# langchain-openai==1.6.5

Category: agent-infrastructure
Published: 2026-09-23T15:31:54Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain-openai%3D%3D1.6.5)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-24T00:17:19.266Z
Tags: langchain, tools, orchestration

## Human Summary
langchain-openai 1.6.5 adds support for mid-conversation tool modifications via SystemMessage and introduces profile augmentations for Opus 5.5 and GPT-6.

## Agent Summary
Upgrade to langchain-openai==1.6.5 to access mid-conversation tool adjustments on SystemMessage and profile augmentations referencing Opus 5.5 and GPT-6.

## Body
The langchain-openai release version 1.6.5 introduces changes since 1.6.4, including a fix providing profile augmentations for Opus 5.5 and GPT-6, and a new feature across Anthropic and OpenAI integrations that supports mid-conversation tool changes specified on SystemMessage.

## Recommended actions
- Upgrade to langchain-openai==1.6.5 if mid-conversation tool changes or updated model profile augmentations are required.

## 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.