Al Chen (alchen.eth (🍔,🍔)) from Grammarly recently built an agent with a continuous improvement loop using TensorZero + LangGraph. Watch his presentation at the NYC LangChain Meetup last week!

TensorZero 2025.9.0 is out! 📌 This release includes two supervised fine-tuning recipes (`axolotl` and `torchtune`), caching support for embeddings, and new charts in the UI. It also includes important bug fixes, including a workaround for regressions in ClickHouse 25.8. —

Thank you for 10,000 stars and 100 contributors — on the same day! We're excited to continue building a next-generation open-source stack for LLM applications. Find us on GitHub ↓

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Viraj didn't want his picture taken because 'it hurts the soul'...

TensorZero 2025.9.3 is out! 📌 This release adds dynamic OTLP headers for OpenTelemetry, `allowed_tools` field support for the OpenAI endpoint, and adaptive HTTP2 connection pooling for better performance. Changelog 🆕 Add support for dynamic OTLP headers when exporting

TensorZero OSS turned one!

TensorZero 2025.9.4 is out! 📌 This release extends the flexibility of TensorZero's prompt templates and schemas and fixes a UI regression that prevented `chat` datapoints from being edited. — Changelog ⚠️ [Planned Deprecation] Rename types from `Dicl*` to `DICL*` in the

TensorZero 2025.9.5 is out! 📌 This release introduces multiple UI improvements (model observability, SFT with GCP Vertex AI, performance, etc.) and support for OpenInference. Changelog 🆕 Add model observability page to the UI with model throughput and latency analytics. 🆕

Claude Code + Sonnet 4.5 = huge improvement for large Rust projects 🦀

just over a year later... we're trademarked!

is reinforcement fine tuning worth it? OpenAI's RFT can be 700x more expensive than SFT and has stricter content moderation i tested it on data extraction, agentic coding, and customer service to find out 🧵

Claude Code + Sonnet 4.5 = demolishing small issues and paper cuts two agents running on my side monitor improving TensorZero in the background

excited to welcome Hatsune Miku as TensorZero's brand ambassador

new cargo clean record for me 🦀

Sonnet 4.5 is a more consistent engineer, but GPT-5-Codex is brilliant. Just in the last few days, Codex solved a gnarly CI bug (weird Docker Compose networking behavior) and came up with a really clever solution for a TensorZero UI feature (streaming data from Rust to Node via