> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fiddler.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

> Release notes for the Fiddler AI Observability Platform and supported SDKs.

Track new features, fixes, and deprecations across the Fiddler platform and
its SDKs. Each section below has its own page and its own RSS feed.

<Tip>
  **Latest platform release: Release 26.12 — June 16, 2026.** Secret Detection
  in prompts and responses, the Kong AI Gateway integration, an Executive
  Dashboard, and bulk trace and session deletion. See
  [Product releases](/changelog/product-releases#june-16-2026) for full notes.
</Tip>

## Platform

<CardGroup cols={2}>
  <Card title="Product releases" icon="sparkles" href="/changelog/product-releases">
    Platform features, enhancements, and fixes for Fiddler AI Observability.
  </Card>

  <Card title="Python client compatibility matrix" icon="table-cells" href="/changelog/compatibility-matrix">
    Recommended `fiddler-client` version for each Fiddler platform release.
  </Card>
</CardGroup>

## SDKs

<CardGroup cols={2}>
  <Card title="Python Client SDK" icon="python" href="/changelog/python-sdk">
    Releases of `fiddler-client` — model onboarding, publishing,
    baselines, alerts, and custom metrics.
  </Card>

  <Card title="Fiddler Evals SDK" icon="vial" href="/changelog/evals-sdk">
    Releases of `fiddler-evals` — built-in and custom LLM-as-a-judge
    evaluators for experiments and regression tests.
  </Card>

  <Card title="Fiddler LangGraph SDK" icon="diagram-project" href="/changelog/langgraph-sdk">
    Releases of `fiddler-langgraph` — auto-instrumentation and tracing
    for LangGraph agents.
  </Card>

  <Card title="Fiddler Strands Agent SDK" icon="robot" href="/changelog/strands-sdk">
    Releases of `fiddler-strands` — instrumentation and tracing for
    Strands Agents.
  </Card>

  <Card title="Fiddler LangChain SDK" icon="link" href="/changelog/langchain-sdk">
    Releases of `fiddler-langchain` — middleware-based instrumentation
    for LangChain V1 agents.
  </Card>

  <Card title="Fiddler OTel SDK" icon="bezier-curve" href="/changelog/otel-sdk">
    Releases of `fiddler-otel` — the shared OpenTelemetry foundation
    used by the agentic SDKs.
  </Card>
</CardGroup>

## Subscribe

Every changelog page exposes an RSS feed at the same URL with `/rss.xml`
appended — for example,
`https://docs.fiddler.ai/changelog/product-releases/rss.xml`. Look for the
RSS icon at the top of any release-notes page, or add the feed directly to
Slack, email, or your reader of choice.