GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger...
| Provider | openai |
|---|---|
| Input price | $0.050 / 1M tokens |
| Output price | $0.400 / 1M tokens |
| Context window | 400k tokens |
| Max output | 128k tokens |
| Modalities | text, image, file |
| Model ID | openai/gpt-5-nano |
A 1,000-token prompt with a 500-token answer on OpenAI: GPT-5 Nano costs roughly $0.00025. Use the OpenRouter cost calculator to price your own prompt across 400+ models, or the token counter to measure prompt length first.
PromNest stores your prompt library and lets you run any prompt on OpenAI: GPT-5 Nano with your own OpenRouter key — including side-by-side comparison with other models. Browse 1,000+ ready-made prompt templates to start.