TensorZero Secures $7.3M to Develop Open-Source LLM Stack

August 19, 2025
TensorZero has raised $7.3 million in seed funding to build an open-source stack for industrial-grade LLM applications, announced in a press release. The funding round was led by FirstMark, with participation from Bessemer Venture Partners and Bedrock.

TensorZero has raised $7.3 million in seed funding to develop an open-source stack for industrial-grade LLM applications, announced in a press release. The funding round was led by FirstMark, with participation from Bessemer Venture Partners and Bedrock.

The open-source stack by TensorZero aims to unify various components such as an LLM gateway, observability, optimization, evaluation, and experimentation. This initiative addresses the current gap in tools available for building complex LLM applications, providing enterprise-ready components that work seamlessly together.

Recently, TensorZero's repository became the '#1 trending repository of the week' on GitHub, highlighting its growing adoption among both the open-source community and enterprises. The company has already seen its stack being used by frontier AI startups and large organizations, including a major European bank.

The funding will accelerate TensorZero's efforts to enhance its open-source infrastructure, aiming to create a feedback loop that optimizes LLM applications through real-world data and human feedback.

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