Two Acquisitions Deep, Two Still Standing: What's Really Happening to Open-Source LLM Observability
Langfuse and Helicone were acquired in 2026 while Opik and Phoenix stayed independent — here's what each acquirer actually promised in writing.
In the past year, two open-source LLM observability tools have been acquired while the other two remain independently run. Langfuse was acquired by ClickHouse on January 16, 2026, with ClickHouse promising that the tool would remain 100% open-source and self-hostable, with no changes to existing deployments. In contrast, Mintlify acquired Helicone on March 3, 2026, and announced that the tool would move into maintenance mode, without any open-source or self-hosting commitments.
Comet ML and Arize AI, the parent companies of Opik and Phoenix respectively, have not been acquired themselves and continue to operate independently. Neither Opik nor Phoenix have had ownership changes. All four tools have active development, with commits and issues still being opened on a daily basis.
Written by urgent.news from HackerNoon's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
