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Google releases Gemini 2.5 Pro, a thinking model that debuts first on LMArena

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Source: Google

Google DeepMind released Gemini 2.5 Pro Experimental, the first Gemini 2.5 model, which reasons before responding. Google said it debuted at number one on the LMArena leaderboard and that thinking would be built into all its future models.

Why it matters

Google said it would build thinking into all its models from then on, and the first such release debuted at the top of the public LMArena ranking.

When
25 Mar 2025
ID
WTA-N-2025-0176
Who
Google DeepMind

Summary by wheresthe.ai, from Google. Checked against the source on 9 Oct 2026.

Read the original at Google

Source copy: download the page as saved on 18 Oct 2026 (PDF). Also held by the Internet Archive.

Cite this story

WTA-N-2025-0176: “Google releases Gemini 2.5 Pro, a thinking model that debuts first on LMArena.” wheresthe.ai, 25 Mar 2025. https://wheresthe.ai/d/google-gemini-2-5-pro-2025-03/ (source: Google).

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