---
title: "gpt-5.1-codex-max - Model Details & Comparison"
description: "gpt-5.1-codex-max from OpenAI: capabilities, context limits, pricing, and side-by-side comparisons with alternative models."
url: "https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/openai/gpt-5.1-codex-max"
markdown: "https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/openai/gpt-5.1-codex-max.md"
---

# gpt-5.1-codex-max - Model Details & Comparison

> gpt-5.1-codex-max from OpenAI: capabilities, context limits, pricing, and side-by-side comparisons with alternative models.

## Important Links

- [View MCP Gateway](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/resources/mcp-gateway.md)
- [Features](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/#features)
- [Enterprise](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/enterprise)
- [Pricing](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/pricing.md)
- [Docs](https://docs.getbifrost.ai)
- [GitHub](https://github.com/maximhq/bifrost)
- [Book a Demo](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/book-a-demo)

## About gpt-5.1-codex-max

gpt-5.1-codex-max is a responses model from OpenAI, one of 23 responses models they offer. It is priced at $1.25 per 1M input tokens and $10.00 per 1M output tokens, ranking 15 out of 53 responses models by cost and cheaper than 72% of models in this category. gpt-5.1-codex-max supports vision, function calling, reasoning, web search, prompt caching, structured output. It accepts up to 272K input tokens.

## Specifications

- **OpenAI Provider.**
- **Responses Mode.**
- **272,000 Max Input Tokens.**
- **128,000 Max Output Tokens.**
- **128,000 Max Tokens.**
- **$1.25 / 1M tokens Input Price.**
- **$10.00 / 1M tokens Output Price.**

## Capabilities

gpt-5.1-codex-max supports: Function Calling, Vision, Reasoning, Web Search, Prompt Caching, Parallel Function Calling, Response Schema, Tool Choice, PDF Input.

## gpt-5.1-codex-max Pricing Overview

At $1.25 per 1M input tokens and $10.00 per 1M output tokens, gpt-5.1-codex-max ranks 15 out of 53 responses models by input cost. It is more affordable compared to the median of $2.75 for responses models, and is cheaper than 72% of models in this category.

gpt-5.1-codex-max is one of 23 OpenAI responses models, with support for vision, function calling, reasoning, web search, prompt caching, structured output.

## Models to Compare

Alternatives to gpt-5.1-codex-max with comparable capabilities.

| Model | Provider | Input $/1M | Output $/1M |
| --- | --- | --- | --- |
| codex-mini | Azure | $1.50 | $6.00 |
| gpt-5.1-codex | Azure | $1.38 | $11.00 |
| gpt-5.1-codex-2025-11-13 | Azure | $1.25 | $10.00 |
| gpt-5-codex | Azure | $1.25 | $10.00 |
| gpt-5.1-codex-max | Azure | $1.25 | $10.00 |

- [Compare codex-mini](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/codex-mini.md)
- [Compare gpt-5.1-codex](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/gpt-5.1-codex.md)
- [Compare gpt-5.1-codex-2025-11-13](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/gpt-5.1-codex-2025-11-13.md)
- [Compare gpt-5-codex](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/gpt-5-codex.md)
- [Compare gpt-5.1-codex-max](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/azure/gpt-5.1-codex-max.md)

## Related Resources

- [Calculate gpt-5.1-codex-max costs](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/llm-cost-calculator/provider/openai/model/gpt-5.1-codex-max.md)
- [Check OpenAI status](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/provider-status/openai.md)
- [All OpenAI pricing](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/llm-cost-calculator/provider/openai.md)

## FAQ

### Is gpt-5.1-codex-max cheaper than codex-mini?

Yes. gpt-5.1-codex-max costs $1.25 per 1M input tokens compared to codex-mini's $1.50 per 1M input tokens, making it 20% more affordable. Both are responses models and share support for vision, function calling, reasoning, prompt caching, structured output.

### How does gpt-5.1-codex-max pricing compare to the average responses model?

gpt-5.1-codex-max input pricing is $1.25 per 1M tokens, which is 55% below the median of $2.75 for responses models. It ranks 15 out of 53 responses models by input cost, making it cheaper than 72% of models in this category. For output, it costs $10.00 per 1M tokens compared to the median of $16.50.

### What makes gpt-5.1-codex-max different from other OpenAI models?

Among OpenAI's 23 responses models, gpt-5.1-codex-max ranks 4 by input cost.

### What are the best alternatives to gpt-5.1-codex-max?

The most comparable responses models to gpt-5.1-codex-max are: codex-mini from Azure ($1.50/1M input tokens); gpt-5.1-codex from Azure ($1.38/1M input tokens); gpt-5.1-codex-2025-11-13 from Azure ($1.25/1M input tokens); gpt-5-codex from Azure ($1.25/1M input tokens). These alternatives were selected based on similar capabilities, pricing, and provider diversity. You can compare any of these models in detail using the Bifrost Model Library.

### How do I check if OpenAI is down?

You can monitor OpenAI service health in real time on the Bifrost OpenAI Status page. It tracks current component status, active incidents, and historical reliability data pulled from the official status page every 60 seconds.

### How do I calculate gpt-5.1-codex-max costs?

gpt-5.1-codex-max is priced based on input and output tokens. Use the interactive calculator at the top of this page to estimate costs for your specific workload. Enter your expected input and output tokens volume and the calculator will show the total cost breakdown. For reference, processing 1M input tokens costs $1.25 and generating 1M output tokens costs $10.00.

## Related Resources

- [OpenAI models](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/provider/openai.md)
- [Model library](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library.md)
- [LLM cost calculator](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/llm-cost-calculator.md)
- [Docs: Bifrost docs](https://docs.getbifrost.ai)
- [GitHub: maximhq/bifrost](https://github.com/maximhq/bifrost)
- [Pricing: Bifrost pricing](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/pricing.md)
- [Enterprise: Bifrost enterprise](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/enterprise)
- [Book a Demo: Bifrost demo](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/book-a-demo)
- [Resources: Bifrost resources](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/resources.md)

---

*This is a markdown version of [https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/openai/gpt-5.1-codex-max](https://maxim-root-proxy-preview.getmaxim.workers.dev/bifrost/model-library/compare/openai/gpt-5.1-codex-max) for AI/LLM consumption.*