I’m seeing similar reports from other users. It looks like GPT-5.5 has a much higher ‘reasoning weight’ or a different quota accounting logic compared to previous versions.
To help the community/support narrow this down, could you check a few things:
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Plan Mode vs. Direct: Are you using the new ‘Plan Mode’? It often runs background checks that burn quota faster.
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Context Window: GPT-5.5 might be pulling in more files/context by default now, which inflates the token count.
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Usage Dashboard: Does the ‘Usage’ page in your settings show the same 25% drop, or is it only the UI counter in Codex?
You should definitely submit a ticket through the Help Center. If a task that used 2% now takes 25%, it’s likely a miscalculation in how the 5-hour window handles the high-reasoning tokens of the new model