What is the context window of GPT-5.5?

GPT-5.5 has a context window of 1M tokens.

How much does GPT-5.5 cost?

GPT-5.5 is available at $5/1M input tokens through OpenAI API.

When was GPT-5.5 released?

GPT-5.5 was released on 2026-04-23.

Which providers offer GPT-5.5?

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

What benchmarks has GPT-5.5 been tested on?

GPT-5.5 has been evaluated on 2 benchmarks, including Google-Proof Q&A, SWE-bench Pro.

GPT-5.5

Name: GPT-5.5
Author: OpenAI

ProprietaryMultimodal

About

GPT-5.5 is OpenAI's fully retrained agentic model, released April 23, 2026. Optimized for agentic coding, computer use, knowledge work, and early scientific research. Achieves 82.7% on Terminal-Bench 2.0, 84.9% on GDPval, and 58.6% on SWE-Bench Pro. Individual factual claims are 23% more likely to be correct versus GPT-5.4, with factual errors 3% less frequent. Uses fewer tokens than GPT-5.4 for equivalent tasks. Supports text and image inputs. Available to ChatGPT Plus, Business, and Enterprise subscribers; API access coming soon. Model ID: gpt-5.5.