Claude (Anthropic)

Claude, natively — mantis speaks the real Messages API (x-api-key), not a translation layer. Gateways/OAuth work via Bearer tokens.

Get an API key

1. Sign in at console.anthropic.com
2. Open Settings → API Keys
3. Click 'Create Key' and name it
4. Copy the sk-ant- key (shown once)
5. Add credits under Settings → Billing

Create a key ↗ · Pricing ↗

No ongoing free tier; buy prepaid credits (small trial credit may apply).

Enable

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

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

/enable anthropic

or pick any locked 🔒 Claude (Anthropic) model in /models and paste the key inline.

Models

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

• claude-opus-4-8
• claude-sonnet-5
• claude-haiku-4-5-20251001
• claude-fable-5

Switch anytime — /model claude-opus-4 fuzzy-matches; context carries over.

SDK

from mantis_agent import MantisAgentOptions
options = MantisAgentOptions(
    model="claude-opus-4-8",
    backend="https://api.anthropic.com/v1",     # key read from $ANTHROPIC_API_KEY
)

Notes

• Behind a gateway or OAuth? Set ANTHROPIC_AUTH_TOKEN instead of the API key — mantis sends Authorization: Bearer and preserves your gateway URL.
• Tool definitions are converted to Anthropic's input_schema shape automatically.