I take these early reports (less than a week or two after a major model release) with a grain of salt. It takes time to get to know a model, and maybe there's some selection bias in who's posting within 1-2 days of getting access.
(Although in this particular case, the very different knowledge cutoff makes it a lot easier to believe)
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)
(Although in this particular case, the very different knowledge cutoff makes it a lot easier to believe)