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DeepSeek V3.1

DeepSeek V3.1 is DeepSeek's August 21, 2025 model update introducing hybrid inference with selectable thinking and non-thinking modes in one endpoint. It strengthens tool use and multi-step agent capabilities over DeepSeek-V3.

ReasoningTool Use
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'deepseek/deepseek-v3.1',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • What does "hybrid inference" mean for DeepSeek V3.1?

    The same model weights support both a thinking mode (extended chain-of-thought) and a non-thinking mode (direct completion). Select the mode by calling deepseek-reasoner for thinking or deepseek-chat for non-thinking. No separate model switch is needed.

  • Is DeepSeek V3.1's thinking mode faster than DeepSeek-R1?

    Yes. DeepSeek-V3.1-Think reaches answers in less time than DeepSeek-R1-0528 on equivalent tasks.

  • Does DeepSeek V3.1 support the Anthropic API format?

    Yes. Existing Anthropic-format integrations can route to DeepSeek V3.1 without additional conversion.

  • What is strict function calling and is it available in DeepSeek V3.1?

    It's in beta for DeepSeek V3.1. Strict function calling requires tool call arguments to match the provided JSON schema exactly.

  • What is the context window for DeepSeek V3.1?

    163.8K tokens for both thinking and non-thinking modes.