TensorZero

TensorZero is an open-source framework for building production-grade LLM applications. It unifies an LLM gateway, observability, optimization, evaluations, and experimentation.

Foundation models and researchData and analyticsDeveloper tools and cloud

TensorZero raised $7.3M in a Seed round announced August 19, 2025, according to finsmes.com. Investors in that round: FirstMark.

Raise history

1. September 29, 2026
   First seen by Recent Funding
   via startups.gallery
2. August 19, 2025
   Seed · $7.3M
   FFirstMark (lead)
   Source: finsmes.com (startups.gallery listing)

Investors

• FFirstMark

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Every amount links to the page it came from. How Recent Funding sources and verifies funding data. The same data as JSON: /api/v1/companies/tensorzero.