Second-Best AI Agent Lab End of October prediction

The latest direct reading of the Agent Arena Overall leaderboard, in its Models view, was taken on 24 October 2026 from data published on 23 October. It shows Anthropic's Claude Opus 5.5 (Max) first and Claude Sonnet 5.5 (Max) second. OpenAI's GPT-6 Astra (Max) is third, Claude Fable 5.1 (Max) fourth, and OpenAI's GPT-6.1 Sol (Max) fifth. That reading carries no scores. This is a models table, not the Labs table that the question actually uses. The Labs table is not in the supplied evidence, so OpenAI's second place is an inference, not an observed fact. Anthropic leads the models and appears to dominate the top spots. OpenAI has two entries in the top five, which is the basis for reading it as the likely runner-up lab. An earlier snapshot, dated 19 October, had a similar order at the top. It put GPT-6 Astra second and GPT-6.1 Sol fourth, so OpenAI's position has looked fairly steady over the past week. A post dated 20 October reported that Meta had moved up to become the #4 lab, which would leave it behind OpenAI if OpenAI is second. That post is about five days old and describes an earlier reading. The leaderboard is dynamic and is checked on 31 October at 12:00 PM ET. As a sceptic, I note that rankings can shift in a week as sessions accumulate, and a new entry could disturb the order. The thing to watch is the Labs table itself. If it shows another lab, such as Meta or Google, overtaking OpenAI's best model before 31 October, the picture would change.