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BYOK
Audio follows the same BYOK/PTB selection as chat: stored BYOK is used by default when available, otherwise PTB is used when available. SendPlanck-Billing-Mode: ptb or Planck-Billing-Mode: byok to force a mode for a specific request.
X-Provider-Key and Planck-Provider-Key are still supported as explicit per-request BYOK overrides.
Audio requests are usage-bearing and should flow through gateway cost extraction, billing, and logging when the provider returns enough usage information.