OpenAI: GPT-5 Nano

OpenAIID: openai/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 counterparts, it retains key instruction-following and safety features. It is the successor to GPT-4.1-nano and offers a lightweight option for cost-sensitive or real-time applications.

Pricing per 1M Tokens

Input (Prompt)$0.05
Output (Completion)$0.40
Cache Read<$0.01
Cache WriteFree
ImageN/A

Specifications

Context Length400K
Max Output Tokens128K
Input ModalitiesText + Image + File
Output ModalitiesText
TokenizerGPT
Instruct TypeN/A
Top Provider Context400K
Top Provider Max Output128K
ModeratedYes

Compare this model

See how OpenAI: GPT-5 Nano stacks up against other models.

vs OpenAI: GPT-5.4 Nanovs OpenAI: GPT-5.4 Minivs OpenAI: GPT-5.4 Provs OpenAI: GPT-5.4vs OpenAI: GPT-5.3 Chat

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Last updated: March 23, 2026

First tracked: March 23, 2026