GPT-5.1-Codex-Max vs o1-pro (Comparative Analysis)
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Comparative Analysis: GPT-5.1-Codex-Max vs. o1-pro
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Overview
o1-pro was released 8 months before GPT-5.1-Codex-Max.
 GPT-5.1-Codex-Max | o1-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 | 200K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens | 100K tokens |
Release Date When this model first became publicly available | December 4, 2025 7 months ago December 4th, 2025 | March 19, 2025 1 year ago March 19th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | October 31, 2023 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-5.1-Codex-Max | o1-pro | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image | 📝Text🖼️Image📁File |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: Extra High, High, Medium, LowDefault: Medium | Optional |
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 significantly less expensive compared to o1-pro for input tokens and roughly 0.02x less expensive for output tokens.
| GPT-5.1-Codex-Max | o1-pro | |
|---|---|---|
Input Token Cost Cost per million input tokens | $1.25 per million tokens | $150.00 per million tokens |
Output Token Cost Cost per million output tokens | $10.00 per million tokens | $600.00 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 o1-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.o1-pro by OpenAI understands both text and images, offers advanced reasoning, generates structured data. It can handle standard conversations with its 200K token context window. Premium pricing at $150.00/M input and $600.00/M output tokens. Includes built-in content moderation for safer outputs. Released March 19th, 2025.Explore More Comparisons
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