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Claude Code is Anthropic’s agentic coding tool for the terminal. It reads your whole repository, plans and applies changes across files, runs commands and tests, and iterates on failures. It ships with built-in gateway support, so pointing ANTHROPIC_BASE_URL at Opper runs the same harness on any model in the catalog — not just Claude.

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Setup

One command, no config files:
This sets ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN for the session and starts Claude Code. Pin a model with --model <id>.
To wire it by hand instead:
Claude Code appends /v1/messages itself and talks to Opper’s Anthropic-compatible surface. Everything else about the agent is unchanged.

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Full guide

Claude Code has more configuration surface than any other integration here — model alias mapping, the /model picker, per-project settings, CI usage, and migrating from OpenRouter. All of it lives in the dedicated guide:

Run Claude Code on any model

Manual setup, alias mapping, per-project config, CI, and troubleshooting.

Claude Desktop

The same agent inside Anthropic’s desktop app.

All integrations

Every app that runs on Opper.