We found 5.4 to dramatically improve intelligence per token leading to more consistency, improved accuracy, and better steerability.
GPT-5.4 is our most factual and efficient model: fewer tokens, faster speed.
In ChatGPT, GPT-5.4 Thinking has improved deep web research, better context retention when it thinks for longer—and oh—you can now interrupt the model and add instructions or adjust its direction mid-response.
Steering is available this week on Android and web. iOS coming soon.