LinkModel API Documentation

Use LinkModel as the model provider behind coding agents that can call OpenAI-compatible, Anthropic-compatible, or Responses-compatible chat endpoints.

Guides

OpenCode

Configure LinkModel as an OpenAI-compatible provider in OpenCode.

Claude Code

Route Claude Code Anthropic-format requests through LinkModel.

Codex

Configure Codex to call GPT-series LinkModel models with the Responses API wire protocol.

Troubleshooting

Diagnose auth, model selection, endpoint, and tool-calling issues.

Endpoint Selection

Agent	Recommended endpoint	Model guidance
OpenCode	`POST /chat/completions`	Use any LinkModel chat model exposed on the Models page.
Claude Code	`POST /messages`	Prefer Anthropic-family models first, then test other chat models for tool compatibility.
Codex	`POST /responses`	Use GPT-series models only, such as `gpt-5.3-codex`, `gpt-5.6-sol`, or `gpt-5`.

Base URL

All agent integrations use this base URL:

https://api.linkmodel.ai/v1

Set the model to one of the supported chat model names from Models.

Coding agents send tool/function-calling fields so they can edit files, run shell commands, and continue multi-step work. If a request fails because of unsupported tool fields, switch to a different model or use the endpoint most closely matching the agent’s native protocol.

​Guides

OpenCode

Claude Code

Codex

Troubleshooting

​Endpoint Selection

​Base URL

​Related API References

Guides

Endpoint Selection

Base URL

Related API References