DeepSeek V3.1 Terminus (Reasoning)
DeepSeek • text#230 of 616 in intelligence
Specifications
Context Window
—
Input Price/1M
$1.64
#597 of 744
Output Price/1M
$2.75
Parameters
—
Cost per Task
8.0
AA Score / US$ · higher = better
Benchmarks
DeepSeek V3.1 Terminus (Reasoning) results on the main AI model evaluation benchmarks. Higher scores indicate better performance.
Coding
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| AA Coding Index | 43.5 | 100.0 | Artificial Analysis official API |
overall
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| AA Intelligence Index | 15.4 | 100.0 | Artificial Analysis official API |
Information
- Release date
- September 22, 2025
- Tool Calling
- ❌ Not supported
- Vision
- ❌ Not supported
- Audio
- ❌ Not supported
Full Analysis: DeepSeek V3.1 Terminus (Reasoning)
What is DeepSeek V3.1 Terminus (Reasoning)?
DeepSeek V3.1 Terminus (Reasoning) is an AI model developed by DeepSeek, classified as a text model. It focuses on text processing and natural language generation. As a proprietary model, it is available via DeepSeek's cloud API.
Pricing & Costs in 2026
DeepSeek V3.1 Terminus (Reasoning) is usage-based, priced at $1.64/1M input tokens and $2.75/1M output tokens. For context: 1 million tokens is approximately 750,000 words, or about 10 average-length books. The mid-range pricing balances quality and cost for most professional applications.
Benchmarks & Performance
DeepSeek V3.1 Terminus (Reasoning) was evaluated on 2 different benchmarks, covering categories like Coding, overall. Results show moderate performance across available evaluations.
It's important to note that benchmarks measure specific aspects and don't capture the full user experience. Factors like instruction adherence, behavior in long conversations, and real-world task quality vary significantly between models and aren't always reflected in standard scores.
Recommended Use Cases
DeepSeek V3.1 Terminus (Reasoning) specializes in text, offering advanced capabilities for creating and processing text content.
Comparison with Alternatives
In the 2026 AI model ecosystem, DeepSeek V3.1 Terminus (Reasoning) competes directly with similarly capable models. DeepSeek competes in this segment against OpenAI, Anthropic, Google, and Meta. The choice between models depends on the specific use case, budget, latency requirements, and need for features like multimodality and tool calling.
For a detailed side-by-side comparison, use our comparison tool or check the overall model ranking.
Frequently Asked Questions
What is DeepSeek V3.1 Terminus (Reasoning)?
DeepSeek V3.1 Terminus (Reasoning) is an AI model developed by DeepSeek. It is a text model.
How much does DeepSeek V3.1 Terminus (Reasoning) cost?
DeepSeek V3.1 Terminus (Reasoning) costs $1.64/1M input tokens and $2.75/1M output tokens. For heavy usage (e.g., a chatbot handling 100k messages/month), costs can range from $10 to $1,000 depending on volume.
How does DeepSeek V3.1 Terminus (Reasoning) compare with other models?
In available benchmarks, DeepSeek V3.1 Terminus (Reasoning) scored: AA Coding Index: 43.5/100, AA Intelligence Index: 15.4/100. See the full table above for a detailed comparison.
Is DeepSeek V3.1 Terminus (Reasoning) open source?
No, DeepSeek V3.1 Terminus (Reasoning) is a proprietary model from DeepSeek. It is available via cloud API. For open source alternatives, check our open source model ranking.
What is DeepSeek V3.1 Terminus (Reasoning) best for?
DeepSeek V3.1 Terminus (Reasoning) excels at general-purpose language tasks.
Last updated: September 12, 2026 • View methodology →