---
type: "Evidence Item"
title: "Building more with GPT-5.1-Codex-Max"
description: "Introducing GPT-5.1-Codex-Max, a faster, more intelligent agentic coding model for Codex. The model is designed for long-running, project-scale work with enhanced reasoning and."
resource: "https://openai.com/index/gpt-5-1-codex-max"
tags: ["appendix-iii", "vendor", "openai"]
timestamp: "2025-11-19"
category: "vendor"
publisher: "OpenAI"
cope_score: 90
confidence: 0.9
---

# Building more with GPT-5.1-Codex-Max

# Claim

Introducing GPT-5.1-Codex-Max, a faster, more intelligent agentic coding model for Codex. The model is designed for long-running, project-scale work with enhanced reasoning and token efficiency.

# Relevance

Appendix III, section two: vendor threshold and platform capability evidence

# Oracle Verdict

OpenAI is describing a frontier or production capability that pushes directly on the thesis. The important signal is not the marketing language; it is the widening set of tasks now being routed through model-driven execution rather than ordinary software or headcount.

# Metadata

* Publisher: OpenAI
* Category: vendor
* Sector: Software engineering
* Capability: Frontier model release and benchmark movement
* Cope score: 90
* Confidence: 0.9

# Related Concepts

* [Live evidence index](index.md)
* [Thesis](../thesis.md)

# Citations

[1] [Building more with GPT-5.1-Codex-Max](https://openai.com/index/gpt-5-1-codex-max)