Many would say Google's Gemini models are SOTA, although Claude seems to be doing well with coding tasks.
Gemini has been better than Claude for me on a coding project. Claude kept telling me it update some code but the update wasn't in the output. Like, I had to re-prompt just for updated output 5 times in a row.
I break out Gemini 2.5 pro when Claude gets stuck, it's just so slow and verbose. Claude follows instructions better and seems to better understand it's role in agentic workflows. Gemini does something different with the context, it has a deeper understanding of the control flow and can uncover edge case bugs that Claude misses. o3 seems better at high level thinking and planning, questioning if it should it be done and whether the challenge actually matches the need. They're kind of like colleagues with unique strengths. o3 does well with a lot of things, I just haven't used it as much because of the cost. Will probably use it more now.