---
title: GPT 5.1 Codex Max API | LLM | ModelsLab
description: Agentic coding assistant for large codebases: speeds multi-file refactors, supports streaming, function-calls, image I/O, long-context compaction, and repo-aware testing (high-accuracy, lower token use).
url: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt-5.1-codex-max
canonical: https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt-5.1-codex-max
type: product
component: Playground/LLM/Index
generated_at: 2026-04-01T09:58:11.103205Z
---

# GPT 5.1 Codex Max API | LLM | ModelsLab

> Agentic coding assistant for large codebases: speeds multi-file refactors, supports streaming, function-calls, image I/O, long-context compaction, and repo-aware testing (high-accuracy, lower token use).

**Navigation**: [Home](https://modelslab-frontend-v2-927501783998.us-east4.run.app) > [Models](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models) > [Open Ai](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai) > [GPT 5.1 Codex Max](https://modelslab-frontend-v2-927501783998.us-east4.run.app/models/openai/gpt-5.1-codex-max)


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*This markdown version is optimized for AI agents and LLMs.*

**Links:**
- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
- [Blog](https://modelslab.com/blog)

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*Generated by ModelsLab - 2026-04-01*