The models are now available in the API and Playground. Pricing doubled compared to GPT-5.4 — $5 per 1M input tokens and $30 per 1M output tokens.
OpenAI promises a fundamentally different level of reasoning and code quality. They're also hinting the model got "smarter" about token usage, so the actual bill per task might not necessarily go up.
Why it matters
Doubling the price is an unusual move for a market where LLMs are generally getting cheaper. It signals that OpenAI is betting on flagship quality rather than competing on price.
Try the new models in OpenAI Playground.