Critter API Lab

New conversation

Choose your provider and model to begin

What are we making?

Your models. Your conversations.
A little room to experiment.

Ctrl / ⌘ + Enter · provider credits

Model & controls

chat

API providerModel

Instructions & calling route

Conversation instructionsInstruction deliveryCalling route

Responses · stored context. Native routes preserve provider messages and tool results. Changing providers or instructions starts from the visible conversation history.

Generation parameters

TemperatureMax output tokens

Reasoning effort

Provider features & hosted tools

Tools are opt-in and may incur provider charges. Available features depend on the selected model.

Native instruction override

Overrides instructions for this provider in this conversation.

Tool use

Structured output schema

Optional JSON Schema. The provider/model must support structured output.

TypeProperties

Required

Additional Properties

Provider-hosted shell

Allow the model to run commands in the provider’s sandbox. Uses provider credits; the Lab’s API keys are not injected into it.

Shell network domains

Empty uses the provider’s network-disabled default. Add domains needed by your task.

Existing shell container ID

Optional provider container to reuse. Its existing network policy must match.

Web search

Image generation tool

Reasoning effort

Answer verbosity

Server tool call limit

Python code interpreter

Search these vector stores

Your existing OpenAI vector store IDs. Supplying IDs enables file search.

Search domains

Native tools & options

Native options use SDK names. Set options for generation settings; OpenRouter also supports server_tools and manual_tools. Gateway supports named server_tools and manual_tools. No Lab tools are enabled by default.

Advanced parameters

JSON fields override the controls. Use the selected model’s supported parameters.

This catalog does not publish parameter schemas; showing common API controls. Blank controls use provider defaults. Available features vary by model; unsupported options return the provider’s error.