Choose a coding tool
For the coding tool, use a common coding agent such as Codex, Claude Code or OpenCode; the prompts work the same. Install and sign in by following each tool's official instructions.
Choose a model
As of late 2026, the recommended models are the top models in the Claude and GPT families, and DeepSeek among open-source models:
| Model | Strengths |
|---|---|
| Claude Opus | Builds better-looking pages and has stronger all-round ability |
| GPT Astra/Sol | Given a fairly complete system design document, can build the whole system |
| DeepSeek | Fast and low-cost. Use it in OpenCode, or connect it to Claude Code by following DeepSeek's documentation |
For design documents and new features, use a strong model with a higher reasoning effort. For small changes such as copy or styling, switch to a faster, cheaper model.
For code review, a model from another vendor finds problems more easily. For example, when Codex built a feature with GPT, open a Claude Code session and have Opus review it:
Review the uncommitted changes. Look for problems against the conventions in AGENTS.md, list them by severity, and don't change any code.