OpenAI tests $100 Pro Codex

OpenAI is testing a new $100 ChatGPT Pro tier built around heavier use of Codex, its coding agent. (help.openai.com) (developers.openai.com) Codex is the tool inside ChatGPT that writes, reviews, and ships code across the web app, command line interface, integrated development environments, and iPhone. OpenAI says it is included with Plus, Pro, Business, and Enterprise and education plans. (help.openai.com) The new lineup now spans Plus at $20 a month, Pro starting at $100 a month, and a separate $200 Pro tier for the heaviest users. OpenAI says the $100 plan is “built for real projects,” while the $200 version is for “heavy lifting.” (help.openai.com) On April 2, OpenAI changed Codex pricing from per-message estimates to token-based billing, the same basic meter used in application programming interfaces. The company says usage is now priced by input, cached input, and output tokens instead of rough message counts. (help.openai.com) That means a short bug fix and a long-running coding agent no longer count the same way. OpenAI says bigger codebases, longer sessions, cloud runs, and tasks that hold more context consume more allowance per request. (help.openai.com 1) (help.openai.com 2) OpenAI is also selling credits as an add-on once a Plus or Pro user hits the plan’s included limit. Users can buy credits manually or switch on auto top-up, which charges the default payment method when the balance falls below a chosen minimum. (help.openai.com) The company’s own rate card says Codex now costs about $100 to $200 per developer each month on average, with large variation by model, automations, fast mode, and the number of running instances. GPT-5.5, for example, is listed at 125 credits per million input tokens and 750 credits per million output tokens. (help.openai.com) For teams, OpenAI has gone further and introduced Codex-only seats with no fixed monthly fee on ChatGPT Business and Enterprise. Those seats have no rate limits and are billed entirely on token consumption. (openai.com) OpenAI says more than 2 million builders now use Codex every week, and Codex usage inside ChatGPT Business and Enterprise has grown sixfold since January 2026. It also says more than 9 million paying business users rely on ChatGPT for work. (openai.com) The immediate tradeoff is simple: lower upfront entry for some heavy users, but less certainty about the final bill once coding agents run longer or in parallel. OpenAI’s pricing pages now frame Codex less like a flat software subscription and more like metered compute. (developers.openai.com) (help.openai.com)