# arize-phoenix: v20.12.0

Category: safety-research
Published: 2026-09-14T20:34:55Z
Source: [Arize Phoenix releases](https://github.com/Arize-ai/phoenix/releases/tag/arize-phoenix-v20.12.0)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-21T12:17:43.344Z
Tags: observability, evaluation, tracing

## Human Summary
Arize Phoenix releases published arize-phoenix: v20.12.0. 20.12.0 (2026-09-14) Features api: expose trace and session filter expressions ( 16077 ) ( d613de7 ) server: add GET /datasets/{dataset identifier}/splits ( e60697f ), closes 12090 Bug Fixes cost: update built-in model token prices ( 25b95d7 ) server: address review findings for GET…

## Agent Summary
Treat arize-phoenix: v20.12.0 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
Arize Phoenix releases published arize-phoenix: v20.12.0. This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: 20.12.0 (2026-09-14) Features api: expose trace and session filter expressions ( 16077 ) ( d613de7 ) server: add GET /datasets/{dataset identifier}/splits ( e60697f ), closes 12090 Bug Fixes cost: update built-in model token prices ( 25b95d7 ) server: address review findings for GET /datasets/{dataset identifier}/splits ( 655802b ) server: scope listed dataset splits by example membership only ( eafa87c )

## Recommended actions
- Review the official Arize Phoenix releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## 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.