Arize-ai/phoenix arize-phoenix-v20.4.0 on GitHub

20.4.0 (2026-08-26)

server: GET /v1/model_providers no longer returns custom providers or a next_cursor, and built-in entries expose provider rather than kind + provider_key. Custom providers move to GET /v1/custom_model_providers. The endpoint is unreleased, so no published client is affected.

agents: add in-process Phoenix MCP toolset (#15285) (e2cf8be)
apply the 2026 brand to the Phoenix docs (#15458) (66c528c)
client: record Harbor jobs in Phoenix (#15547) (f7c6cb3)
evals: add retrieval relevance evaluator (#14766) (7efa7b2)
playground: add gemini-3.7-flash (#15520) (2435eba)
pxi: enable phoenix-gql mutations by default with approval in manual mode (#15415) (391d0dd)
pxi: replace client-action tools with browser-action meta-tools (#15316) (ce13c6f)
server: add GET /model_providers REST endpoint (#15561) (59c247a)
server: add PATCH /projects/{project_identifier}/retention (#15410) (8ffd938)
traces: AI Query for the trace filter DSL (#15461) (31afcc7)

agents: forbid extra fields on UI context models (#15621) (f08a46c)
auth: polish password reset and user management (#15521) (7a65831)
chat-completions: preserve prompt cache usage (7a5bc55)
cost: update built-in model token prices (5150c4d)
cost: update built-in model token prices (#15562) (ad9b3a1)
cost: update built-in model token prices (#15590) (4580f34)
deps: update arize-phoenix-client to 3.2.0 (1989459)
deps: update arize-phoenix-evals to 3.5.0 (#15574) (55184f4)
deps: update arize-phoenix-evals to 3.5.1 (#15605) (5e2becf)
evals: do not echo submitted tool JSON in evaluator prompt validation errors (#15575) (d38df33)
handle missing annotation labels with pandas 3 (#15486) (aebe53f)
mcp/sql: parenthesise an operator key in a postgres JSON read (7b77585)
mcp/sql: parenthesise BETWEEN and IN keys in a postgres JSON read (f12126c)
upgrade to anthropic SDK v1 (#15588) (b28cf94)

agents: make the system prompt static and move UI state onto the turn (#15541) (31fafc5)

Add Phoenix release notes — 2026-08-19 (#15502) (506ebdc)
close PXI / agent-assistant documentation gaps for Phoenix 20 (#15499) (729ff11)
group Arize AX pages under a dedicated left-nav item (45ddcbf)
polish Phoenix vs Arize AX comparison page and fix stale references (cfda2fa)
remove legacy evaluator docs (#14933) (5ece969)
restore redirects for the removed legacy evaluator pages (#15579) (840fa1e)
surface agent-first onboarding in Phoenix quickstarts (bd13ea9)