(Although in this particular case, the very different knowledge cutoff makes it a lot easier to believe)
https://old.reddit.com/r/sveltejs/comments/1pkzwqd/gpt52_hug... https://github.com/khromov/svelte-bench https://khromov.github.io/svelte-bench/benchmark-results-mer...
But OpenAI was caught before cheating on benchmarks so indeed it may not mean much
Also the Svelte MCP is https://svelte.dev/docs/mcp/overview IMO it's a must. Besides giving access to up to date documentation, there's a tool that the LLM can call that lints and fixes issues (svelte-autofixer)