Anthropic

Set up your Anthropic API key and available models

Anthropic

Anthropic builds the Claude family of models. CtxSync supports Anthropic as an LLM provider — bring your own API key and use Claude models in your project chats.

Anthropic Console

Getting your API key

  1. Go to console.anthropic.com and sign in (or create an account).
  2. Navigate to API Keys in the sidebar.
  3. Click Create Key.
  4. Copy the key — you won’t be able to see it again.
  5. In CtxSync, go to Settings → API Keys.
  6. Select Anthropic as the provider and paste your key.

Note: Anthropic requires adding credits to your account before API keys will work. Check their pricing page for current rates.

Available models

Model ID Best for
Claude Opus claude-opus-4-6 Deep reasoning, large codebases, nuanced analysis
Claude Sonnet claude-sonnet-4-5 Fast and balanced — great all-around performance at lower cost

Claude Opus is the most capable model, ideal for complex code analysis and multi-file reasoning. Claude Sonnet offers a strong balance of speed and quality for everyday tasks.

Once your key is saved, you can select Anthropic models when starting a new chat.