DeepSeek: DeepSeek V3.1 Terminus
The DeepSeek V3.1 Terminus is a language model developed by deepseek that can process text inputs up to 163840 tokens in length and generate outputs of up to 32768 tokens. It supports text input modality only and has tools for reasoning capabilities, but its structured output capability is unspecified. This model's price point is $0.27 per million input tokens and $1.00 per million output tokens, making it a relatively affordable option. Its benchmark standing is notable, with a blended score of 20.5 across one independent benchmark. While the number of benchmarks is limited to one, the model's performance in this area suggests it may be worth considering for applications where text input and reasoning capabilities are required, especially at its price point.
Benchmark results
Independent, published benchmarks. Blended score 18.9 across 1 benchmark, last refreshed 2026-09-23. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 23.0 |
- Model ID
- deepseek/deepseek-v3.1-terminus
- Vendor
- deepseek
- Released
- September 2025
- Tokenizer
- DeepSeek
- Input Modalities
- text
- Output Modalities
- text
- Max Output
- 32,768 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- text only
- Audio
- no
- Moderated
- no
What it costs in practice
Computed from the current $0.27/M input and $1.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | under $0.01 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.18 |
| A month of a busy support chatbot | 5M in / 2M out | $3.35 |
Price & spec history
Tracked daily by PicksByModel since 2026-07-17.
| Date | Input /M | Output /M | Context |
|---|---|---|---|
| 2026-08-18 | $0.27 | $1.00 | 163,840 |
| 2026-08-12 | $0.27 | $0.95 | 163,840 |
| 2026-07-22 | $0.27 | $1.00 | 163,840 |
| 2026-07-17 | $0.27 | $1.00 | 131,072 |
Similar models
DeepSeek: DeepSeek V3.1
DeepSeek: DeepSeek V3.2
DeepSeek: DeepSeek V3.2 Exp
DeepSeek: R1 0528
DeepSeek: DeepSeek V4 Pro 0423
DeepSeek: DeepSeek V4 Pro 0813
Quick answers
- How much does DeepSeek: DeepSeek V3.1 Terminus cost?
- $0.27 per million input tokens and $1.00 per million output tokens.
- What is DeepSeek: DeepSeek V3.1 Terminus's context window?
- 163,840 tokens, roughly 245 pages of text in a single request.
- Does DeepSeek: DeepSeek V3.1 Terminus support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can DeepSeek: DeepSeek V3.1 Terminus process images?
- No, it is text-only on the input side.