Anthropic · Ai Models

Anthropic / Create message

Claude chat: send model, maxtokens and messages (user and assistant turns; put the system prompt in system). Returns content[0].text, stopreason and usage. No streaming. Bring your own key: runs on your Anthropic account, which bills you; looot charges $0.

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Published API evidence

Public metadata only. Response bodies, credentials, and internal review notes are never displayed.

No verification date is claimed. No response capture is claimed.

Request parameters

max_tokens body · required
messages body · required
model body · required
claude-sonnet-4-5, claude-opus-4-1, claude-haiku-4-5 or a newer id.
stop_sequences body · optional
system body · optional
temperature body · optional
anthropic_version header · optional
anthropic-version header, default 2023-06-01.

No allowlisted official documentation or pricing reference is available.