OpenAI AI Updates: May 11, 2026

1. GPT-5.5 Real-World Costs Run 49–92% Higher Than Predecessor

OpenAI. Despite OpenAI’s claim that shorter outputs would offset higher per-token rates on GPT-5.5, third-party usage data shows real-world spend has climbed 49–92% versus GPT-5.3 depending on input length. The increase is sharpest for prompts above the 272K-token threshold, which incur a 2× input / 1.5× output multiplier for the full session. Source