GPT-5.1-Codex-Max Prompting Guide

kept by eddie dec 05, 25

OpenAI recommends migrating to the Codex-Max agentic model using the codex-cli prompt, compacted context, and specific tools for best performance on complex coding tasks.

Building more with GPT-5.1-Codex-Max
OpenAI releases GPT-5.1-Codex-Max, a faster coding model using compaction for long-horizon tasks across multiple context windows.
also on GPT-5.1-Codex-Max, OpenAI, #ai-coding, #developer-tools
Opus 4.6, Codex 5.3, and the post-benchmark era
The latest coding models from OpenAI and Anthropic show marginal benchmark gains but real-world usability differences, with Claude ahead in product experience while Codex edges in coding capability.
also on gpt-5.3-codex, OpenAI, #ai-coding, #developer-tools
GPT-5.3-Codex | Hacker News
OpenAI releases GPT-5.3-Codex, a faster agentic coding model that achieves state-of-the-art results on SWE-Bench Pro and Terminal-Bench 2.0.
also on gpt-5.3-codex, OpenAI, #ai-coding, #developer-tools
Prompt Caching 201
Prompt caching reduces latency by up to 80% and costs by up to 90% by reusing computed key/value tensors for repeated prompt prefixes in OpenAI's API.
also on Responses API, #api, OpenAI, #developer-tools
Build a coding agent with GPT 5.1
OpenAI demonstrates building a GPT-5.1 coding agent that scaffolds NextJS/shadcn apps using shell, web search, apply_patch, and Context7 MCP tools via the Agents SDK and Responses API.
also on Responses API, OpenAI, #open-source, #ai-coding, #developer-tools