Amazon’s head of AI confirmed on Monday that founder and executive chair Jeff Bezos is “very involved” in the tech giant’s artificial intelligence efforts even though he’s no longer CEO, while also brushing off concerns that AI foundation models have “hit a wall” in terms of how much improvement new releases are demonstrating over past versions.

“Every time we come close to a wall, there’s a new dimension,” Amazon SVP Rohit Prasad said Monday at Fortune’s Brainstorm AI event in San Francisco.

Prasad, who oversees the tech giant’s Artificial General Intelligence division, was responding to a question about the current debate in AI circles over whether new versions of large language models are not improving as much as they once did. Prasad argued that AI developers have repeatedly found ways to overcome technical barriers.

“I think we’ll keep finding that…sometimes every decade, sometimes every fives years, every three years, you continue to shift the curve up on performance,” he said.

Amazon released a collection of new LLM models last week dubbed Nova, giving the comapny a major in-house AI model to compete with the likes of OpenAI, Alphabet, Meta, as well as Anthropic, a startup Amazon has invested $8 billion.

Prasad’s team is also heavily involved in the development of a new version of Alexa that will allow users to converse with the voice assistant in a more conversational tone, and request that Alexa take actions on their behalf. The new Alexa was first announced in September of 2023 but still hasn’t been released due to multiple delays stemming from issues ranging from organizational structural challenges to concerns over “latency” issues, or how long it takes the assistant to respond to some requests, as Fortune exclusively reported.

Prasad didn’t provide much of an update on Alexa, other than “stay tuned,” and to reaffirm that the goal continues to be to create the world’s best personal assistant. Prasad did note, as Fortune previously reported, that one goal is for users to be able to take actions such as ordering an Uber, or making a restaurant reservation, simply by asking Alexa to do so.

Asked Amazon founder Jeff Bezos’ involvement in the company, Prasad noted that “he’s very involved as he said.” Last week, Bezos had said in a public interview that 95% of the time he still spends at Amazon pertains to AI.

“He’s still very much connected with AI where I spend a lot of time and so I get to see him,” Prasad said, adding that he felt “very fortune for that partnership and mentorship.”