TensorZero
Hi HN! We're Gabriel & Viraj, and we're excited to open source TensorZero. To be a little cheeky, TensorZero is an open-source platform that helps LLM applications graduate from API wrappers into defensible AI products. 1. Integrate our model gateway 2. Send metrics or feedback 3. Unlock compounding improvements in quality, cost, and latency It enables a data & learning flywheel for LLMs by unifying: • Inference: one API for all LLMs, with <1ms P99 overhead • Observability: inference & feedback → your database • Optimization: better prompts, models, inference strategies • Experimentation:…
TensorZero launched on August 18, 2025 with 307 votes, #98 of 8,530 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
TensorZero is an open-source platform for building LLM applications at scale. It provides a unified API for accessing different language models, along with built-in observability, prompt and model optimization, evaluation tools, and A/B testing capabilities. The platform is designed for developers who want to transform user feedback and performance metrics into improvements across their LLM systems, making applications faster and more cost-effective. Setup can be completed in minutes.
written from the facts on this page · September 2026
From the sources
Build industrial-grade LLM applications: one API for every LLM, observability, optimization (prompts, models, etc.), evaluations, and A/B testing — all open source. Turn metrics and human feedback into smarter, faster, and cheaper LLMs. Get started in minutes.
TensorZero is an open-source LLMOps platform that unifies an LLM gateway, observability, evaluation, optimization, and experimentation. - tensorzero/tensorzero
In the maker’s words, at launch
Hi HN! We're Gabriel & Viraj, and we're excited to open source TensorZero. To be a little cheeky, TensorZero is an open-source platform that helps LLM applications graduate from API wrappers into defensible AI products. 1. Integrate our model gateway 2. Send metrics or feedback 3. Unlock compounding improvements in…
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