The PPQ team is currently waiting on GPT5 access via the openAI API...
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And I got a weird error (just a red X) when trying to do a query with "horizon-beta".
Yes, we lost access to horizon beta the moment GPT5 launched. Kind of confirms that horizon beta was the pre-release of GPT5.
But to your point yea we should have a more expressive error when a model gets removed.