GPT-5.1-Codex-Mini vs o4 Mini (Comparative Analysis)
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Comparative Analysis: GPT-5.1-Codex-Mini vs. o4 Mini
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Overview
o4 Mini was released 7 months before GPT-5.1-Codex-Mini.
 GPT-5.1-Codex-Mini | o4 Mini | |
|---|---|---|
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 | 100K tokens | 100K tokens |
Release Date When this model first became publicly available | November 13, 2025 8 months ago November 13th, 2025 | April 16, 2025 1 year ago April 16th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | June 30, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-5.1-Codex-Mini | o4 Mini | |
|---|---|---|
Input Types Supported input formats | 🖼️Image📝Text | 🖼️Image📝Text📁File |
Reasoning Controls Defaults and configurable reasoning effort | OptionalEffort: 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-Mini is roughly 0.2x less expensive compared to o4 Mini for input tokens and roughly 0.5x less expensive for output tokens.
| GPT-5.1-Codex-Mini | o4 Mini | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.25 per million tokens | $1.10 per million tokens |
Output Token Cost Cost per million output tokens | $2.00 per million tokens | $4.40 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 | $0.02 per million tokens | $0.28 per million tokens |
Benchmarks
Compare relevant benchmarks between GPT-5.1-Codex-Mini and o4 Mini.
| GPT-5.1-Codex-Mini | o4 Mini | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,153 Elo (#67 in Game Dev (43.5% win rate)) | 1,063 Elo (#87 in Game Dev (50.0% win rate)) |
At a Glance
Quick overview of what makes GPT-5.1-Codex-Mini and o4 Mini unique.
GPT-5.1-Codex-Mini 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 $0.25/M input and $2.00/M output tokens. Includes built-in content moderation for safer outputs. Released November 13th, 2025.o4 Mini 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 200K token context window. Reasonably priced at $1.10/M input and $4.40/M output tokens. Includes built-in content moderation for safer outputs. Released April 16th, 2025.Explore More Comparisons
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Best models for coding and development
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Technical analysis and explanations
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