Specifications
Lab OpenAI
Type CLOSED
Released April 24, 2026
Context Window 1.0M tokens
Training Cutoff 2025-10
Status ACTIVE
Pricing
INPUT
$5.00
per 1M tokens
OUTPUT
$30.00
per 1M tokens
Capabilities 4
textvisiontool-useagentic
About
GPT-5.5 is OpenAI’s most capable general-purpose model, released alongside a Pro tier at $30/$180. It replaces GPT-4o as the default flagship and is the first GPT model to offer a 1M token context window.
OpenAI Dispatches 2 total
MAY 15 OpenAI and Microsoft restructure partnership, cap revenue share OpenAI and Microsoft restructured their partnership in April, capping revenue share through 2030. The deal reshapes the financial relationship between the $13 billion investor and its most important portfolio company. CNBC · Money Moves
MAY 15 Musk skips closing arguments for China trip with Trump Closing arguments began May 14 in Musk v. Altman. Musk was absent — flew to China with Trump on Air Force One despite being subject to recall. His lawyer apologized to the jury, then said five witnesses under oath called Altman a liar. OpenAI's lawyer called it unexpected for a recall witness to leave the country. CNBC · Policy Wire