This is a really neat benchmark. It's super interesting that Astra starts strong and holds the lead for up to 19 hours, but Fable 5.1 catches up in the final hours. Not entirely clear why. Different models solve long-horizon problems with different strategies. It's no surprise that we see different trends. And then there is also the question of cost-performance efficiency. Qwen3.8 Max, Gemini 3.8 Flash, and Grok 4.6 are more economical for research, earning a place on the cost–performance…