What is the context window of GPT-5 Chat?

GPT-5 Chat has a context window of 128K tokens.

When was GPT-5 Chat released?

GPT-5 Chat was released on 2025-10-01.

Name: GPT-5 Chat
Author: OpenAI

gpt-5-chat

ProprietaryMultimodal

GPT-5 Chat is OpenAI's conversational variant of GPT-5 designed for advanced multimodal, context-aware enterprise conversations at 128K context.

GPT-5 Chat has a 128K-token context window.

VisionMultimodalReasoningFunction CallingTool UseStructured OutputsCode Execution

FamilyGPT-5

Released2025-10-01

Context128K

ArchitectureDecoder Only

Specializationgeneral

LicenseProprietary

Trainingpretrained

Cutting-edge research and development.

San Francisco, California, United States

Founded 2015