LLM observability & evals tools used by Artificial Intelligence companies
Each line links its public proof and the date usedby last checked it.
15
Artificial Intelligence companies use LLM observability & evals tools
The most used: Braintrust (5), Comet Opik (4), and Arize AI (2).Data as of Oct 25, 2026
Ranking
Tools ranked by the Artificial Intelligence companies that use them. Ties go to the stronger proof.
Who uses each tool
Strongest proof first. A job post is a signal, the weakest proof.
2
Comet Opik4 companies · Checked Oct 21, 202643 confirmed 1 observedAssemblyAIChecked Oct 21, 2026
Pento.aiChecked Oct 21, 2026
ZencoderChecked Oct 21, 2026
Stability AIChecked Oct 21, 2026
3
Arize AI2 companies · Checked Oct 25, 202624
Galileo2 companies · Checked Oct 6, 202625
LangSmith2 companies · Checked Oct 23, 20262
How usedby counts
A company counts once per tool, at its strongest proof: confirmed (a case study, a named testimonial, a press release or the company's own account), declared (the company told usedby), observed (a vendor logo wall or customers page) or signal (a job post). Counts cover the companies on usedby, never the whole market.
No software vendor had to be left out.
Data as of October 25, 2026.
Questions
Which LLM observability & evals tools do Artificial Intelligence companies use most?
Braintrust leads: 5 of the 15 Artificial Intelligence companies on usedby that use LLM observability & evals tools use it. Next: Comet Opik (4), Arize AI (2), Galileo (2), and LangSmith (2). See Braintrust.
How many Artificial Intelligence companies use LLM observability & evals tools?
15 Artificial Intelligence companies on usedby use at least one of 5 LLM observability & evals tools. It counts the companies usedby tracks.
What proof backs these lines?
Of the 15 companies, each counted at its strongest proof: 4 confirmed, 0 declared, 11 observed and 0 known from a job post.
How does usedby build this ranking?
usedby counts each Artificial Intelligence company once per tool, from public proof: case studies, press releases, the company's own site or its declaration to usedby, vendor customer pages and job posts. Every line shows its proof and the date usedby last checked it.