AidervsCodex CLI
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
Aider
Aider AI (Paul Gauthier) · Terminal agent
#7OSS
Panel
7.12 spec wins
- Reliability
- 7.2
- Usefulness
- 6.8
- Cost
- 7.5
- Longevity
- 7.0
“Commits every change to git so you can see exactly which one broke the build.”
Codex CLI
OpenAI · Terminal agent
#1OSSMCP
Panel
7.14 spec wins
- Reliability
- 7.3
- Usefulness
- 7.0
- Cost
- 6.8
- Longevity
- 7.2
“Apache-2.0, so you can read every line except the one that lets you pick a model that is not OpenAI's.”
Spec by spec
| Spec | Aider | Codex CLI |
|---|---|---|
| Architecture | ||
| Category | Terminal agent | Terminal agent |
| Runs | local | local |
| Platforms | macos, linux, windows | macos, linux, windows |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | Yes |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | Yes | Yes |
| Git operations | Yes | Yes |
| Browser control | YesThe /web command and URL detection drive a real Chromium through Playwright to render and read pages (--disable-playwright turns it off); the --browser flag is only aider's own Streamlit GUI. | NoThe shared Codex codebase carries a browser-use configuration with Chrome DevTools Protocol access, but OpenAI's documentation states browser is not available in the Codex CLI or the IDE extension; it runs in ChatGPT on the web and in the desktop app. The CLI's --search flag adds live web search only. |
| Sandboxed execution | NoAider publishes a Docker image as an install option only; commands it runs are not sandboxed. | Yes |
| Multi-agent orchestration | No | Yes |
| Headless / CI mode | Yes | Yes |
| Models | ||
| Backbone | OpenAI, Anthropic, Gemini, DeepSeek, OpenRouter, Bedrock, Vertex AI, Azure, Groq, xAI, Ollama, LM Studio | OpenAI GPT-5.x, GPT-5.x-Codex |
| Bring your own model | Yes | Yes |
| Local models | Yes | Yes |
| Cost | ||
| Pricing model | byok | mixed |
| Starts at | $0/mo | $8/mo |
| Free tier | Yes | Yes |
| Bring your own key | Yes | Yes |
| Openness | ||
| Open source | Yes | Yes |
| License | Apache-2.0 | Apache-2.0 |
| GitHub stars | 49,324 | 127,563 |
Which one would each critic pick
| Critic | Aider | Codex CLI | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 7.5 | 8.0 | Codex CLI — If you already pay for ChatGPT, this is the terminal agent you have and it is a good one; open source, MCP, headless, and pointed at OpenAI until you configure it otherwise. |
| El Crítico | 7.3 | 7.0 | Aider — Every edit is a real edit on your disk with no sandbox, and auto-commit is the one mitigation standing between a bad command and your afternoon. |
| El Profesor | 8.3 | 6.3 | Aider — The most legible architecture on the board, with a published harness; the SWE-bench numbers are from 2024 and should be read as history, not as a claim. |
| La Inversora | 5.3 | 8.3 | Codex CLI — A lab's terminal agent bundled into a $20 subscription with 121,000 stars on the repo; the distribution is ChatGPT, and that is the whole thesis. |
| La Jefa | 5.5 | 7.3 | Codex CLI — Business at $20 a seat with SAML SSO and no default training, Enterprise for SCIM and audit logs; if the org is on ChatGPT already, this is a line item, not a project. |
| El Hacker | 9.0 | 5.8 | Aider — Python I can read, prompts in the repo, .aider.conf.yml for model and edit format, --model ollama/anything for an air-gapped box; MCP is the one gap. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.