Gavin Baker posted that Grok 4.5 ranked as the best frontier model in quality and speed benchmarks, sharing an image of the results. Elon Musk quoted the post and stated that Grok 4.5 is Pareto number one when speed and cost are considered together. Baker also wrote that routers, open-source models, and specialized post-training tools from FireworksAI have advanced rapidly. He said the combination is accelerating growth at vertically focused AI companies, naming Legora as one example now able to use the tools effectively. The posts appear on X.