AI Providers
OpenRouter
OpenRouter is a single API that routes to hundreds of models from every major lab. It has free-tier models with no sign-up billing required, making it a great starting point.
Getting your API key
- 1Visit openrouter.ai and sign in.
- 2Go to openrouter.ai/keys and create a key.
- 3Copy the key (starts with
sk-or-). - 4Paste it in Capsul under Settings → API Keys → OpenRouter.
Available models in Capsul
| Model | ID | Tier |
|---|---|---|
| Nemotron Ultra 253B | nvidia/llama-3.1-nemotron-ultra-253b-v1:free | Free |
| MiniMax M1 | minimax/minimax-m1 | Paid |
| Qwen3 Coder | qwen/qwen3-coder | Paid |
| GLM-4.5 Air | thudm/glm-4.5-air:free | Free |
| Step 3.5 Flash | stepfun/step-3-5-flash:free | Free |
| DeepSeek R1 | deepseek/deepseek-r1 | Paid |
| Qwen3 235B | qwen/qwen3-235b-a22b | Paid |
Models marked Free have no per-token cost on OpenRouter. Paid models charge per token; add credits at openrouter.ai/credits.