GPT-5.4 rollout: early tool-calling regressions and broken Computer Use reports
OpenAI’s GPT-5.4 is rolling out, and early users report broken Computer Use and changed tool-calling behavior. Multiple developer threads indicate GPT-5.4 became available and is behaving differently with tools. One forum post details "weird tool behaviour" after switching models, including unexpected arguments and schema issues ([OpenAI Developer Community](https://community.openai.com/t/gpt-5-4-release-weird-tool-behaviour/1375860)). Another thread says Computer Use fails entirely with gpt-5.4-pro, preventing the feature from activating ([OpenAI Developer Community](https://community.openai.com/t/computer-use-is-not-working-with-the-gpt-5-4-pro/1376011)). An [Instagram post](https://www.instagram.com/p/DVmbewQlP-G/) also appears to announce the GPT-5.4 release, but detailed docs aren’t linked here.