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Hi there, I’m trying to use an MCP in ChatGPT with GPT 5.4 pro, but it’s not working. I’ve found that the MCP works completely fine when I switch to instant. Any advice on how to fix this?
Hey @Tristan_Morris! Yeah, I get the mix-up 
This is what’s happening at the moment: Apps, Memory, Canvas, and image generation aren’t available on the 5.4 PRO version, which is why you’re seeing the difference compared to Instant.
You can also review this helpful article for more clarification: GPT-5.3 and GPT-5.4 in ChatGPT
-Sunny
Right now, GPT-5.4 Pro doesn’t handle MCP tools properly, which is why it’s not working. Instant mode supports tools better, so it works fine there.