TensorZero
@TensorZero
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open-source stack for industrial-grade LLM applications ⤷ gateway · observability · optimization · evaluation · experimentation
NYC
Joined October 2023
Announcing our $7.3M seed round! TensorZero enables a data and learning flywheel for optimizing LLM applications: a feedback loop that turns production metrics and human feedback into smarter, faster, and cheaper models and agents. Today, we provide an open-source stack for
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TensorZero 2025.10.9 is out! 📌 This release introduces a suite of dataset HTTP endpoints and UI editing for messages/content blocks, plus enhanced observability with new OpenTelemetry spans and dynamic OTLP attributes. It also includes a small breaking change to programmatic
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TensorZero 2025.10.7 is out! 📌 This release introduces an API endpoint for batch datapoint updates and improves the handling of input files for multimodal inference. — Changelog 🚨 [Breaking Change] The default value for `fetch_and_encode_input_files_before_inference` is
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TensorZero 2025.10.6 is out! 📌 This release renames evaluations (static ➝ inference, dynamic ➝ workflow), expands support for the OpenAI Responses API, and fixes a few small bugs. — Changelog ⚠️ [Planned Deprecation] We're renaming "static evaluations" to "inference
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TensorZero 2025.10.5 is out! 🔨 Add `FinishReason.STOP_SEQUENCE` to the TensorZero Python SDK.
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TensorZero 2025.10.4 is out! 📌 This release adds OpenAI’s Responses API support, strict JSON generation on Groq, file-URL inputs on Anthropic, encrypted reasoning on OpenAI, and better OTLP/dynamic credential handling. — Changelog ⚠️ [Planned Deprecation] The
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TensorZero 2025.10.3 is out! 🔨 Fix bug in the Playground UI that caused inferences containing static tools with custom names (`tools."my_tool".name`) to fail.
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TensorZero 2025.10.2 is out! 📌 This release adds granular rate limits, OTLP header support, and UI enhancements for templates and schemas, plus supervised fine-tuning for Together AI models. It also improves dynamic in-context learning and ships important deprecations and a bug
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TensorZero 2025.10.1 is out! 🆕 Increase default body limit to 100MB for `patch_openai_client`. & multiple under-the-hood and UI improvements
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TensorZero 2025.10.0 is out! 📌 This release adds powerful UI controls for tagging and editing datapoint system prompts, a new setting to control how input files are fetched and encoded, and clearer database error messages. It also fixes issues with static evaluation rendering,
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TensorZero 2025.9.6 is out! 🔨 Implemented a workaround for an upstream bug in `opentelemetry-otlp` that caused our OTLP exporter to fail to send data to encrypted endpoints. 🆕 Added multiple small improvements to the evaluations UI to streamline common workflows and simplify
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