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Mux supports multiple AI providers. Configure provider API keys in Settings → Providers — see Providers for setup.

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First-class Models

Mux ships with curated models kept up to date with the frontier. Use any custom model with /model <provider:model_id>.

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Model Selection

Keyboard shortcuts:
  • Cycle models
    • macOS: Cmd+/
    • Windows/Linux: Ctrl+/
To choose a specific model, click the model pill in the chat footer. Alternatively, use the Command Palette (Cmd+Shift+P / Ctrl+Shift+P):
  1. Type “model”
  2. Select “Change Model”
  3. Choose from available models
Models are specified in the format: provider:model-name

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One-shot Overrides

Override the model or thinking level for a single message using slash commands. The override applies only to that message — workspace settings stay unchanged.

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Syntax

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Thinking levels

Append +level to any model alias. Levels can be named (off, low, medium/med, high, max) or numeric (0–9). Numeric levels are model-relative — they map to the model’s allowed thinking range:
  • 0 = model’s lowest allowed level (e.g., off for Sonnet, medium for GPT-5.5 Pro)
  • Higher numbers select progressively higher levels, clamped to the model’s maximum
This means /sonnet+0 disables thinking while /gpt-pro+0 sets thinking to medium (GPT-5.5 Pro’s minimum). Use /+level (no model) to override thinking on the current model: /+0 quick answer

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CLI

The mux run CLI accepts the same thinking levels via --thinking:

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Next Steps

Configure Providers

Set up API keys for Anthropic, OpenAI, Google, and other providers.