Logomarks for advanced AI research organisations tend to have circular, optical appearances; perhaps to relate to a vision to the future, an interface to the brain (in the same way the eye is), an omnipotent power, or a cycle of iteration-based development.
DeepMind is a subsidiary of Google's parent company Alphabet Inc.. Their website uses a variety of different blues (likely to denote intelligence, calmness, openness, trustworthiness etc.) and responsive animated elements (likely to denote progress, electrical connections in the brain and in technology, the synthesis of biology and computing etc.) to create an appropriate but almost avant-garde appearance.
The animations, colour set and typefaces all help to create a technological, scientific and advanced (but functional) aesthetic.
Responsive animations and an optical logomark are also employed by OpenAI, a started-up founded by Elon Musk with the intention of democratising artificial intelligence. Like DeepMind, OpenAI's site makes use of string-like illustrations and a high use of animation, but OpenAI employs a much wider gamut of colours (perhaps to denote the intended openness and democratic responsibility of the organisation).
Though colour is used liberally (above), many areas of the site are clean and white, with a large amount of negative space (or use the mode traditional blue-green approach [seen below]). This could again serve to create an open, honest and trustworthy appearance.
In summary, responsive animations, gradient colour sets, custom typefaces and blue/green palettes are the trends most visible in the AI industry, and indeed many of these trends can be applied more broadly to the most recent, most well funded design arenas on the web. Gradients in particular are fighting against the previous trend of flat bright/pastel colours.