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  "articleBody": "GPT-5.3-Codex now powers Amp's [deep mode](https://ampcode.com/news/deep-mode).\n\nIt’s a truly impressive model. After using it, we realized: \"[The coding agent is dead](https://ampcode.com/news/the-coding-agent-is-dead).\"\n\nEverything is changing again. With GPT-5.3-Codex, the agent is no longer the bottleneck. Our ability to tell it what to do is.\n\nIn our experience, it's better than GPT-5.2-Codex in every dimension. It still goes deep, but it's learned when to stop.\n\nTo 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.\n",
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  "captured_at": "2026-10-03T23:09:50.514863041+00:00",
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  "content_html": "<p>GPT-5.3-Codex now powers Amp's <a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://ampcode.com/news/deep-mode\">deep mode</a>.</p>\n<p>It’s a truly impressive model. After using it, we realized: &quot;<a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://ampcode.com/news/the-coding-agent-is-dead\">The coding agent is dead</a>.&quot;</p>\n<p>Everything is changing again. With GPT-5.3-Codex, the agent is no longer the bottleneck. Our ability to tell it what to do is.</p>\n<p>In our experience, it's better than GPT-5.2-Codex in every dimension. It still goes deep, but it's learned when to stop.</p>\n<p>To use it: open the command palette with <code>Ctrl-O</code> and run the command <code>mode: use deep</code> in the Amp CLI, or select <code>deep</code> mode in the Amp editor extension's prompt field.</p>\n",
  "content_markdown": "GPT-5.3-Codex now powers Amp's [deep mode](https://ampcode.com/news/deep-mode).\n\nIt’s a truly impressive model. After using it, we realized: \"[The coding agent is dead](https://ampcode.com/news/the-coding-agent-is-dead).\"\n\nEverything is changing again. With GPT-5.3-Codex, the agent is no longer the bottleneck. Our ability to tell it what to do is.\n\nIn our experience, it's better than GPT-5.2-Codex in every dimension. It still goes deep, but it's learned when to stop.\n\nTo 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.\n",
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  "description": "GPT-5.3-Codex now powers Amp's deep mode. It’s a truly impressive model. After using it, we realized: \"The coding agent is dead.\" Everything is changing again. With GPT-5.3-Codex, the agent is no longer the bottleneck. Our ability to tell…",
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  "summary": "GPT-5.3-Codex now powers Amp's deep mode. It’s a truly impressive model. After using it, we realized: \"The coding agent is dead.\" Everything is changing again. With GPT-5.3-Codex, the agent is no longer the bottleneck. Our ability to tell it what to do is. In our experience, it's better than GPT-5.2-Codex in every dimension. It still goes deep, but it's learned when to stop. 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.",
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  "title": "GPT‐5.3‐Codex",
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