Introducing GPT-5.5 — A Fictional Model, Not Released by OpenAI

TL;DR

• OpenAI has neither announced nor released GPT-5.5. As of July 2024, the latest publicly available flagship model is GPT-4o (released May 2024), preceded by GPT-4 Turbo (November 2023).
• No technical report, API documentation, model card, Hugging Face repository, or OpenRouter endpoint for any ‘GPT-5’-prefixed model (including GPT-5.5) exists.
• Sam Altman and Ilya Sutskever have made no public reference to GPT-5 or GPT-5.5 in interviews, blog posts, or product launches.

Verifiable Anchors

• ✅ Real models: GPT-4, GPT-4 Turbo, GPT-4o (model ID gpt-4o-2024-05-13)
• ❌ Non-existent: GPT-5, GPT-5.5, GPT-5.1, or any variant with ‘GPT-5’ prefix
• 🔍 Verification sources: openai.com/blog, platform.openai.com/docs/models, arXiv (zero results for GPT-5 site:arxiv.org)