Anthropic
Connect an Anthropic API key and choose from the Claude models currently available in Mobius.
Connect Anthropic when your organization wants Claude calls to use its own API key. Mobius stores that key as an organization connection and prefers it over the platform Anthropic credential.
This connection supplies model credentials. It does not add actions or source events to an assistant.
Connect the key
Open Build > Integrations > Anthropic, select Connect Anthropic, enter the Anthropic API key, and select Save credentials.
You can also call
POST /v1/integrations/providers/anthropic/connect with api_key. The provider
ID is anthropic.
After saving, open an assistant's Configure page and inspect Model. The current picker offers:
| Model | ID | Guidance shown in Mobius |
|---|---|---|
| Claude Fable 5.1 | claude-fable-5-1 | Long-horizon reasoning |
| Claude Sonnet 5.5 | claude-sonnet-5-5 | Balanced for most work |
| Claude Opus 5.5 | claude-opus-5-5 | Deep reasoning |
GPT-6 Luna is the Mobius default when an assistant has no saved model. Claude Sonnet 5 can remain on existing assignments but is not offered for new choices. A plan may restrict the choices available to your organization.
Understand which credential runs
The model catalog reports Anthropic as byok when your connection supplies the
key and as platform when Mobius supplies it. A BYOK call uses the connected
account's quota. A platform call needs an eligible plan and available Mobius
credits when the turn runs.
Seeing Claude in the model picker proves that credentials are configured. It does not prove that a platform-funded turn will pass its runtime funding check. If a turn fails, open its activity and read the recorded error before changing the assistant or reconnecting the key.
The assistant's saved model is the default for new conversations. A model chosen when a conversation is created is saved as that conversation's override, so later changes to the assistant do not replace it. Conversations without an override continue to use the assistant's current saved model.
Read Integrations for account ownership and connection management. Assistant instructions and settings explains saved models and conversation overrides.