Access is checked against your account before a question runs:

• Personal Taster has a finite per-account question cap and the standard reasoning model. Philosophical and User Defined modes are not available on a capped Taster account.
• Full Personal removes the Taster question cap and enables the current Ask modes and eligible reasoning-model choices. Premium reasoning remains subject to the allowance shown by the Ask surface.
• Enterprise access depends on the member's company role and any reasoning-model grant controlled by the account owner or manager.

Your plan and subscription state are shown at Account & billing. The Ask surface explains a locked choice or exhausted allowance before the run begins.