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Unfortunately, it is not possible to automatically migrate data from your Legacy Phoenix Cloud instance to a new instance.

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New features since v11 in Phoenix Cloud

By switching to the current version of Phoenix Cloud, you’ll get a host of new features, including:
  • Phoenix Assistant – an in-app AI agent that helps you debug traces, author evaluators, drive the playground, and manage datasets directly from a chat panel.
  • Built-in evaluators and no-code evaluator authoring – a library of pre-built LLM-as-a-judge and code-based evaluators you can create, configure, and assign to datasets without writing code.
  • Dataset splits and labels – organize and filter datasets with splits and labels, and run experiments scoped to specific splits.
  • Sessions and multi-turn conversations – first-class support for multi-turn sessions, including turn views, session annotations, and notes.
  • Richer experiments – a side-by-side compare slideover, experiment repetitions, splits-aware runs, and the ability to resume experiments.
  • An expanded playground – repetitions, reasoning/thinking controls, experiment recording, and inline evaluation metrics.
  • Broader model and provider support – the latest Claude (Opus 4.x, Fable 5), Gemini 3, and GPT-5.1 models, plus new providers like Cerebras, Fireworks, Groq, Moonshot, Perplexity, and Together AI.
  • Annotations everywhere – add notes and annotations to spans, traces, and sessions across the UI, REST API, and CLI.
  • Cost and token tracking – token counts and cost surfaced across spans, traces, and sessions.
  • The Phoenix CLI (px) – fetch and filter traces, spans, and sessions, and manage annotations from the terminal.
  • More integrations and easier onboarding – new tracing integrations (TanStack AI, Strands Agents, Mastra, Bedrock, and more) with a searchable, snippet-driven onboarding flow.

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How do I know which version of Phoenix Cloud I’m on?

The easiest way to determine which version of Phoenix Cloud you’re using is by checking the URL in your browser:
  1. The new Phoenix Cloud version will have a hostname structure like: app.arize.phoenix.com/s/[your-space-name]
  2. If your Phoenix Cloud URL does not include /s/ followed by your space name, you are on the legacy version.