GPT-5 Nano vs Phi 4 (Comparative Analysis)
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Comparative Analysis: GPT-5 Nano vs. Phi 4
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Overview
Phi 4 was released 6 months before GPT-5 Nano.
 GPT-5 Nano |  Phi 4 | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | Microsoft |
Input Context Window Maximum input tokens this model can process at once | 400K tokens | 16.4K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens | 16.4K tokens |
Release Date When this model first became publicly available | August 7, 2025 1 year ago August 7th, 2025 | January 10, 2025 1 year ago January 10th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | May 31, 2024 | June 30, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-5 Nano | Phi 4 | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File | 📝Text |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: High, Medium, Low, MinimalDefault: Medium | Not reported |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | Other |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation | Function Calling✓Structured OutputReasoning ModeContent Moderation |
Open Source Model availability | Proprietary | Available on HuggingFace → |
Pricing
GPT-5 Nano is roughly 0.7x less expensive compared to Phi 4 for input tokens and roughly 2.9x more expensive for output tokens.
| GPT-5 Nano | Phi 4 | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.05 per million tokens | $0.07 per million tokens |
Output Token Cost Cost per million output tokens | $0.40 per million tokens | $0.14 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | Not specified |
Cache Read Cost Cost to reuse cached input tokens | $0.0050 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between GPT-5 Nano and Phi 4.
| GPT-5 Nano | Phi 4 | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,122 Elo (#86 in Website (48.9% win rate)) | Benchmark not available. |
At a Glance
Quick overview of what makes GPT-5 Nano and Phi 4 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.Phi 4 by Microsoft generates structured data. It can handle standard conversations with its 16.4K token context window. Very affordable at $0.07/M input and $0.14/M output tokens. Released January 10th, 2025.Explore More Comparisons
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Compare Phi 4 with:
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