Claude Cowork
How to run Claude Cowork with third-party inference providers
A walkthrough using Opper as the gateway: configure Cowork's Developer-mode dialog, add models across AWS Bedrock, GCP Vertex, and Azure, and switch providers mid-session.
Agent CLI
Run Claude Code, Codex,
and more on any model
A CLI router for AI agents — EU-hosted models, automatic fallbacks, and pay-as-you-go inference.
Claude Code
Anthropic's coding agent
Codex
OpenAI's coding agent
OpenCode
SST's open-source coding agent
OpenClaw
Open-source personal AI agent
Hermes
Nous's open-source agent
Pi
Personal AI from Inflection
Why a gateway
Residency, fallbacks, cost
EU data residency
Every model in the catalog is tagged with where it's deployed. Configure your agent to route only to EU-hosted models — Claude on GCP Vertex EU, Sonnet on AWS Bedrock EU, open-weight on Evroc — when inference has to stay in Europe.
Browse the model catalog →Automatic fallbacks
The same model — Claude Sonnet, say — is wired up across AWS, Azure, and GCP. If one rate-limits or goes down mid-session, the gateway routes to the next upstream without interrupting the agent.
How fallbacks work →Cheaper for routine work
Not every prompt needs Opus. Run OpenCode or OpenClaw on a smaller or open-weight model for routine work — up to 98% cheaper for the same task — without leaving the CLI.
See the cost breakdown →Install
Install the Opper Agent CLI
One npm install, one OAuth login — then launch Claude Code, Codex, OpenCode, OpenClaw, Hermes, or Pi.
terminal
# Install (Node 20.12+)
# Sign in (OAuth device flow)
# Launch an agent
# Or wire your editor
FAQ
Claude Code & Opper Agent CLI FAQ
How do I change the model or use a different LLM in Claude Code?
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Install the Opper CLI, run
opper login, then launch Claude Code with any model:$ opper launch claude --model openai/gpt-5.5 $ opper launch claude --model anthropic/claude-opus-4-7Switch models mid-session by relaunching with a different
--modelflag — no config changes needed.How does this compare to claude-code-router or OpenRouter?
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Claude Code Router is an open-source proxy you run and maintain locally. OpenRouter is a hosted inference gateway. The Opper Agent CLI is a hosted CLI that wraps both: install once, log in once, then 'opper launch <agent>' routes Claude Code (and Codex, OpenCode, Hermes, Pi, OpenClaw) through Opper's gateway — with EU residency, automatic fallbacks, and pay-as-you-go billing. No local proxy to maintain.
How is this different from running each agent directly?
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Most agents need their own provider keys, billing accounts, and rate-limit handling. With Opper you log in once and every agent shares the same key, the same 300+ model catalog, and the same observability — so switching from Claude Code to Codex to Hermes doesn't mean re-configuring your environment.
Do I need separate API keys for OpenAI, Anthropic, etc.?
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No. Every supported agent runs through Opper's gateway, which routes to 300+ models with one Opper API key.
Is Claude Code free? How much does it cost via Opper?
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The Opper Agent CLI is free. Inference is pay-as-you-go: provider cost + 3% gateway fee, billed to your Opper account. Claude Code via Opper costs the same as Anthropic's direct rate plus a small gateway margin. See full pricing.