In my experience, the model's performance in silly tasks like these is usually (not always) correlated with its performance in other areas except tool use/agent stuff.
You can just use the official Claude Code, OpenAI Codex, and Gemini extensions on VS Code. You get diffs just like in Cursor now. The performance of these models can vary wildly depending on the agent harness they're on.
The official tools won't necessarily give you the best performance, but they're a safer bet for now. This is merely anecdotal as I haven't bothered to check rigorously, but I and others online have found that GPT-5-Codex is worse in Cursor than in the official CLI/extension/web UI.