GPT-5 Nano

Made by OpenAI · Text model · gpt-5-nano

Fastest, most cost-efficient version of GPT-5

Private by design

When you use GPT-5 Nano in Polymeti, your browser sends the message to OpenAI directly, with your own API key. Nothing passes through a Polymeti server.

We never see your conversation.
Your API key is stored in your browser, not on our servers.
Your chat history lives on your device. Back it up to your own Google Drive if you want it on more than one.

What it can do

Context window

400,000 tokens

≈ 300,000 words · about 1,200 pages
Max output

128,000 tokens

≈ 96,000 words in a single answer
Knowledge cutoff

May 2024

its training cutoff

Reads images you attach
Uses tools

Modalities

Text Input and output
Image Input only
Audio Not supported
Video Not supported

Reasoning effort

Minimal
Low
Medium
High

Features

Streaming Supported
Function calling Supported
Structured outputs Supported
Fine-tuning Not supported

Ready to try it?

Polymeti is currently invite-only.

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Bring your own API key · Your chats stay in your browser