Building with coding agents
Most coding tools, from OpenAI-compatible IDEs like Cursor and Zed to terminal agents like OpenCode, Claude Code, and Codex, let you plug in a custom provider. Point that provider at Merge Gateway and you get every model Gateway supports, including OpenAI, Anthropic, Google, and Kimi, through a single API key. Routing policies, cost governance, and full request observability come built in, visible in the Gateway dashboard.
The three inputs
The OpenAI-compatible IDE guides on this page (Cursor, Zed, Continue.dev) all ask for the same three values:
Get the full list of available models from GET /v1/models or the models page in the dashboard.
OpenCode, Claude Code, and Codex follow different setup shapes (a custom provider in opencode.json, an ANTHROPIC_BASE_URL override, and a model provider + profile in ~/.codex/config.toml respectively); see their dedicated guides below for the exact config.
Supported IDEs
Override OpenAI Base URL in Cursor Settings. Supports Ask and Plan modes.
Add Gateway as an OpenAI-compatible provider in settings.json
One-entry config.yaml change. Works in VS Code and JetBrains.
Add Merge Gateway as a custom provider in opencode.json. Works for tool calls and file edits.
Override ANTHROPIC_BASE_URL and auth token. Works for tool calls and file edits.
Register Merge Gateway in ~/.codex/config.toml and opt in via codex --profile merge_gateway