# API Keys (Required to enable respective provider)
ANTHROPIC_API_KEY=your_anthropic_api_key_here       # Required: Format: sk-ant-api03-...
PERPLEXITY_API_KEY=your_perplexity_api_key_here     # Optional: Format: pplx-...
OPENAI_API_KEY=your_openai_api_key_here             # Optional, for OpenAI/OpenRouter models. Format: sk-proj-...
GOOGLE_API_KEY=your_google_api_key_here             # Optional, for Google Gemini models.
GROK_API_KEY=your_grok_api_key_here                 # Optional, for XAI Grok models.
MISTRAL_API_KEY=your_mistral_key_here               # Optional, for Mistral AI models.
AZURE_OPENAI_API_KEY=your_azure_key_here            # Optional, for Azure OpenAI models.
AZURE_OPENAI_ENDPOINT=your_azure_endpoint_here      # Optional, for Azure OpenAI.
OLLAMA_BASE_URL=http://localhost:11434/api          # Base URL for local Ollama instance (Optional)