OpenAI Codex vs Supermaven
Pricing
OpenAI Codex: Included in ChatGPT plans (Plus $20/mo, Pro from $100/mo), limited use on Free and Go
Supermaven: Being sunset since November 2025, free autocomplete for existing users
Description
OpenAI Codex: OpenAI's coding agent, which works in the ChatGPT desktop app, your terminal, your editor and the cloud on your ChatGPT plan
Supermaven: Fast AI code completion that Cursor acquired in 2024 and began shutting down in November 2025
Pros
- Runs in the ChatGPT desktop app, the CLI, an IDE extension and on the web, all tied to one ChatGPT account
- Cloud tasks keep going after you close your laptop, in a reusable environment for each repo
- Reviews GitHub pull requests when you tag @Codex or turn on automatic reviews
- Existing JetBrains and Neovim customers keep free autocomplete
- Fast completions, with a 1 million token context window on the Pro plan
Cons
- Free and Go plans only get limited use in the desktop app, on the smaller GPT-6 Luna model
- Plus usage is counted per five-hour window and weekly limits can also apply, and how far it goes depends on the model and the size of the task
- Running it on an API key instead of a plan drops the cloud features, such as GitHub code review and Slack
- Agent chat was discontinued in November 2025
- VS Code users have been told to move to Cursor
- No new features: the product is being wound down
Details
Codex is OpenAI’s coding agent. You hand it a task, such as a hard-to-find bug, a refactor or a new feature, and it reads the code, makes the changes and checks its own work, using browser and computer tools where it needs them. It can run several agents in parallel, and cloud tasks carry on while your laptop is closed.
It comes with ChatGPT, so if you already pay for Plus you already have it. The same account works in the desktop app, the terminal, your editor and on iOS.
OpenAI describes Plus at $20/month as enough for a few focused coding sessions a week. Heavier use means Pro, from $100/month, which currently has no five-hour limit, or buying extra credits when you hit the limit. You can also run the CLI on an API key and pay standard API rates, which suits automation such as CI.
Supermaven was the speed king of AI code completion. Built by the creator of Tabnine, it focused on autocomplete with very low latency and a massive context window. Cursor acquired Supermaven in November 2024 and folded its technology into the Cursor editor.
On 21 November 2025 Supermaven announced its sunset. Agent conversations ended, paying customers received refunds for their remaining time, and VS Code users were told to move to Cursor. Existing JetBrains and Neovim customers keep free autocomplete for the foreseeable future. There is no reason to start with Supermaven today: Cursor carries its completion technology, GitHub Copilot works in VS Code and JetBrains, and Devin Desktop (formerly Windsurf) offers unlimited Tab completions on its free plan.
Verified
