GPT-5

Deprecated

OpenAI · August 2025

OpenAI is retiring this model on 11 December 2026. After that date it will not be available for new work.

The first GPT-5: conversation, code, hard problems and multi-step work.

Best for: Coding, deep reasoning, and agent workflows
Superseded by: GPT-5.1

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
September 2024
its training cutoff

Modalities

TextInput and output
ImageInput only
AudioNot supported
VideoNot supported

Reasoning effort

Minimal
Low
Medium
High

Features

StreamingSupported
Function callingSupported
Structured outputsSupported
Fine-tuningNot supported

Tools

Web searchSupported
Hosted shellNot supported
Apply patchNot supported
Tool searchNot supported

Ready to try it?

Polymeti is currently invite-only.

Request an invitation

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