Try gpt-5.3-codex-spark - it's 1000 TPS and from my experience more capable than 5.4 mini.
If you have a subscription it's a different pool of usage.
Used it, very fast but tiny context window and doesn't have good reasoning. (good for quick simple code changes)
Used it, very fast but tiny context window and doesn't have good reasoning. (good for quick simple code changes)