeepSeek-V3.1-Terminus rank?
#119 of 351 on LMArena’s text leaderboard, rated 1419 (95% interval 1409–1429) from 3,375 votes, as of Oct 22, 2026.
Is DeepSeek-V3.1-Terminus open source?
DeepSeek-V3.1-Terminus has open weights under the MIT license, downloadable from Hugging Face (deepseek-ai/DeepSeek-V3.1-Terminus).