GPT-5 Nano
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...
GPT-5 Nano specs and pricing
- Provider: OpenAI
- Released: August 7, 2025
- Context window: 400K tokens
- Max output: 128K tokens
- Input: text, images, files
- Output: text
- Price: $0.05 input / $0.40 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
FAQ
- How much does GPT-5 Nano cost? GPT-5 Nano costs $0.05 per million input tokens and $0.40 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 0.2 credits ($1 = 100 credits).
- What is the context window of GPT-5 Nano? GPT-5 Nano can read up to 400K tokens at once and write up to 128K tokens in one reply.
- Can I use GPT-5 Nano without coding? Yes. In todo.is you pick GPT-5 Nano as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.