It does say "Codex is included in your ChatGPT Free, Go, Plus, Pro, Business, or Enterprise plan." at the top of the page. Just scroll to the Pro (last tier) section for that detail.
I'm not sure why we are even arguing here, you can go into Codex or ChatGPT Work and start using 5.6. It'll start draining your weekly Codex limit. There's no unlimited 5.6 in Codex.
I'm just going by what I see on the linked page. Under the Pro section ($100+) it says unlimited 5.6, and Codex usage is included in all tiers. So I can only conclude that unlimited 5.6 is available in Codex (for $100+/month). If that isn't the case then may want to contact support.
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> Maximum Codex tasks
> ...
> Unlimited GPT-5.6 and file uploads
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"Expanded projects, tasks, and custom GPTs"
Do you have custom GPTs in Codex?
This is just the generic ChatGPT plan comparison, but under the Codex url.
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