Choose a model

Every agent uses one AI model to decide what to do on the phone. You choose it with the model field. If you leave it out, Lusor uses the default model.

Model ids

A model id names the provider and the model, for example deepseek/deepseek-flash. These are the models the Lusor app offers:

Model id	Good for
`deepseek/deepseek-flash`	Simple tasks. The default.
`openai/gpt-6-luna`	Simple tasks.
`anthropic/claude-haiku-5-5`	Simple tasks.
`anthropic/claude-sonnet-5-5`	Moderately complex tasks.
`openai/gpt-6.1-sol`	Complex tasks.
`anthropic/claude-opus-5-5`	Complex tasks.

auto is an alias for the default model. Lusor stores it as deepseek/deepseek-flash, so that is what you read back. The model you choose affects how many credits a session uses. See Credits and minutes.

Copy model ids exactly as shown, including the provider prefix.

On an agent

Set model when you create the agent, or change it later:

curl -X PATCH https://api.lusor.ai/v1/agents/<agent id> \
  -H "X-Api-Key: $LUSOR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "model": "anthropic/claude-opus-5-5" }'

import os, requests

requests.patch(
    "https://api.lusor.ai/v1/agents/<agent id>",
    headers={"X-Api-Key": os.environ["LUSOR_API_KEY"]},
    json={"model": "anthropic/claude-opus-5-5"},
)

await fetch("https://api.lusor.ai/v1/agents/<agent id>", {
  method: "PATCH",
  headers: { "X-Api-Key": process.env.LUSOR_API_KEY, "Content-Type": "application/json" },
  body: JSON.stringify({ model: "anthropic/claude-opus-5-5" }),
});

The agent’s next turn uses the new model. The agent’s model field always holds the model id it uses.

On a session without an agent

A session started without an agent takes model in its body. Leave it out, or send null or auto, for the default model.

curl https://api.lusor.ai/v1/workspaces/<workspace id>/devices/<device id>/sessions \
  -H "X-Api-Key: $LUSOR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "prompt": "Find the cheapest flight to Lisbon next Friday.", "model": "openai/gpt-6.1-sol" }'

A turn sent to an agent always uses the agent’s model.

Get started

Agents & sessions

Phones

Billing and limits

Choose a model

Model ids

On an agent

On a session without an agent

​Model ids

​On an agent

​On a session without an agent

Model ids

On an agent

On a session without an agent