Model Providers

Choosing a model

Name the model as <provider>/<model id> when you build the agent. The prefix picks the provider, and the rest is passed to that provider's API as the model id.

Python

agent = await AgentBuilder("anthropic/claude-haiku-4-5").build()

Node.js

const agent = await new AgentBuilder('anthropic/claude-haiku-4-5').build()

Rust

let agent = AgentBuilder::new("anthropic/claude-haiku-4-5").build().await?;

A provider is available once its API key is set in the environment. Ailoy reads the keys the first time an agent is built, so set them before that:

export ANTHROPIC_API_KEY=...

Building an agent for a provider with no key set fails with no entry for model '...' in lang_model_provider 'default'.

Providers

Prefix	Provider	Environment variable	Example
openai/	OpenAI	OPENAI_API_KEY	openai/gpt-5.6-luna
anthropic/	Anthropic	ANTHROPIC_API_KEY	anthropic/claude-haiku-4-5
google/	Google Gemini	GEMINI_API_KEY	google/gemini-2.5-flash
x-ai/	xAI Grok	XAI_API_KEY	x-ai/grok-4-fast
deepseek/	DeepSeek	DEEPSEEK_API_KEY	deepseek/deepseek-chat
moonshotai/	Moonshot AI (Kimi)	KIMI_API_KEY	moonshotai/kimi-k2-thinking
openrouter/	OpenRouter	OPENROUTER_API_KEY	openrouter/openai/gpt-5
bedrock/	Amazon Bedrock	AWS_BEARER_TOKEN_BEDROCK	bedrock/global.anthropic.claude-sonnet-5

• OpenRouter takes OpenRouter's own model ids, which include the vendor: openrouter/openai/gpt-5 sends openai/gpt-5.
• Bedrock takes Bedrock model or inference-profile ids. The region comes from AWS_REGION, then AWS_DEFAULT_REGION, and defaults to us-east-1.