What is the context window of GPT-5.5 Instant?

GPT-5.5 Instant has a context window of 400K tokens.

What is the max output of GPT-5.5 Instant?

GPT-5.5 Instant can generate up to 128,000 output tokens.

How much does GPT-5.5 Instant cost?

GPT-5.5 Instant is available at $1.50/1M input tokens through OpenAI API.

When was GPT-5.5 Instant released?

GPT-5.5 Instant was released on 2026-05-05.

Which providers offer GPT-5.5 Instant?

GPT-5.5 Instant is available from 1 provider: OpenAI API.

GPT-5.5 Instant

Name: GPT-5.5 Instant
Author: OpenAI

gpt-5.5-instant

ProprietaryMultimodal

About

GPT-5.5 Instant is OpenAI's latest Instant model used in ChatGPT, released May 5, 2026 as the new default ChatGPT model and exposed in the API as chat-latest. OpenAI says the update improves factuality, image analysis, STEM answers, web-search decisions, personalization from past chats/files/connected Gmail, and concise conversational style. OpenAI reports 52.5% fewer hallucinated claims than GPT-5.3 Instant on high-stakes prompts and 37.3% fewer inaccurate claims on difficult conversations flagged for factual errors.

GPT-5.5 Instant has a 400K-token context window.

GPT-5.5 Instant input tokens at $1.5/1M, output at $6/1M.