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Amp changed the Dial feature: when a ChatGPT subscription is linked, the low, medium, and high modes now exclusively use OpenAI models (GPT-5.6 Terra and GPT-5.6 Sol), billed to the subscription. Previously, these modes used a mix of models including GLM-5.2, Claude Fable, and Haiku, which were billed to Amp credits. The ultra mode remains unchanged, running Claude Fable on credits.
From the source
We changed the Dial . Link a ChatGPT subscription and low , medium , and high only use OpenAI models
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