Claude Opus 4.5 vs GPT-5.1-Codex-Max (Comparative Analysis)
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Comparative Analysis: Claude Opus 4.5 vs. GPT-5.1-Codex-Max
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Overview
Claude Opus 4.5 was released 10 days before GPT-5.1-Codex-Max.
 Claude Opus 4.5 |  GPT-5.1-Codex-Max | |
|---|---|---|
Model Provider The organization behind this AI's development | Anthropic | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 200K tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 64K tokens | 128K tokens |
Release Date When this model first became publicly available | November 24, 2025 8 months ago November 24th, 2025 | December 4, 2025 8 months ago December 4th, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Claude Opus 4.5 | GPT-5.1-Codex-Max | |
|---|---|---|
Input Types Supported input formats | 📁File🖼️Image📝Text | 📝Text🖼️Image |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Always enabledEffort: Extra High, High, Medium, LowDefault: Medium |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Claude | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Pricing
Claude Opus 4.5 is roughly 4.0x more expensive compared to GPT-5.1-Codex-Max for input tokens and roughly 2.5x more expensive for output tokens.
| Claude Opus 4.5 | GPT-5.1-Codex-Max | |
|---|---|---|
Input Token Cost Cost per million input tokens | $5.00 per million tokens | $1.25 per million tokens |
Output Token Cost Cost per million output tokens | $25.00 per million tokens | $10.00 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 | $0.50 per million tokens | $0.13 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $6.25 per million tokens | Not specified |
1-Hour Cache Write Cost Cost to cache input tokens for one hour | $10.00 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Claude Opus 4.5 and GPT-5.1-Codex-Max.
| Claude Opus 4.5 | GPT-5.1-Codex-Max | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,272 Elo (#27 in UI Component (58.5% win rate)) | Benchmark not available. |
At a Glance
Quick overview of what makes Claude Opus 4.5 and GPT-5.1-Codex-Max unique.
Claude Opus 4.5 by Anthropic understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 200K token context window. Premium pricing at $5.00/M input and $25.00/M output tokens. Includes built-in content moderation for safer outputs. Released November 24th, 2025.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. Released December 4th, 2025.Explore More Comparisons
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🚀Programming
Best models for coding and development
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Models optimized for creative writing
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Content creation and marketing tasks
💻Technology
Technical analysis and explanations
🔬Science
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