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OpenAI Codex vs Kiro (Amazon Q Developer)
OpenAI Codex scores higher overall (8.7 vs 6.9), but the right pick depends on what you need.
Choose OpenAI Codex if…
Developers who want parallel, asynchronous tasks and pull requests back, bundled with ChatGPT
8.7/10★★★★★Full review →Choose Kiro (Amazon Q Developer) if…
AWS-centric teams who want plan-first, spec-driven development
6.9/10★★★★★Full review →Side by side
| OpenAI Codex | Kiro (Amazon Q Developer) | |
|---|---|---|
| Overall score | 8.7/10 | 6.9/10 |
| Rank in category | #1 of 13 | #12 of 13 |
| Price | Freemium · from $8/month | Freemium · from $20/month |
| Free version | Quick coding tasks on ChatGPT Free | 50 credits a month |
| Platforms | Web, iOS, VS Code, Terminal, Desktop app | Desktop app, Terminal, VS Code, JetBrains |
| Made by | OpenAI | Amazon Web Services |
| Code quality | 9 | 7 |
| Ease of use | 8 | 6.5 |
| Features | 8.5 | 8 |
| Value for money | 9 | 6.5 |
| Platforms | 9 | 6 |
OpenAI Codex: what the AI does
- Cloud agent in sandboxed machines that delivers pull requests
- Open-source Codex CLI
- IDE extension and desktop app with multi-agent management
- Automatic GitHub code review
- Subagents, skills, hooks and MCP
- Codex Security vulnerability agent
- Top CLI agent on Terminal-Bench 2.0
- Low entry price, with free and $8 tiers
- Many surfaces: web, CLI, IDE, desktop, iOS
- Open-source CLI
- Async cloud tasks add latency for quick edits
- Only OpenAI models
- Free and Go tiers get a lighter model
Kiro (Amazon Q Developer): what the AI does
- Spec-driven development (requirements, design, tasks)
- Parallel local and cloud agents
- Property-based tests and requirement checks
- Agent hooks, steering files and MCP
- Headless CLI for CI pull request review
- Choice of Claude, GPT and open-weight models
- Spec-first workflow catches design problems early
- Wide model choice
- Native AWS context and enterprise controls
- Permanent free tier
- Credit metering criticised in reviews
- Autocomplete lags Cursor for quick edits
- Transition from Q Developer is confusing