OpenRouter

One key, essentially every model on the market — plus :free variants of many open models. The best single-key starting point.

Get an API key

1. Sign up at openrouter.ai (Google or email)
2. Open the Keys page (openrouter.ai/settings/keys)
3. Click 'Create Key' and name it
4. Copy the key now — it's shown only once
5. Set OPENROUTER_API_KEY

Create a key ↗ · Pricing ↗

Free (:free) models work at $0 balance; add credits for paid models/limits.

Enable

export OPENROUTER_API_KEY=...        # shell profile — survives forever

or in the terminal — validates the key live before saving:

/enable openrouter

or pick any locked 🔒 OpenRouter model in /models and paste the key inline.

Models

Starter menu (once enabled, /models fetches the provider's full live list):

• openai/gpt-oss-120b
• z-ai/glm-4.7
• moonshotai/kimi-k2
• deepseek/deepseek-chat
• qwen/qwen3-235b-a22b

Switch anytime — /model gpt-oss-120b fuzzy-matches; context carries over.

SDK

from mantis_agent import MantisAgentOptions
options = MantisAgentOptions(
    model="openai/gpt-oss-120b",
    backend="https://openrouter.ai/api/v1",     # key read from $OPENROUTER_API_KEY
)

Notes

• Try :free model variants (e.g. meta-llama/llama-3.3-70b-instruct:free) before spending anything.
• Model ids are namespaced (z-ai/glm-4.7, moonshotai/kimi-k2).