GPT-5 nano
by OpenAI
GPT-5 nano is a model from OpenAI, released on August 7, 2025. It has a 400K-token context window and can generate up to 128K output tokens. API pricing is $0.05 per 1M input tokens and $0.4 per 1M output tokens.
GPT-5 nano is the fastest, cheapest version of GPT-5 from OpenAI. It is well-suited for summarization and classification tasks with average reasoning capabilities and very fast speed.
Key specs
| Provider | OpenAI |
|---|---|
| Release date | 2025-08-07 |
| License | proprietary |
| Context window | 400K tokens |
| Max output | 128K tokens |
| Input price | $0.05 / 1M tokens |
| Output price | $0.4 / 1M tokens |
| Intelligence Score | 19.5 |
Quick answers
What is the context window of GPT-5 nano?
GPT-5 nano has a context window of 400K tokens, with a maximum output of 128K tokens per response.
How much does GPT-5 nano cost?
GPT-5 nano costs $0.05 per 1M input tokens and $0.4 per 1M output tokens through the API.
Is GPT-5 nano open source?
No. GPT-5 nano is a proprietary model from OpenAI (proprietary license).
When was GPT-5 nano released?
OpenAI released GPT-5 nano on August 7, 2025.
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