LLM Providers

Set TUSK_MAIN_MODEL as provider/model.

Examples:

• anthropic/claude-sonnet-4-5
• openai/gpt-4o
• openrouter/meta-llama/llama-3.1-70b-instruct
• ollama/llama3.2
• custom/my-model

Supported Provider Prefixes

Provider	Prefix	Required Variables
Anthropic	anthropic/	TUSK_ANTHROPIC_API_KEY
OpenAI	openai/	TUSK_OPENAI_API_KEY
OpenRouter	openrouter/	TUSK_OPENROUTER_API_KEY
Ollama	ollama/	TUSK_OLLAMA_BASE_URL (optional TUSK_OLLAMA_API_KEY)
Custom OpenAI-compatible	custom/	TUSK_CUSTOM_OPENAI_BASE_URL, TUSK_CUSTOM_OPENAI_API_KEY

Runtime Switching

Switch model in chat:

/model openai/gpt-4o

This updates active runtime state and persists TUSK_MAIN_MODEL to .env.

Installer Behavior

tusk install helps with provider setup:

• Provider selection
• API key input (or Ollama URL)
• Model selection (auto-fetch where supported, manual fallback for Ollama/custom)