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

# Feature lifecycle

> Understand what private preview, public preview, and general availability mean for the availability, stability, and production readiness of features in Braintrust.

<Note>
  A feature is generally available unless its documentation marks it otherwise.
</Note>

## Private preview

Available to selected customers by invitation. The feature works end to end, but expect gaps, breaking changes, and limited SDK coverage. Pricing isn't set, and the feature might not be documented publicly.

## Public preview

Available to everyone, but behavior, APIs, and configuration can still change, and pricing might not be final. You can run a public preview feature in production as long as you're prepared for its behavior to change.

Features in public preview:

* [.NET SDK](/docs/sdks/csharp/quickstart)
* [Braintrust Gateway](/docs/deploy/gateway)
* [Braintrust Lambda extension](/docs/integrations/runtime-environments/aws-lambda)
* [Sandbox evals](/docs/evaluate/remote-evals#run-a-sandbox-eval)
* [Workflows](/docs/deploy/functions#deploy-workflows)

## General availability

Available to everyone, stable, documented, and priced. Braintrust supports it for production workloads under the terms of your [plan](/docs/plans-and-limits).