Source record

Published by Amp News (ampcode.com) (T1 source). The original is at https://ampcode.com/news/gpt-5.3-codex.

Pipeline notes

The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.

Amp announces GPT-5.3-Codex now powers its 'deep mode' in the Amp CLI and editor extension, succeeding GPT-5.2-Codex. The post claims the model now judges when to stop, shifting the bottleneck from the agent to the user's instructions. Activation: Ctrl-O then 'mode: use deep' in the CLI, or select deep mode in the extension.

First-party release with a concrete command to switch modes; relevant for Amp users benchmarking the new model against its predecessor.

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