GPT-5.1-Codex vs GPT-5 Nano (Comparative Analysis)
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Comparative Analysis: GPT-5.1-Codex vs. GPT-5 Nano
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Overview
GPT-5 Nano was released 3 months before GPT-5.1-Codex.
 GPT-5.1-Codex | GPT-5 Nano | |
|---|---|---|
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 | November 13, 2025 8 months ago November 13th, 2025 | August 7, 2025 11 months ago August 7th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | May 31, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-5.1-Codex | GPT-5 Nano | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image | 📝Text🖼️Image📁File |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: High, Medium, LowDefault: Medium | Always enabledEffort: High, Medium, Low, MinimalDefault: Medium |
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 is roughly 25.0x more expensive compared to GPT-5 Nano for input tokens and roughly 25.0x more expensive for output tokens.
| GPT-5.1-Codex | GPT-5 Nano | |
|---|---|---|
Input Token Cost Cost per million input tokens | $1.25 per million tokens | $0.05 per million tokens |
Output Token Cost Cost per million output tokens | $10.00 per million tokens | $0.40 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 | $0.13 per million tokens | $0.0050 per million tokens |
Benchmarks
Compare relevant benchmarks between GPT-5.1-Codex and GPT-5 Nano.
| GPT-5.1-Codex | GPT-5 Nano | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,209 Elo (#44 in Data Viz (50.7% win rate)) | 1,129 Elo (#81 in Website (48.9% win rate)) |
At a Glance
Quick overview of what makes GPT-5.1-Codex and GPT-5 Nano unique.
GPT-5.1-Codex 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 November 13th, 2025.GPT-5 Nano 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. Very affordable at $0.05/M input and $0.40/M output tokens. Includes built-in content moderation for safer outputs. Released August 7th, 2025.Explore More Comparisons
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Technical analysis and explanations
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