DeepSeek V3.1 Terminus
DeepSeek V3.1 Terminus is a reasoning model from DeepSeek released on Sep 22, 2025. It reads text and writes text, with a 164K token context window and up to 147K tokens per reply.
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It costs $0.27 per million input tokens and $1 per million output tokens.
It supports tool calling and structured JSON output.
3 providers serve it, including Helicone, Kilo Gateway and Qiniu.
- Modalities
- In / out price
- $0.27 / $1 per 1M
- Context
- 164K
- Max output
- 147K
- Released
- Sep 22, 2025
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
DeepSeek V3.1 Terminus pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.27 / 1M tokens | |
|---|---|---|
| Output | $1 / 1M tokens |
DeepSeek V3.1 Terminus providers
3 providers serve it, including Helicone, Kilo Gateway and Qiniu. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| Helicone | $0.27 | $1 | $0.216 | 128K | 16K |
| Kilo Gateway | $0.27 | $1 | – | 164K | 147K |
| Qiniu | n/a | n/a | – | 128K | 32K |
What DeepSeek V3.1 Terminus costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call DeepSeek V3.1 Terminus through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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DeepSeek V3.1 Terminus questions
How much does the DeepSeek V3.1 Terminus API cost?
$0.27 per million input tokens and $1 per million output tokens. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of DeepSeek V3.1 Terminus?
163,840 tokens of input, and it can write up to 147,456 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve DeepSeek V3.1 Terminus?
3 providers serve it, including Helicone, Kilo Gateway and Qiniu. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does DeepSeek V3.1 Terminus support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is DeepSeek V3.1 Terminus open source?
No. DeepSeek serves it through an API only, so you cannot download the weights or host it yourself.
When was DeepSeek V3.1 Terminus released?
Sep 22, 2025.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on DeepSeek V3.1 Terminus?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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