GPT-5.5 model family achieves leading position on Artificial Analysis Index for cost-performance

GPT-5.5 spotted via Codex API backdoor, suggesting unofficial release channel for image generation.

OpenAI engineer reveals GPT-5.5 is a Blackwell-native model trained on Nvidia GB200/GB300 NVL72 systems.

Ethan Mollick announces early access to GPT-5.5, praises the Pro version, full writeup forthcoming.

OpenAI announces GPT-5.5 as a new intelligence tier for agents and tool use

Achieved 78.5% score on SWE-Bench coding benchmark

Observed autonomously optimizing an embedding model for Qualcomm NPU for three hours.

OpenAI launches GPT-5.5 with double the pricing of GPT-5.4 at $5/$30 per 1M tokens

Achieved 100% resident identification accuracy in a safety evaluation for a care home smart speaker system.

Released as OpenAI's most capable frontier model with unified coding, reasoning, and computer operation capabilities