Sure. Frontier as in they overtake Anthropics or OpenAIs top model at least once in major benchmarks as e.g. lmarena: https://arena.ai/leaderboard/agent. But I can see how you could classify GLM5.2 as frontier now already.
Yes. The Agent ranking on Arena needs more entries though - for example MiMo 2.5 (also open) was built for this and performs pretty well, but it is not assessed yet.
Sure. Frontier as in they overtake Anthropics or OpenAIs top model at least once in major benchmarks as e.g. lmarena: https://arena.ai/leaderboard/agent. But I can see how you could classify GLM5.2 as frontier now already.