Modes & Models

The Amp coding agent uses the best model for each task: leading generalist foundation models for complex reasoning and planning, and smaller specialized models for fast, accurate responses in specific domains.

Agent Modes

Low

Fast, low-cost mode for small, well-defined tasks

Agent GLM-5.3-Flash · high

Medium

Default for most tasks, balancing quality, speed, and cost

Agent Opus 5.5 · high

High

Use for difficult tasks that need deeper reasoning and can tolerate more time and cost

Agent GPT-6 Astra · med

Ultra

Use for the hardest open-ended tasks when maximum capability matters more than speed or cost

Agent Fable 5.2 · high

Puck

Navigate work across Amp projects, threads, and context

Opus 5.5 or GPT-6.1 Sol

Puck Auto uses Opus 5.5 with an active, unpaused Claude subscription when personal Model Routing is allowed. Otherwise it uses GPT-6.1 Sol. Both default to low effort. A usable saved model pin overrides Auto.