phoenix

varize-phoenix-v18.0.0 scope: arize-phoenix Breaking

This release includes 1 breaking change for platform teams planning a safe upgrade.

Published 13d Tracing

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Topics

agents ai-monitoring ai-observability aiengineering anthropic datasets

+10 more

evals langchain llamaindex llm-eval llm-evaluation llmops llms openai prompt-engineering smolagents

Affected surfaces

auth

ReleasePort's take

Moderate signal

editorial:auto 12d

The Sessions API now applies interval‑overlap semantics to time‑range filters.

Why it matters: Requires migration of existing session queries; affects deployments using the sessions API immediately upon upgrade to arize-phoenix-v18.0.0.

Summary

AI summary

Sessions now use interval‑overlap semantics for time‑range filters, requiring migration.

Changes in this release

Type	Severity	Summary	CVE
Breaking	High	Changes session time-range filters to use interval-overlap semantics. Changes session time-range filters to use interval-overlap semantics. Source: llm_adapter@2026-07-14 Confidence: low	—

Full changelog

18.0.0 (2026-07-14)

⚠ BREAKING CHANGES

MIGRATION.md

sessions: use interval-overlap semantics for session time-range filters (#14023)

Features

sessions: use interval-overlap semantics for session time-range filters (#14023) (cd17357)

Breaking Changes

Sessions: session time‑range filters changed to use interval‑overlap semantics

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Earlier breaking changes

varize-phoenix-v19.0.0 GraphQL createUserApiKey and createSystemApiKey reject API-key callers.
varize-phoenix-v17.0.0 Adds system settings for admin-managed assistant enablement and trace recording policy
varize-phoenix-v16.0.0 Sandboxing and Code Evaluators introduce breaking changes in Phoenix v16.0.0.
varize-phoenix-v15.7.0 Removes v1 /chat route and associated code