Gemini 2.5
AI Model
Reasoning
Prior generation
Google's 2025 workhorse: thinking built in, Flash economics.
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Gemini 2.5 Pro (March 2025) put Google at or near the top of most leaderboards with built-in thinking, while 2.5 Flash became the cheap default for high-volume workloads. Trained and served entirely on TPUs; the generation that proved Google had caught back up.
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Record reviewed as of 2026-01-15 — see Methodology.