Compare a competitor with Claude Code on your code
Open Reason on the web or the Mac app
Sign in at reasonmachines.com, or download the Reason app for macOS from reasonmachines.com/download. Both open the same Sessions. Sending work to Reason needs a Pro or Max plan.
Connect the plans you already pay for
In Settings › Models, connect subscriptions such as Claude (Pro or Max), ChatGPT (Plus, Pro or Business), Grok (SuperGrok or X Premium+) or GitHub Copilot, or add API keys. Reason runs on your own accounts first; a Reason plan's credits cover the rest.
Give it a task you know the answer to
In the composer, name the repository and paste a task you've already solved, such as a failing test. Reason works on its own cloud computer, runs the tests and opens a pull request, so you can compare its diff with your other agent's.
Switch the model and compare
Start a second Session on the same branch with a model from another provider, and ask it to review the first diff. Each Session shows the model and account it ran on.
Claude Code competitors at a glance
| Made by | Open source | Where it runs | Price | |
|---|---|---|---|---|
| Codex | OpenAI | CLI under Apache-2.0 | CLI, IDE, desktop, web, iOS; Codex cloud tasks keep working while your computer sleeps | Included in ChatGPT Free and Go; Plus $20; Pro $100 to $500 a month |
| Cursor | Anysphere | Not open source | AI code editor; Cloud Agents run in cloud VMs, from the editor, web, iOS or Slack | Free; Plus $8 (Grok models only); Premium $30; Super $100; Ultra $200 a month |
| GitHub Copilot cloud agent | GitHub | Not open source | Works in the background in a cloud environment; sessions on Actions run at most 59 minutes | Copilot paid plans from $10 to $100 a month; Business $19 per seat |
| Devin | Cognition | Not open source | Cloud workspace with shell, IDE and browser; CLI, desktop; Slack and Teams | Free; Pro $20; Max $200 a month; Teams $80 a month plus $40 per seat |
| opencode | The opencode project | MIT | Terminal, desktop and IDE; 75+ providers and local models | Free; optional OpenCode Go from $10 a month |
| Aider | Aider-AI (GitHub) | Apache-2.0 | Pair programming in your terminal; almost any LLM, local ones included | Free; you pay your model provider |
| Cline | Cline Bot Inc. | Apache-2.0 (JetBrains plugin excepted) | IDE, terminal and desktop; cron schedules; Slack and other chat apps; Ollama and LM Studio | Free and open source; you pay your model provider |
| Reason | Reason Machines | Not open source | Web, Mac and iOS apps, Slack, command line; its own cloud computer per Session, or yours | Pro $50, Max $200 a month; credits |
From each vendor's own pages, checked Nov 2, 2026. Also competing: Google Antigravity, with a $0 individual plan and Google AI Pro at $20 a month, and xAI's Grok Build, a terminal and headless coding agent. Gemini CLI moved free individual access to Antigravity CLI on June 18, 2026.
How they compare on benchmarks
On Artificial Analysis's Coding Agent Index v2.0 (October 2026: FrontierCode v1.1, Terminal-Bench 4.0 and SWE-Atlas-QnA-AA), Claude Code on Opus 5.5 scores 62, Codex on GPT-6 Astra 55 and Grok Build on Grok 4.7 47, as listed on its comparison pages, checked Nov 2, 2026. Scores measure a harness and model together; try the same task in each on your own repository.
Open-source agents (opencode, Aider, Cline, OpenHands) aren't on the index; their results depend on the model you give them.
Sources (checked Nov 2, 2026)
- OpenAI: Codex pricing
- Cursor: pricing
- GitHub Docs: Copilot plans
- Devin: pricing
- Google Antigravity: pricing
- google-gemini/gemini-cli on GitHub
- xAI: Grok Build overview
- anomalyco/opencode on GitHub (MIT)
- Aider-AI/aider on GitHub (Apache-2.0)
- cline/cline on GitHub (Apache-2.0)
- Artificial Analysis: Coding Agent Index
- Artificial Analysis: Claude Code vs Codex
- Artificial Analysis: Claude Code vs Grok Build
- Reason docs: plans
Questions
Who are Claude Code's competitors?
Codex, Cursor, GitHub Copilot, Devin, Google Antigravity, Grok Build, and open-source agents such as opencode, Aider and Cline. Reason is an always-on teammate that codes and can run Claude models on your Claude plan.
Is GitHub Copilot a Claude Code competitor?
Yes. Copilot's cloud agent works on a repository in the background in a cloud environment and opens pull requests, on paid Copilot plans from $10 a month.
What is the cheapest Claude Code competitor?
opencode, Aider and Cline are free and open source; you pay your model provider, or nothing with a local model. Codex is included in ChatGPT Free and Go.
Which competitor scores highest?
On Artificial Analysis's Coding Agent Index v2.0, Claude Code on Opus 5.5 (62) is ahead of Codex on GPT-6 Astra (55) and Grok Build on Grok 4.7 (47).
What happens when an agent hits its usage limit?
Claude Code, Codex and Cursor stop or offer paid usage at their plan's limits. Hit your limit? Reason keeps going on your other connected accounts or Reason credits.
Is Reason affiliated with these vendors?
No. Reason is built by Reason Machines and is not affiliated with or endorsed by Anthropic, OpenAI, Anysphere, Cognition, GitHub, Google or xAI. Facts about their products come from their own pages, linked under Sources.