GPT-5 Nano vs o3 Mini High (Comparative Analysis)
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Comparative Analysis: GPT-5 Nano vs. o3 Mini High
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Overview
o3 Mini High was released 5 months before GPT-5 Nano.
 GPT-5 Nano | o3 Mini High | |
|---|---|---|
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 | August 7, 2025 11 months ago August 7th, 2025 | February 12, 2025 1 year ago February 12th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | May 31, 2024 | October 31, 2023 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-5 Nano | o3 Mini High | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File | 📝Text📁File |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: High, Medium, Low, MinimalDefault: 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 Nano is roughly 0.05x less expensive compared to o3 Mini High for input tokens and roughly 0.09x less expensive for output tokens.
| GPT-5 Nano | o3 Mini High | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.05 per million tokens | $1.10 per million tokens |
Output Token Cost Cost per million output tokens | $0.40 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 | $0.0050 per million tokens | $0.55 per million tokens |
Benchmarks
Compare relevant benchmarks between GPT-5 Nano and o3 Mini High.
| GPT-5 Nano | o3 Mini High | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | Benchmark not available. | 15.6 (Artificial Analysis index; higher is better) |
Coding Index Programming performance across independent evaluations | Benchmark not available. | 16.3 (Artificial Analysis index; higher is better) |
Agentic Index Ability to complete multi-step agentic tasks | Benchmark not available. | 1.7 (Artificial Analysis index; higher is better) |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,132 Elo (#80 in Website (48.9% win rate)) | Benchmark not available. |
At a Glance
Quick overview of what makes GPT-5 Nano and o3 Mini High unique.
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.o3 Mini High by OpenAI 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 February 12th, 2025.Explore More Comparisons
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