Breaking Change: Session Time-Range Filters Now Use Interval Overlap
July 14, 2026 Breaking change in arize-phoenix 18.0.0 Session time-range filters now match on interval overlap. A session spans[start_time, end_time] and belongs to a selected time window whenever the two
intervals overlap. Previously sessions were filtered by start_time alone, so a
long-running session that began before the window — but had activity inside it —
was excluded. Those sessions now appear.
- Wider, more accurate results — session lists, counts, and metrics for a time range now include every session active during the window, not only those that started inside it
- Database migration — upgrading to 18.0.0 runs a schema migration that adds
a composite index supporting the new filter. On large PostgreSQL deployments,
set
PHOENIX_MIGRATE_INDEX_CONCURRENTLY=trueto build indexes without locking writes. See MIGRATION.md for operator guidance.
Batch Annotation Config Management
July 14, 2026 Available in arize-phoenix 17.30.0+ The annotation settings page now supports selecting multiple annotation configurations at once. Select a range of configs and delete them in a single action, with a confirmation dialog that reports how many will be removed.Customizable Data Tables
July 12, 2026 Available in arize-phoenix 17.27.0+ Tables across Phoenix now adapt to how you work. A redesigned column selector lets you pick which columns appear and drag to reorder them, and your layout persists per project.- Drag-and-drop reordering — reorder columns on the traces, sessions, and experiments tables from the redesigned column selector
- Customizable prompts table — choose which columns the prompts table shows
- Authorship columns — datasets and prompts surface who last updated them
- Span I/O previews — hover a truncated input or output cell to preview the full value in a tooltip
Dataset Metrics Tab
July 11, 2026 Available in arize-phoenix 17.25.0+ The dataset page gains a Metrics tab that charts experiment results over time, so you can track how successive experiments on a dataset trend without opening each one individually.Credential Discovery from a .env.phoenix File
July 11, 2026
Available in arize-phoenix-client 2.13.0+ (Python) and @arizeai/phoenix-config 0.3.0+ (TypeScript)
Phoenix SDKs can now discover configuration from a .env.phoenix file. When a
setting is not provided by argument or environment variable, the client walks up
from the current working directory to the nearest .env.phoenix file and reads
PHOENIX_-prefixed keys from it (dotenv format).
PHOENIX_DISCOVER_CONFIG=false to
disable discovery entirely.
@arizeai/phoenix-config.
Unified PHOENIX_PROJECT Environment Variable
July 11, 2026
Available in arize-phoenix-client 2.13.0+ (Python) and @arizeai/phoenix-config 0.2.0+ (TypeScript)
Project name resolution is now consistent across every SDK surface. Both
PHOENIX_PROJECT (canonical) and PHOENIX_PROJECT_NAME (supported alias) route
to the same project, with explicit arguments still taking precedence over both.
If the two variables are set to conflicting values, PHOENIX_PROJECT wins and a
one-time warning naming both values is emitted.
Filter Projects by Name in the Python Client
July 11, 2026 Available in arize-phoenix-client 2.13.0+ (Python)projects.list() accepts a name_contains argument for a case-insensitive
substring match, so you can locate projects without paging through the full list.
GPT 5.6 Family in the Playground
July 9, 2026 Available in arize-phoenix 17.23.0+ The OpenAI GPT 5.6 family (gpt-5.6-sol, gpt-5.6-terra, and gpt-5.6-luna) is
now selectable in the Playground and prompts for the OpenAI provider.
Global Search Command Palette (⌘K)
July 8, 2026 Available in arize-phoenix 17.21.0+ Jump to anything in Phoenix without navigating the sidebar. Press⌘K (or click
the search affordance in the side navigation) to open a command palette that
searches projects, datasets, experiments, and prompts by name or description,
alongside top-level pages and the resources you viewed most recently.
- Search everything — projects, datasets, experiments, and prompts in one place
- Recently viewed — recent resources surface instantly for quick return trips
- Keyboard-first — open with
⌘Kand navigate results without the mouse
Session Workflow Enhancements
July 8–13, 2026 Available in arize-phoenix 17.21.0+ through 17.28.0+ Working with sessions gets a set of upgrades across the sessions table and detail view:- Session stats panel — a collapsible aside on the sessions table shows the session count, average traces per session, session duration (average, P50, and P99), and per-label annotation summaries (arize-phoenix 17.21.0+)
- Total session count — project cards display the total number of sessions (arize-phoenix 17.21.0+)
- Turn dividers — session detail view separates turns with dividers and a copy control (arize-phoenix 17.21.0+)
- Session annotation editing — add and edit session-level annotations directly in the session detail view (arize-phoenix 17.28.0+)
- Automatic cleanup — orphaned sessions (those left without any traces) are swept after a one-hour grace period, keeping session lists clean (arize-phoenix 17.21.0+)
Playground Refinements
July 11–14, 2026 Available in arize-phoenix 17.26.0+ through 17.30.0+- Output error count — the Playground surfaces how many outputs errored in a run (arize-phoenix 17.30.0+)
- Collapsible sections — collapse Playground panels to focus on the parts you’re editing (arize-phoenix 17.28.0+)
- Clearer forced tool choice — the tool-choice menu spells out what forcing a specific tool does (arize-phoenix 17.26.0+)
Sessions
Group related traces into sessions and inspect them together.
Python Client
Manage projects, datasets, experiments, and annotations from Python.