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Exploring Development Techniques with GPT-5.1-Codex-Max

https://simonwillison.net/2025/Nov/19/gpt-51-codex-max/#atom-everything(simonwillison.net)
Submitted by alonkatz•11/24/2025
🤖 AI Summary85% confidence

The article discusses the release of OpenAI's new model, GPT-5.1-Codex-Max, which is designed for long-running coding tasks and improves upon context management through a process called compaction. This model replaces the previous GPT-5.1-Codex as the default in Codex environments, enhancing its capabilities for complex coding tasks.

Key insight: GPT-5.1-Codex-Max is specifically optimized for agentic coding tasks.
Technique: Compaction
GPT-5.1-Codex-MaxCodex CLI

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