DeepSeek: DeepSeek V3.1 Terminus
DeepSeek V3.1 Terminus is designed for handling long text inputs with a context length of 163,840 tokens and supports both tool usage and reasoning capabilities. It processes only text inputs but offers no structured output or open-source model weights. With its comprehensive tools and reasoning support, it excels in complex tasks requiring multiple-step logical thinking. Given its blended benchmark score of 34.1 across a single independent test, DeepSeek V3.1 Terminus is suitable for users who need robust tool integration and reasoning abilities. However, the pricing at $0.27 per million input tokens and $1.0 per million output tokens might be a consideration; it’s competitive within its benchmark performance but may not be the most cost-effective option depending on your specific needs.
Benchmark results
Independent, published benchmarks. Blended score 34.1 across 1 benchmark, last refreshed 2026-07-29. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 35.3 |
- 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 |
|---|---|---|---|
| 2026-07-22 | $0.27 | $1.00 | 163,840 |
| 2026-07-17 | $0.27 | $1.00 | 131,072 |
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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.