An important feature is the introduction of tool search, which provides models with a "lightweight list of available tools along with a tool search capability", thereby Making MCP Great Again!

Remember when everyone was predicting that GPT-5 would take over the planet?

Honestly at this point I just want to know if it follows complex instructions better than 5.1. The benchmark numbers stopped meaning much to me a while ago - real usage always feels different.

> When toggled on, /fast mode in Codex delivers up to 1.5x faster token velocity with GPT‑5.4. It’s the same model and the same intelligence, just faster.

I hate these blog posts sometimes. Surely there's got to be some tradeoff. Or have we finally arrived at the world's first "free lunch"? Otherwise why not make /fast always active with no mention and no way to turn it off?

So desperate how they're bumping out these 'updates'

Not a single comparison between 5.4 and Gemini or Claude. OpenAI continues to fall further behind.

Quick: let's release something new that gives the appearance that we're still relevant

Benchmarks barely improved it seems