GPT-5.1-Codex-Max vs GPT-5 Pro (Comparative Analysis)
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Comparative Analysis: GPT-5.1-Codex-Max vs. GPT-5 Pro
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Overview
GPT-5 Pro was released 1 month before GPT-5.1-Codex-Max.
 GPT-5.1-Codex-Max | GPT-5 Pro | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 400K tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens | 128K tokens |
Release Date When this model first became publicly available | December 4, 2025 7 months ago December 4th, 2025 | October 6, 2025 9 months ago October 6th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | September 30, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-5.1-Codex-Max | GPT-5 Pro | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image | 🖼️Image📝Text📁File |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: Extra High, High, Medium, LowDefault: Medium | Always enabledEffort: HighDefault: High |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Pricing
GPT-5.1-Codex-Max is roughly 0.08x less expensive compared to GPT-5 Pro for input tokens and roughly 0.08x less expensive for output tokens.
| GPT-5.1-Codex-Max | GPT-5 Pro | |
|---|---|---|
Input Token Cost Cost per million input tokens | $1.25 per million tokens | $15.00 per million tokens |
Output Token Cost Cost per million output tokens | $10.00 per million tokens | $120.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.13 per million tokens | Not specified |
At a Glance
Quick overview of what makes GPT-5.1-Codex-Max and GPT-5 Pro unique.
GPT-5.1-Codex-Max by OpenAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 400K token context window. Reasonably priced at $1.25/M input and $10.00/M output tokens. Includes built-in content moderation for safer outputs. Released December 4th, 2025.GPT-5 Pro by OpenAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 400K token context window. Premium pricing at $15.00/M input and $120.00/M output tokens. Includes built-in content moderation for safer outputs. Released October 6th, 2025.Explore More Comparisons
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