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DeepSeek-V3.1-Terminus

DeepSeek-V3.1-Terminus is an AI model made by DeepSeek AI. DeepSeek AI released it on 22 September 2025. It is retired.

In inglese

DeepSeek-V3.1-Terminus is an AI model made by DeepSeek AI. DeepSeek AI released it on 22 September 2025. It is retired. DeepSeek AI retired it on 15 October 2025. Its context window is 128,000 tokens. Its weights are open. Its licence is MIT License.

Released: 22 September 2025 — api-docs.deepseek.com, read 16 October 2026
Status: Retired — api-docs.deepseek.com, read 16 October 2026
Retired: 15 October 2025 — api-docs.deepseek.com, read 16 October 2026
Takes: Text — huggingface.co, read 16 October 2026
Returns: Not confirmed: not found on the maker’s own pages
Open weights: Yes — api-docs.deepseek.com, read 16 October 2026
Licence: MIT License — huggingface.co, read 16 October 2026
Context window: 128,000 tokens — api-docs.deepseek.com, read 16 October 2026
Longest answer: Not confirmed: The maker's pages reviewed do not state DeepSeek-V3.1-Terminus's standard maximum output-token limit.
Knowledge cutoff: Not confirmed: The maker's pages reviewed do not state a knowledge-cutoff date for this model.
API price, input: Not confirmed: The current maker pricing page does not list DeepSeek-V3.1-Terminus or a standard input price for it; the comparison-testing page only says its pricing was consistent with V3.2-Exp, without stating an amount.
API price, output: Not confirmed: The current maker pricing page does not list DeepSeek-V3.1-Terminus or a standard output price for it; the comparison-testing page only says its pricing was consistent with V3.2-Exp, without stating an amount.
Where: Not confirmed: two readings disagree: weights and api, app, weights
Parameters: 685,000,000,000 — huggingface.co, read 16 October 2026
Model card: https://huggingface.co/deepseek-ai/DeepSeek-V3.1-Terminus — huggingface.co, read 16 October 2026

Benchmarks

Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.

Arena

Text Arena, deepseek-v3.1-terminus-thinking: 1,416 (1,406–1,426, 3,375 votes), published 15 October 2026
Text Arena, deepseek-v3.1-terminus: 1,415 (1,405–1,424, 3,608 votes), published 15 October 2026

Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0

Questions

When was DeepSeek-V3.1-Terminus released?

DeepSeek AI released DeepSeek-V3.1-Terminus on 22 September 2025.

Is DeepSeek-V3.1-Terminus still available?

No: DeepSeek AI retired DeepSeek-V3.1-Terminus on 15 October 2025.

What is the context window of DeepSeek-V3.1-Terminus?

The context window of DeepSeek-V3.1-Terminus is 128,000 tokens, as DeepSeek AI prints it.

Are the weights of DeepSeek-V3.1-Terminus open?

Yes: DeepSeek AI publishes the weights of DeepSeek-V3.1-Terminus for download.

What is the licence of DeepSeek-V3.1-Terminus?

The licence of DeepSeek-V3.1-Terminus is MIT License, as DeepSeek AI names it.

How many parameters does DeepSeek-V3.1-Terminus have?

DeepSeek-V3.1-Terminus has 685,000,000,000 parameters, as DeepSeek AI publishes it.

Sources

Change Log (read 16 October 2026)
V3.1-Terminus Comparison Testing (read 16 October 2026)
deepseek-ai/DeepSeek-V3.1-Terminus (read 16 October 2026)
DeepSeek-V3.1 Release (read 16 October 2026)
DeepSeek-V3.1-Terminus (read 16 October 2026)
Models & Pricing (read 16 October 2026)

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