Option	Type	Default	Description
anthropicApiKey	string	undefined	API key for Anthropic. Optionally can be set using process.env.ANTHROPIC_API_KEY
model	string	—	The model to use. Must be specified when using anthropic.chat.v1.
temperature	number	undefined	Maps to temperature. See Anthropic Docs
maxTokens	number	4096	Maps to max_tokens. See Anthropic Docs
topP	number	undefined	Maps to top_p. See Anthropic Docs
topK	number	undefined	Maps to top_k. See Anthropic Docs
stopSequences	array	undefined	Maps to stop_sequences. See Anthropic Docs
stream	boolean	undefined	Note: Not supported yet.
metadata	object	undefined	Maps to metadata. See Anthropic Docs
serviceTier	string	undefined	Maps to service_tier. See Anthropic Docs

NOTE

Sampling parameter restrictions: claude-opus-4-7 rejects requests that include temperature, topP, or topK — llm-exe silently drops these for that model. For other Claude 4.x models, topP is silently dropped when temperature is also set, because the Anthropic API does not allow both simultaneously.

Anthropic Docs: link