Respan unifies LLM observability, evals, prompt optimization, and an AI gateway so teams can ship reliable AI applications.
TensorZero
TensorZero builds open-source tools for production-grade LLM applications: LLM gateway, observability, optimization, evaluations, and experimentation.
About TensorZero
TensorZero is a platform that developed open-source tooling for building and managing production-grade large language model (LLM) applications. Its suite of tools was designed to support the full lifecycle of LLM app development, from deployment to ongoing optimization, though the project is no longer actively maintained. Users could leverage its LLM gateway to route model requests, monitor performance with built-in observability features, improve output quality via optimization tools, assess response accuracy with evaluation capabilities, and test variations using experimentation functionality. The platform was intended for developers and engineering teams that needed robust infrastructure to run LLM applications reliably in production environments.
Key features
- Open-source LLM gateway for routing production model requests
- Built-in observability tools for tracking LLM application performance
- Optimization features to improve LLM output quality and consistency
- Evaluation tools to measure LLM response accuracy and relevance
- Experimentation functionality for testing LLM application variations
Best for: It is best suited for developers and engineering teams building and maintaining production-grade large language model applications.
Good for
- Core tooling is open-source, enabling customization and self-hosting
- Comprehensive suite covers the full LLM application lifecycle
- Purpose-built for production-grade LLM deployment use cases
Watch out for
- Project is no longer actively maintained, with no new updates or official support
- No publicly available pricing information for any associated services
TensorZero at a glance
- Website
- tensorzero.com
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Open source
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TensorZero FAQ
Is TensorZero still actively maintained?
No, the project is no longer maintained, so there are no new updates, bug fixes, or official support available.
What tools does TensorZero offer for LLM applications?
It provides an LLM gateway, observability, optimization, evaluation, and experimentation tools for production LLM apps.
Is TensorZero's tooling free to use?
The core tools are open-source and available on GitHub at no cost, though no pricing for additional services is publicly listed.
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