DeepSeek API: Quick Start and Compatibility with OpenAI and Anthropic

LinkDeepSeekResource

The official DeepSeek API documentation details how to connect using OpenAI- and Anthropic-compatible interfaces alongside the latest V4 models.

Key points

  1. Provides compatible endpoints for both OpenAI (https://api.deepseek.com) and Anthropic (https://api.deepseek.com/anthropic) formats.
  2. Available models include deepseek-v4-flash (DeepSeek-V4-Flash-0731), deepseek-v4-pro (DeepSeek-V4-Pro-0813), and the experimental image-capable deepseek-v4-flash-vision-exp.
  3. Supports reasoning parameters such as thinking and reasoning_effort in chat completion requests.
  4. Integrates directly with coding and agent tools like Claude Code, GitHub Copilot, and OpenCode without custom code.
  5. DeepSeek Harness is released in developer preview for agent harness developers worldwide.

Why it matters

Direct compatibility with existing OpenAI and Anthropic SDKs allows developers to swap in DeepSeek across existing software tools and agent workflows with minimal configuration.

Analysis

DeepSeek focuses on minimising migration friction by adhering strictly to established API standards from OpenAI and Anthropic. This approach allows developers to point existing SDKs or coding assistants (such as Claude Code or GitHub Copilot) directly at DeepSeek endpoints by simply updating the base URL and API key.

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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