How to run and review a GPT-5.5 multi-file change in Codex
GPT-5.5 remains available to eligible API-key Codex projects. Set a real two-file coding task, verify the active model, then inspect tests and the complete patch before acceptance.
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OpenAI Pro and Codex usage
Explore BIG CHANGE reporting on OpenAI Pro and Codex usage: what changed, how it works and why it matters.
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Set up a Codex Cloud environment for a repository
Connect a GitHub repository, publish a reusable Codex Cloud environment and learn how isolated tasks continue across desktop, web and mobile. This documented guide explains access, network, credentials and cost; BIG CHANGE has not tested it.
ChatGPT Pro $100, $200 and $500: how Codex usage compares
OpenAI lists three Pro prices but no exact new $200 or $500 Codex quotas. This guide compares the dated allowance evidence and explains Pro 500's Astra Ultrafast access.
OpenAI says Pro $200 subscriptions are available with a lower allowance
OpenAI says new Pro $200 subscriptions are available at $200/month with a lower allowance. Sottiaux said reopening was planned for Sept. 30, but a later Help Center update that day said subscriptions were already available.
Did OpenAI halve GPT-6 Sol's Codex quota? The math does not prove it
A Codex subscriber reports lower API-equivalent value after GPT-6 Sol's price cut. That figure alone cannot establish fewer tokens or less work per subscription.