Gemini

Google's Gemini via the OpenAI-compatible surface of the Generative Language API. AI Studio keys come with a free quota.

Get an API key

1. Sign in at aistudio.google.com with a Google account
2. Open the API keys page, click 'Create API key'
3. Create in a new or existing Google Cloud project
4. Copy the key and set GEMINI_API_KEY

Create a key ↗ · Pricing ↗

Free tier with rate limits; paid tier unlocks higher quotas.

Enable

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

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

/enable gemini

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

Models

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

• gemini-2.5-pro
• gemini-2.5-flash
• gemini-2.0-flash

Switch anytime — /model gemini-2.5 fuzzy-matches; context carries over.

SDK

from mantis_agent import MantisAgentOptions
options = MantisAgentOptions(
    model="gemini-2.5-pro",
    backend="https://generativelanguage.googleapis.com/v1beta/openai",     # key read from $GEMINI_API_KEY
)

Notes

• GOOGLE_API_KEY works too (alias).
• AI Studio keys have a free quota on flash models — a zero-cost way to try mantis on a hosted model.