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Correct answer: A. No, because a single file cannot exceed 512MB on any plan
Explanation
The principle — some limits scale with what you pay and some do not, and telling them apart saves you money.
Why the key is correct — OpenAI states that all files uploaded to a GPT or a ChatGPT conversation have a hard limit of 512MB per file. The word doing the work is hard: it is a ceiling on the file, not an allowance attached to your subscription, so a 700MB file is refused on every tier.
Why the others are wrong — upgrading does not raise the per-file ceiling, because that is not what plans change. Splitting the file may well work, but each part is then judged on its own and the plan is irrelevant to it. And the refusal is about size rather than the file being an archive.
Remember this — what a paid plan does change is the rate and the volume: how often you can upload, and how many files a project can hold. Before upgrading to fix an upload problem, work out whether you hit a rate limit or a hard ceiling, because only the first one moves.
Sources — OpenAI's File Uploads FAQ.
Sources
“All files uploaded to a GPT or a ChatGPT conversation have a hard limit of 512MB per file.”
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