Endex AI Raises $14 Million Led by OpenAI to Bring AI Agents Inside Excel

Endex AI has raised $14 million in a funding round led by the OpenAI Startup Fund, as the company prepares to launch its AI agent explicitly built for Microsoft Excel.

Founded by Tarun Amasa and Pratham Soni, Endex is positioning itself as the first company to embed an autonomous AI agent directly inside Excel. 

After a year of working closely with financial institutions, the startup is now opening early access to the public.

Amasa in an X post highlighted that they spent much of the last year at OpenAI’s San Francisco office, refining their product and testing internal model checkpoints. According to him, this experience helped them realise that advancements in reasoning and agentic tasks, once limited to code, were starting to generalise across other domains.

“We felt that tool use across long horizons was severely limiting the capacity of LLMs from impacting all forms of analytical work,” Amasa wrote on X.

Their company, Endex AI claims to address this with improvements to generalised verifiers and enhanced tool use embedded within chain-of-thought reasoning. These capabilities enable their agent to perform tasks that span multiple hours, a challenge current LLMs typically struggle with while maintaining coherent outputs.

The OpenAI Startup Fund, which has previously backed companies like Ambience Healthcare, and Anysphere, continues its focus on domain-specific agents with this investment.

Endex AI’s Excel-native agent is now available on an invite-only basis, with the company planning a phased rollout. Interested users have been invited to register their interest through the waitlist.