Claude Sonnet 4 API

Claude Sonnet 4 API features

• Easy-to-Use API — Use OpenAI-compatible interface, switch models without code changes.
• Streaming Output — Supports SSE streaming for real-time content generation.
• Flexible Parameters — Supports temperature, max_tokens and other control parameters.

What people build with Claude Sonnet 4

• Customer Service — Build intelligent customer service
• Writing Assistant — Assist with writing, translation, summarization
• Code Assistant — Assist with code writing and debugging

Getting started with the Claude Sonnet 4 API

The endpoint is OpenAI-compatible, so existing client code usually needs only a base URL and a model name.

• Step 1: Sign Up or Log In — Create account and get API Token
• Step 2: Test in Playground — Test prompts and parameters
• Step 3: Integrate into Backend — Connect using API interface
• Step 4: Deploy for Production — Set up concurrency and cost control

Why choose CCAPI for Claude Sonnet 4

• Unified Interface — Switch between chat and reasoning models through one Chat Completions interface.
• Unified authentication — Use one CCAPI token across models instead of managing separate credentials.
• Traceable usage — Review request logs, token usage, and charges in one place for debugging and reconciliation.

Other models on the same endpoint

The same API key and base URL reach every model below. Moving from Claude Sonnet 4 to any of them means changing the model name in the request body.

• Claude Opus 4 API — chat model on the same endpoint
• Claude Haiku 4.5 API — chat model on the same endpoint
• DeepSeek V4 API — chat model on the same endpoint
• MiniMax M2.7 API — chat model on the same endpoint
• GLM-5 API — chat model on the same endpoint
• Qwen 3.5 Plus API — chat model on the same endpoint

Frequently asked questions