Supported Models

Weco supports models from multiple AI providers. The model you use affects the optimization quality, speed and credit cost. You can specify which model to use with the -M or --model flag when starting your optimization run with weco run. If you don't specify a model, Weco automatically uses the default model o4-mini.

OpenAI

• gpt-5 (recommended)
• gpt-5-mini
• gpt-5-nano
• o3-pro (recommended)
• o3 (recommended)
• o4-mini (recommended)
• o3-mini
• o1-pro
• o1
• gpt-4.1
• gpt-4.1-mini
• gpt-4.1-nano
• gpt-4o
• gpt-4o-mini
• codex-mini-latest

Anthropic

• claude-opus-4-1
• claude-opus-4-0
• claude-sonnet-4-0
• claude-3-7-sonnet-latest

Google

• gemini-2.5-pro
• gemini-2.5-flash
• gemini-2.5-flash-lite

What's Next?

• Start optimizing: Follow the Quickstart guide to set up your API key and run your first optimization
• Choose the right model: Different models offer trade-offs between speed and quality - experiment to find what works best for your use case
• Learn more about CLI options: Check the CLI Reference for all available command flags and options
• Write better evaluations: Read our guide on Writing Good Evaluation Scripts to get the most out of your optimizations