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API preview: generation providers are not connected. An authenticated request can return 503 without creating a task or charging credits.

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Fallback is opt-in

fallback defaults to false. In the first release, each image/video item can try one eligible low-cost channel and, with fallback enabled, one official channel. Each item has at most two generation attempts. With fallback off, an unavailable low-cost route does not silently become a more expensive official call. With fallback on, the official route must support the full input before acceptance.

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Compatibility before price

Providers can use different field names, units, enums, and supported combinations for the same model. APIstable maps a versioned public schema to each eligible provider. Renaming duration_seconds to seconds is a mapping; dropping audio or changing resolution is not.

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A timeout is not a safe failure

A confirmed rejection before acceptance or an eligible terminal provider failure can trigger fallback. An unknown submission, running generation, content-policy rejection, or invalid input cannot be treated as a free pass to submit elsewhere. Unknown results enter reconciliation. If a final decision releases the credits, a late success cannot silently recharge the account.