Models for coding agents

Run Claude Code, Codex CLI, Cursor, Cline and OpenCode on the models available today with one BigModel.io key, or import the key into CC Switch in one click.

Coding agents spend most of their tokens on long contexts and many tool calls. BigModel.io serves the models you can call today over the two protocols coding tools speak, the Anthropic Messages API and the OpenAI-compatible APIs, so you can switch a tool over without changing how you work.

Pick your tool

Claude CodeAnthropic Messages API · base URL without /v1Setup guide →Codex CLIOpenAI Responses APISetup guide →CursorOpenAI-compatible base URLSetup guide →ClineOpenAI-compatible providerSetup guide →OpenCodeOpenAI-compatible providerSetup guide →Roo CodeOpenAI-compatible providerSetup guide →

One click with CC SwitchOn the API Keys page in the console, the Import to CCS button sends a key to CC Switch, which then switches Claude Code or Codex to BigModel.io. Requires CC Switch v4.0.10 or later.

Open API KeysCC Switch guide

Claude Code in three variables

export ANTHROPIC_BASE_URL=https://bigmodel.io
export ANTHROPIC_AUTH_TOKEN=sk-...
export ANTHROPIC_MODEL=glm-5.3

Copy model IDs from the model directory. Model directory

Keep an agent on a budget

Give each agent its own key with a dollar quota and 5-hour, 1-day or 7-day spend windows. When a limit is reached the key stops, instead of draining your balance. Limits