Evaluation
Round by round
Parallel cloud tasksCodex
Codex spins up many isolated sandboxes.
Local terminal workflowClaude Code
Claude Code is built for the CLI on your machine.
Large refactorsClaude Code
Excellent multi-step reasoning on big repos.
IDE and web surfacesCodex
CLI, IDE extension, web and mobile.
Pick Codex if
Teams batching many PRs on ChatGPT plans.
Pick Claude Code if
Developers who want a deep agent in the terminal.