# langchain-core==1.6.3

Category: agent-infrastructure
Published: 2026-09-11T17:38:02Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.6.3)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-20T18:17:25.882Z
Tags: langchain, tools, orchestration

## Human Summary
LangChain released langchain-core 1.6.3, allowing tracing metadata overrides for model name and provider based on gateway responses, alongside doc and test updates.

## Agent Summary
langchain-core==1.6.3 introduces the ability to override model name and provider tracing metadata from gateway responses, adds test coverage for deprecated .text() access, and cleans up stale docstrings in FileCallbackHandler.write and ChatGeneration.set text.

## Body
LangChain core has been updated to version 1.6.3. Key changes include a feature to allow model name and provider tracing metadata to be overridden based on gateway responses (PR 40406), added test coverage for the deprecated .text() access path (PR 40243), and cleanup of stale Args/Raises doc entries in FileCallbackHandler.write and ChatGeneration.set text (PR 40211).

## Recommended actions
- Upgrade to langchain-core==1.6.3 if model name and provider tracing metadata overrides via gateway responses are needed.
- Verify usage of the deprecated .text() access path in existing implementations.

## 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.