GPT-5 Nano Model Specs, Costs & Benchmarks (July 2026)
GPT-5 Nano, developed by OpenAI, features a context window of 400K tokens. The model costs $0.05 per million tokens for input and $0.40 per million tokens for output. It was released on August 7, 2025, and has achieved impressive scores in various benchmarks.
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Overview
 GPT-5 Nano | |
|---|---|
Model Provider The organization behind this AI's development | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens |
Release Date When this model first became publicly available | August 7, 2025 11 months ago August 7th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | May 31, 2024 |
Pricing
| GPT-5 Nano | |
|---|---|
Input Token Cost Cost per million input tokens | $0.05 per million tokens |
Output Token Cost Cost per million output tokens | $0.40 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.0050 per million tokens |
Capabilities & Features
| GPT-5 Nano | |
|---|---|
Input Types Supported input formats | textimagefile |
Output Types Supported output formats | text |
Tokenizer Text encoding system | GPT |
Key Features Advanced capabilities | ✓ Function Calling✓ Structured Output✓ Reasoning Mode✓ Content Moderation |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: High, Medium, Low, MinimalDefault: Medium |
Benchmarks
| GPT-5 Nano | |
|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,128 Elo (#82 in Website (48.9% win rate)) |
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