Before you start
You need:- A DeepSeek account at platform.deepseek.com.
- An API key from the API Keys page on your DeepSeek dashboard.
- Sufficient credit on your DeepSeek account.
Add DeepSeek in Rumus
1
Open the model settings
Go to Settings → AI → Models and click Add Model.
2
Pick the provider
Set Provider to DeepSeek.
3
Paste your API key
Paste the key into API Key. It’s stored encrypted in your local vault.
4
(Optional) Custom base URL
Leave Base URL blank to use the default
https://api.deepseek.com. Override only for proxies or alternative regional endpoints.5
Pick a model
Choose from the list, or toggle Enter custom ID to type a model ID manually.
6
Capabilities
Capability flags are pre-set for the built-in models. For a custom model ID, set them to match what DeepSeek’s docs say the model supports.
7
Save
The model appears in the picker under Custom Models.
Recommended models
Both models offer a 128K context window. The Reasoner exposes thinking tokens; tool calling is only supported on
deepseek-chat.
For the latest on the DeepSeek lineup, see the DeepSeek API docs.
Tips
- Reasoner vs Chat. Pick the Reasoner only when extra thinking helps — it spends more output tokens. For agentic work that needs tool use, stay on
deepseek-chat. - Pricing is among the lowest of any major provider. If cost matters, DeepSeek is a strong daily driver.
Troubleshooting
Model not in the list
Model not in the list
Toggle Enter custom ID and paste the exact model ID (e.g.
deepseek-reasoner).Tool calls don't work on the Reasoner
Tool calls don't work on the Reasoner
The Reasoner doesn’t support tool calling — switch to
deepseek-chat for agentic tasks.Hit a snag we didn’t cover? Ask in the Rumus community.
Next steps
Other providers
Anthropic, OpenAI, Google, Z.AI, Kimi, Ollama, OpenAI-compatible.
Built-in models
Use Rumus’s bundled DeepSeek models without managing a key yourself.