DeepSeek V3.1

DeepSeek V3.1 by DeepSeek excels in the Coding category, where it ranks #125 with a composite score of 74/100. DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. 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 succeeds the [DeepSeek V3-0324](/deepseek/deepseek-chat-v3-0324) model and performs well on a variety of tasks. 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 is priced at $0.15 per million input tokens and $0.75 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 holds rank #125 out of 6 models tracked. Its quality rank is #125 and adoption rank is #125. 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 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 74/100 reflects a weighted combination of all tracked signals.

DeepSeek V3.1 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.

DeepSeek V3.1 supports a 33K token context window (32,768 tokens total). That translates to roughly 24,576 words in a single prompt. Plenty for most coding tasks, medium-length documents, and extended conversations.

DeepSeek V3.1 can generate up to 7K output tokens (7,168 tokens) per response. That is roughly 5,376 words. Sufficient for typical conversations, code snippets, and summaries.

DeepSeek V3.1 supports function/tool calling, structured JSON output, extended reasoning/chain-of-thought, streaming responses. Function calling lets you integrate it with external APIs and tools programmatically. These capabilities determine which workflows and integrations the model can handle natively.

Yes, DeepSeek V3.1 is an open-source model. You can download the weights, run it locally, fine-tune it for your use case, or deploy it on your own infrastructure. Many cloud providers also offer hosted versions if you prefer not to manage the infrastructure yourself. Self-hosting gives you full control over data privacy and eliminates per-token API costs.

DeepSeek V3.1 was developed by DeepSeek. It was released on August 21, 2025. You can access it through DeepSeek's API or download the model weights directly. Check our provider page for all models from DeepSeek and how they compare against each other.

Pick DeepSeek V3.1 when you need a solid balance of cost and capability for everyday development tasks, content generation, and standard API integrations. If your task is straightforward text completion or classification, a cheaper model might give you 90% of the quality at a fraction of the price. Run a quick benchmark on your actual use case before committing.

You can access DeepSeek V3.1 through DeepSeek's API using standard HTTP requests or their official SDK. Most providers support OpenAI-compatible endpoints, so switching between models often requires changing just the model name in your API call. Streaming is supported for real-time token-by-token output. For production use, implement proper error handling, rate limiting, and cost monitoring.