Yes, Gemini 3.1 Pro (High) is still inferior to Opus 4.6 (Thinking) that Google are offering, for planning. It just doesn't think things through as thoroughly as Opus. I'll use it when I've burned up all my Opus tokens and I still have planning I want to do, but I'll read the plan very carefully, whereas with Opus I'll only give it a cursory scan through.
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Yes, Gemini 3.1 Pro (High) is still inferior to Opus 4.6 (Thinking) that Google are offering, for planning. It just doesn't think things through as thoroughly as Opus. I'll use it when I've burned up all my Opus tokens and I still have planning I want to do, but I'll read the plan very carefully, whereas with Opus I'll only give it a cursory scan through.