langchain-core==

AI release Oct 21, 2026

langchain-core== 1.6.13

LangChain Core now streams tool-call-delta events, enabling real-time partial tool invocation data in stream consumers

AI release Oct 16, 2026

langchain-core== 1.6.12

Content-block-start events now propagate extras, fixing event metadata handling in streaming chains

AI release Oct 15, 2026

langchain-core== 1.6.11

LangChainTracer now accepts custom addresses for tracing, enabling flexible instrumentation of LLM applications across different deployment environments

AI release Oct 6, 2026

langchain-core== 1.6.7

Bedrock converse now includes OpenAI redacted_content in v1 output; Python 3.14 compatibility hardened

AI release Sep 4, 2026

langchain-core== 1.6.2

Adds async tools support and avoids mutation in certain code paths

AI release Aug 19, 2026

langchain-core== 1.6.0

Resolves tool schema serialization issues, adds standard exception types, and improves Windows compatibility in langchain-core

AI release Aug 11, 2026

langchain-core== 1.5.4

Langchain-core 1.5.4 fixes Pydantic 2.14 compatibility, stops StructuredPrompt from mutating caller kwargs, and preserves tool argument schemas

AI release Jul 21, 2026

langchain-core== 1.5.0

Adds reasoning effort as a standard chat-model parameter

AI release Jun 18, 2026

langchain-core== 1.4.8

Langchain-core 1.4.8 memoizes tool schemas, caches JSON schemas, preserves token usage in streaming, and drops Python 3.9 support

AI release Jun 8, 2026

langchain-core== 1.4.2

LangChain Core deprecated the problematic dict() method to encourage use of safer serialization patterns in LLM application chains

AI release Jun 5, 2026

langchain-core== 1.4.1

Removes Bedrock prevalidation from load path; Bumps uuid-utils to 0.16.0