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AI · October 21, 2026

Mouse-1

A decision model for your agent harness.

Mouse-1 launched on October 21, 2026 with 95 votes, #151 of 3,213 launches that month and more than 95% of that year's launches.

Visit mouse.dev ↗Mouse-1 alternativestop 5% of October 2026

What it does

An agent makes hundreds of small decisions during a task. We built Mouse-1 to handle these decisions, saving you time and money. Its 163x cheaper, and 65x faster than GPT-6 Sol. It works by adding the model directly into your agent harness alongside your current stack. Mouse-1 takes the agent's state and options and returns a probability. This lets the harness handle all the small decisions while the main frontier model takes care of the reasoning or code.

Mouse-1 is the fast decision layer for your agent, saving you time and money.

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