Skip to main content
Configure your own Anthropic key to use Claude Opus, Sonnet, and Haiku directly. Requests go from your machine to Anthropic — Rumus does not proxy them.

​
Before you start

You need:
  • An Anthropic account and an API key from the Anthropic Console.
  • Available credit on your Anthropic account.

​
Add Anthropic in Rumus

1

Open the model settings

Go to Settings → AI → Models and click Add Model.
2

Pick the provider

Set Provider to Anthropic.
3

Paste your API key

Paste the key from the Anthropic Console into API Key. The field is masked and stored encrypted in your local vault.
4

(Optional) Custom base URL

Leave Base URL blank to use the default (https://api.anthropic.com). Override it only if you’re routing through an Anthropic-compatible proxy or regional endpoint.
5

Pick a model

Choose from the list (Opus 4.6, Sonnet 4.6, Haiku 4.5, etc.) or toggle Enter custom ID to type a model ID manually — useful for snapshot or preview models.
6

Capabilities

Switch to the Capabilities tab and enable what the model supports. For Claude models you typically want:
  • Tool Calling — required for agentic mode.
  • Vision — for image input on multimodal Claude versions.
  • Prompt Cache — Claude supports prompt caching; leave on to cut cost on repeated prompts.
7

Save

Click Save. The model now appears in the chat model picker under Custom Models.
ModelGood for
Claude Opus 4.6Hardest tasks: tricky debugging, multi-step refactors, careful reasoning
Claude Sonnet 4.6Default daily driver — fast, smart, agentic
Claude Haiku 4.5High-volume, latency-sensitive work like autocomplete
For Anthropic’s full lineup and capabilities, see the Anthropic model docs.

​
Tips

  • Prompt caching is on by default for Claude. With long system prompts or repeated context, cache hits can drop input cost by ~90%.
  • Extended thinking (“reasoning”) is supported. Toggle it per thread from the model picker; Anthropic bills thinking tokens as output tokens.
  • If you hit rate limits, raise them in your Anthropic Console workspace settings — Rumus surfaces the upstream error verbatim.

​
Troubleshooting

Recheck the key in the Anthropic Console. Anthropic keys start with sk-ant-. Make sure you didn’t paste a workspace ID by mistake.
You’ve hit Anthropic’s per-minute or per-day limits. Wait, switch to a smaller model, or raise limits on your Anthropic workspace.
Use Enter custom ID to type the model ID exactly (e.g. claude-opus-4-6-20251115).
Hit a snag we didn’t cover? Ask in the Rumus community.

​
Next steps

Other providers

OpenAI, Google, Z.AI, DeepSeek, Kimi, Ollama, OpenAI-compatible.

AI assistant

Plan mode, sub-agents, MCP, command approval.