Amp 2026.03.26

Amp 2026.03.26 was released on .

Summary

GPT‐5.4 in Deep GPT-5.4 now powers Amp's deep mode. It's the best model in the world right now. It's faster than GPT-5.3-Codex and still as great at coding. But, out of the box, GPT-5.4 was too cha...

Release Context

  • This was the 16th Amp release of 2026 tracked by Havoptic.
  • It shipped 21 days after Amp 2026.03.05 (March 5, 2026).

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Release Notes

GPT‐5.4 in Deep GPT-5.4 now powers Amp's deep mode. It's the best model in the world right now. It's faster than GPT-5.3-Codex and still as great at coding. But, out of the box, GPT-5.4 was too chatty. That's not what we want for deep; it's not a pair programmer, it's supposed to go off and solve the problem. So we tuned GPT-5.4 to behave like GPT-5.3-Codex. Once we had that, we started to use it exclusively; even for interactive tasks. We run it at very high reasoning (deep^3) and still prefer it when we need fast interaction and fast reaction. It takes steering better than GPT-5.3-Codex. To use it: open the command palette with Ctrl-O and run the command mode: use deep in the Amp CLI, or select deep mode in the Amp editor extension's prompt field. By default it uses deep^2, you can switch to deep^3 by hitting Opt-D.

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