# arize-phoenix: v20.22.0

Category: safety-research
Published: 2026-10-15T07:02:33Z
Source: [Arize Phoenix releases](https://github.com/Arize-ai/phoenix/releases/tag/arize-phoenix-v20.22.0)
Agent usefulness: 72/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-16T00:17:53.115Z
Tags: observability, evaluation, tracing

## Human Summary
Arize Phoenix v20.22.0 adds new playground models, fixes an OAuth2 cookie-handling bug, and introduces tracing documentation for Claude Managed Agents.

## Agent Summary
Arize Phoenix release v20.22.0 introduces support for Meta muse-wonder-1.0 and gemini-4-argon in the playground, fixes SameSite=Strict cookie preservation post-IdP sign-in for OAuth2, and adds tracing documentation for Claude Managed Agents and Harbor plugin release notes.

## Body
Arize Phoenix release v20.22.0 adds support for Meta muse-wonder-1.0 and gemini-4-argon models within the playground. On the bug fix side, it addresses an OAuth2 issue to properly preserve SameSite=Strict cookies on server-owned return URLs after IdP authentication. Documentation updates include new tracing guides for Claude Managed Agents and a standalone release note covering the Harbor plugin.

## Recommended actions
- Upgrade arize-phoenix to v20.22.0 if using OAuth2 with SameSite=Strict cookies or testing the newly added playground models.
- Review new documentation for Claude Managed Agents tracing if integrating tracing for Claude-based agent deployments.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.