If you're gonna rank them: Anthropic > OpenAI > Google > Meta > (everyone else).

Gotta think Grok's cognitive dissonance due to the need to rewrite reality for Musk's political and moral biases is always going to keep them behind the frontier, but this is just speculation. The amount of money and power they have should put them at the top and I can't otherwise explain why they're consistently behind. Maybe Musk is simply too cheap/control freaky to throw enough money/benefits at good employees.