Arize AI / Phoenix
Independent · scaled · Founded 2020; Phoenix repo since Nov 2022
Cross-framework observability/evaluation for ML, LLMs and agents; Phoenix OSS; AX includes guardrails, prompt learning and managed agent workflows.
Capabilities exist, but public independently measured savings and invoice-grade workflow economics do not.
Сильный counterexample против тезиса 'никто не замыкает eval на intervention'.