Artificial intelligence · 2025

Gemini 2.5 Pro

Google's thinking model tops the leaderboards with a million-token context.

Released in March 2025, Gemini 2.5 Pro combined built-in reasoning with long context and took first place on the LMArena leaderboard. Its Deep Think mode later scored gold-medal level at the IMO.

See it in the living tree Wikipedia

Arcs above join it to what it stood on, arcs below to what it led to. The bar places this stretch on the tree's whole timeline.

What it built on 2

Gemini 1.5 long context 2024
Reasoning models (o1) 2024

What it led to 3

Gemini 3 2025
Gemini Robotics 2025
LLMs win IMO gold 2025

Related measurements

The dashed line marks when it first worked.

Best AI score on GPQA Diamond Latest: 95.8 % correct (2026) Source: Epoch AI, Capabilities & benchmarking (benchmark_data.zip, gpqa_diamond.csv); Anthropic: Claude 3 public launch (March 4, 2024)

Training compute of notable AI models Source: Epoch AI, Notable AI Models (CC BY 4.0)