Model behind Deep Research agent?

 title: 'Gemini 2.5 Pro Pokémon Progress Timeline graph.'

The Gemini Deep Research agent is built on top of the Gemini 2.5 Pro model[1]. Since its initial launch in December 2024, the capabilities of Gemini Deep Research have been improved[1].

As evidence of that, the performance of Gemini Deep Research on the Humanity’s Last Exam benchmark has gone from 7.95% in December 2024 to the SoTA score of 26.9% and 32.4% with higher compute in June 2025[1].