From the source

GPT‐5.4 in Deep

Amp announced that GPT-5.4 now powers its deep mode.

Model update

The model was tuned to behave like GPT-5.3-Codex and is faster and better at coding.

Users can access it via the command palette or editor extension, with options for deep^2 and deep^3 reasoning levels.

From the source
GPT-5.4 now powers Amp's deep mode .
ampcode.com

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