GPT-5.4 Thinking System Card capability update

AI Impact Summary

This CAPABILITY update signals an enhancement to the GPT-5.4 Thinking System Card, suggesting deeper reasoning and more robust planning within the model. For engineering teams, expect improved performance on multi-step tasks and complex workflows, but plan to revalidate prompts and evaluation suites to measure gains. The change may affect use cases like code reasoning, data analysis, and decision workflows, where the Thinking System Card steers cognitive steps.