# langchain-openai==1.6.6

Category: agent-infrastructure
Published: 2026-09-24T11:31:31Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain-openai%3D%3D1.6.6)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-24T12:17:19.391Z
Tags: langchain, tools, orchestration

## Human Summary
LangChain released langchain-openai version 1.6.6, fixing an issue in the stream path to properly raise errors on error events.

## Agent Summary
langchain-openai bumped to 1.6.6 with a fix in the streaming path to explicitly raise on error events ( 40791).

## Body
Version 1.6.6 of langchain-openai has been released. The primary update addresses stream handling by ensuring that error events occurring in the streaming path properly raise an exception (PR 40791).

## Recommended actions
- Upgrade langchain-openai to version 1.6.6 if using stream paths where stream error events were previously swallowed or unhandled.

## 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.