Quick Verdict
OpenAI Codex leads on SWE-bench (72.8% vs -)
Pricing
| OpenAI Codex | GitHub Copilot CLI | |
|---|---|---|
| Price | $20-200/mo | $10-39/mo (Copilot subscription) |
| Open source | Yes ✅ | No ❌ |
| Best for | Parallel task execution | GitHub-native terminal agent with PR/issue integration |
Performance & Benchmarks
OpenAI Codex scores 72.8% and GitHub Copilot CLI scores - on SWE-bench. Here’s what that actually means for daily use.
OpenAI Codex is built for parallel task execution. It’s open source with $20-200/mo pricing. SWE-bench: 72.8%
GitHub Copilot CLI is built for github-native terminal agent with pr/issue integration. It’s a commercial product with $10-39/mo (Copilot subscription) pricing.
Feature Comparison
| Feature | OpenAI Codex | GitHub Copilot CLI |
|---|
Pros & Cons
OpenAI Codex
Pros:
- Parallel Git worktree execution
- Cloud sandboxed agents
- Included in ChatGPT Plus
Cons:
- OpenAI models only
- Cloud-dependent for parallel mode
GitHub Copilot CLI
Pros:
- Deep GitHub integration
- Multi-model (Claude Sonnet 4.5, GPT-5)
- MCP server built-in
Cons:
- Requires Copilot subscription
- GitHub ecosystem dependent
Verdict
OpenAI Codex leads on SWE-bench (72.8% vs -)
OpenAI Codex is recommended for: Parallel ticket processing and batch tasks GitHub Copilot CLI is recommended for: Developers in GitHub ecosystem wanting terminal agent
For a full overview of all 15 agents, see the Complete Guide to AI Coding Agents.