LLM Provider Reference

Supported Providers

Provider	Env Variable	Default Model	Status
Anthropic	ANTHROPIC_API_KEY	claude-sonnet-4-20250514	Primary
OpenRouter	OPENROUTER_API_KEY	anthropic/claude-sonnet-4	Full support
OpenAI	OPENAI_API_KEY	gpt-4o	Full support
ZAI	ZAI_API_KEY	glm-5	Basic support

Configuration

Environment Variables

export ANTHROPIC_API_KEY=sk-ant-...
export OPENROUTER_API_KEY=sk-or-...
export OPENAI_API_KEY=sk-...

Config File (.attocode/config.json)

{
  "provider": "anthropic",
  "api_key": "sk-ant-...",
  "model": "claude-sonnet-4-20250514"
}

CLI Flags

attocode --provider anthropic --model claude-opus-4-20250514

Provider Priority

1. CLI flags (highest)
2. Environment variables
3. Project config (.attocode/config.json)
4. User config (~/.attocode/config.json)
5. Defaults (lowest)

Adding a Provider

1. Create adapter in src/attocode/providers/adapters/
2. Implement LLMProvider base class from providers/base.py
3. Register in providers/registry.py
4. Add model defaults in config.py

Model Context Windows

Context windows are fetched from the model cache at startup. Override with:

{
  "maxContextTokens": 200000
}