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ft-gpt-4.1-nano-2025-04-14 has been retired

See the change on the model page

What to doRequests to ft-gpt-4.1-nano-2025-04-14 now fail. Switch to gpt-5.6-luna.
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OpenAI
Source
the model page on AIWire
Models
ft-gpt-4.1-nano-2025-04-14

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