DeepSeek V3.1 Terminus

DeepSeek V3.1 Terminus by DeepSeek excels in the Coding category, where it ranks #99 with a composite score of 77/100. DeepSeek-V3.1 Terminus is an update to [DeepSeek V3.1](/deepseek/deepseek-chat-v3.1) that maintains the model's original capabilities while addressing issues reported by users, including language consistency and agent capabilities, further optimizing the model's performance in coding and search agents. It is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes. It extends the DeepSeek-V3 base with a two-phase long-context training process, reaching up to 128K tokens, and uses FP8 microscaling for efficient inference. Users can control the reasoning behaviour with the `reasoning` `enabled` boolean. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#enable-reasoning-with-default-config) The model improves tool use, code generation, and reasoning efficiency, achieving performance comparable to DeepSeek-R1 on difficult benchmarks while responding more quickly. It supports structured tool calling, code agents, and search agents, making it suitable for research, coding, and agentic workflows. It is particularly strong in areas highlighted by its top benchmark performance and adoption metrics, making it suitable for both individual developers and enterprise teams looking for a reliable coding solution.

DeepSeek V3.1 Terminus is priced at $0.21 per million input tokens and $0.78 per million output tokens (USD). Contact the provider for volume discounts and enterprise pricing. Pricing is competitive within the coding category and reflects the model's quality-to-cost ratio.

In the Coding category, DeepSeek V3.1 Terminus holds rank #99 out of 6 models tracked. Its quality rank is #99 and adoption rank is #99. You can use our comparison tool at /compare to see detailed side-by-side metrics with specific alternatives. Key differentiators include its composite scoring across benchmarks, community sentiment, and real-world adoption rates.

DeepSeek V3.1 Terminus has been evaluated across 6 different signals. Its strongest areas include Capabilities (67/100), Benchmarks (69/100), Pricing (1/100). These scores are derived from industry-standard benchmarks, community ratings, and real-world performance metrics. The composite score of 77/100 reflects a weighted combination of all tracked signals.

DeepSeek V3.1 Terminus is a paid model, though some providers may offer trial credits or limited free tiers for evaluation. Check DeepSeek's website for current free tier availability and promotional offers.