Summary: LMArena adds Gemini 3 and GPT-5 to leaderboard

Why It Matters: The platform has updated its rankings with several unreleased or next-generation AI models, signaling a major shift in the competitive landscape for frontier large language models.

What Changed:

• Added new top-tier models to the leaderboard including Gemini 3 Pro, Gemini 3 Flash, and Grok 4.1.
• Included placeholder or preview rankings for GPT-5.1, GPT-5.2, and Claude 4.5 variants.
• Updated the rankings for "thinking" and reasoning models like DeepSeek-R1 and O3-mini.
• Replaced the standard landing page text with a dense data table of model performance scores.