OpenAI Just Dropped GPT-5.5 — And Released It on Amazon at the Same Time. Here’s What Actually Changed.
OpenAI is releasing models faster than most companies ship software updates. GPT-5.5 dropped April 23 — six weeks after GPT-5.4. A day later, Microsoft's seven-year exclusive lock on OpenAI ended and GPT-5.5 went live on Amazon Bedrock. Here's what changed, what it