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GPT-5.5
Developed by OpenAI
Modality: Multimodal
•
Context: 1.05M
•
API-only
Model decision flow
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Overview
GPT-5.5 is OpenAI's most advanced model as of April 2026, featuring a 1.05 million token context window in the API (256k-400k in ChatGPT depending on tier), integrated reasoning capabilities with adjustable effort levels, and state-of-the-art performance across coding, math, writing, and multimodal tasks. It succeeds GPT-5 and GPT-5.1, offering significant improvements in instruction following and agentic workflows.
Model Specifications
Provider:
OpenAI
Modality / Type:
Multimodal
Pricing Model:
API-only
Context Window:
1.05M
Release Date:
Apr 23, 2026
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