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§ Private Profile · New York City, NY, USA
TensorZero is a technology company.
TensorZero provides an open-source LLMOps platform that automates LLM engineering, optimizing prompts and models, and running evaluations and A/B tests.
TensorZero has raised $7.0M across 1 funding round.
TensorZero has raised $7.0M in total across 1 funding round.
TensorZero has raised $7.0M in total across 1 funding round.
TensorZero's investors include FirstMark Capital, Altimeter Capital, Battery Ventures, Benchmark, Bessemer Venture Partners, Bond, Citi Ventures, Coatue, Hanabi Capital, IVP, Khosla Ventures, Lightspeed Venture Partners.
TensorZero is an open-source platform that unifies inference, observability, optimization, evaluation, and experimentation for large language models (LLMs), enabling AI engineers to build production-grade, defensible AI products.[1][2][3] It serves machine learning teams and developers deploying LLM applications by providing a data and learning flywheel—via a Rust-based model gateway with <1ms P99 latency, ClickHouse-backed observability, prompt engineering tools, fine-tuning, A/B testing, and GitOps orchestration—solving the problem of fragmented tools that hinder scalable, cost-effective LLM optimization.[1][2] Fully self-hosted and free, with enterprise support, TensorZero has gained rapid traction, raising $7.3M in seed funding in August 2025 from FirstMark, Bessemer Venture Partners, Bedrock, and others, while trending #1 on GitHub.[2][3]
TensorZero emerged from the need for LLMs to learn from real-world production data, founded by a team including co-founder and CTO Viraj Mehta, a former Rust compiler maintainer, machine learning researchers from Stanford, CMU, Oxford, and Columbia (with thousands of citations), and the former chief product officer of a decacorn startup.[2][3] The idea crystallized as companies struggled to integrate disparate LLM tools, leading to the creation of an open-source stack that captures inference data and feedback for continuous improvement, akin to on-the-job learning for AI models.[2][3] Early momentum included production use cases like automating code changelogs at a large bank, a $7.3M seed round announcement in August 2025 that propelled it to #1 trending on GitHub, and backing from investors in projects like ClickHouse, CockroachDB, OpenAI, and Anthropic.[2][3]
TensorZero rides the wave of maturing LLM adoption, where enterprises demand industrial-grade infrastructure amid exploding model complexity and costs, addressing the "stitching together" of inadequate tools highlighted by investors like FirstMark's Matt Turck.[3] Its timing aligns with 2025's shift toward agentic AI and real-world feedback loops, as models handle complex workflows requiring production data for improvement—market forces like open-source momentum (e.g., ClickHouse parallels) and investor enthusiasm for self-reinforcing LLM stacks favor its flywheel approach.[2][3] By open-sourcing enterprise-ready components, it democratizes high-quality LLM engineering, influencing the ecosystem like foundational tools in databases or infra, potentially accelerating defensible AI products while challenging proprietary platforms.[1][2][3]
TensorZero is poised to expand its stack toward fully autonomous LLM learning from experience, hiring in NYC to scale engineering amid $7.3M funding and proven production wins.[2][3] Trends like multi-modal agents, edge inference, and regulatory pushes for transparent AI will amplify demand for its observability and optimization flywheel, evolving its influence from tooling provider to ecosystem standard-setter.[1][2] As LLM apps proliferate, TensorZero's open, performant foundation positions it to power the next wave of defensible AI, turning fragmented experiments into industrial realities.
TensorZero has raised $7.0M across 1 funding round. Most recently, it raised $7.0M Seed in August 2025.
| Date | Round | Lead Investors | Other Investors | Status |
|---|---|---|---|---|
| Aug 1, 2025 | $7M Seed | FirstMark Capital | Altimeter Capital, Battery Ventures, Benchmark, Bessemer Venture Partners, Bond, Citi Ventures, Coatue, Hanabi Capital, IVP, Khosla Ventures, Lightspeed Venture Partners, Bedrock Capital, Coalition, DRW Venture Capital | Announced |