Celestial AI, a Silicon Valley startup developing technology to speed up artificial intelligence (AI) systems, has recently raised an additional $250 million in venture capital, bringing the company’s total funding to $515 million.

As we navigate through 2025, the startup ecosystem is experiencing a transformative era, with emerging technologies reshaping industries and daily life. Here are some of the most promising AI startups, from around the world, to watch out for in 2025.

Sierra, a Silicon Valley-based AI startup co-founded by Bret Taylor, former Salesforce co-CEO and current OpenAI Chairman of the Board, has secured $175 million in a new funding round, giving the startup a $4.5 billion valuation. 

An artificial intelligence researcher, Fei-Fei Li also nicknamed as the “Godmother of AI” has raised USD 230 million for AI startup “World Labs” along with her three colleagues to develop AI technology that can comprehend how the three-dimensional physical world works, the company announced on Friday.

Story Engine Inc., an AI startup co-founded by Bangladeshi Stanford graduate Sheikh Srijon, has received $750,000 in pre-seed funding from the reputed venture capital firm Andreessen Horowitz (A16Z). The startup, founded by Sheikh Srijon, Zhizhuo Zhou, and Wanrong He, aims to revolutionise the realm of webtoon and anime creation through generative AI technology.

Hishab Technologies Limited, a startup focusing on telephony-driven conversational engines powered by generative AI has received an investment of BDT 2 crore from Startup Bangladesh Limited.

In just four days, using only ChatGPT and a modest US$185 (about BDT 20k) investment, Sal Aiello and Monica Powers transformed a side hustle into a highly profitable AI startup. Fast forward to last month, the duo successfully sold their venture for a whopping $150,000 (about BDT 16 million).