# stagehand-python@4.2.1: Release Stagehand packages ( 3160)

Category: open-source
Published: 2026-10-10T17:31:14Z
Source: [Browserbase Stagehand releases](https://github.com/browserbase/stagehand/releases/tag/stagehand-python%404.2.1)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-10T18:17:38.025Z
Tags: browserbase, browser-agent, automation

## Human Summary
Browserbase Stagehand released patch updates across its ecosystem, enabling support for arbitrary new model IDs on supported providers without requiring package updates.

## Agent Summary
Stagehand packages (including stagehand-python@4.2.1 and stagehand@4.2.1) now dynamically accept new model IDs for supported providers, delegating availability checks directly to the providers while strictly rejecting empty or whitespace-containing IDs.

## Body
The automated Changesets release for Stagehand packages—including @browserbasehq/stagehand-python@4.2.1, @browserbasehq/stagehand@4.2.1, @browserbasehq/stagehand-go@4.2.1, and associated SDKs—introduces patch changes allowing supported providers to accept new model IDs without necessitating a library release. Stagehand will reject empty or whitespace-containing model IDs and will rely on individual providers to validate and report model availability.

## Recommended actions
- Ensure model IDs passed to Stagehand configurations do not contain empty strings or whitespace characters.
- Update to stagehand-python@4.2.1 or corresponding ecosystem packages if needing to use newly released provider models without local workarounds.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.