LLMilestonesA milestone timeline of AI and large language models

Act V · Reasoning and agents

Closed modelGoogle

Gemini 2.5 Pro

Gemini with built-in thinking; it topped LMArena and other leaderboards at launch.

Why it matters

Marked Google regaining the lead at the frontier.

Led to

Gemini 3

Source: blog.google ↗

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