langchain-core==1.2.26

LangChain Releases / 4/4/2026

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Key Points

langchain-core version 1.2.26 was released with updates since 1.2.25 across core functionality, fixes, and documentation tweaks.
The release adds an initialization validator and Bedrock model serialization mappings to improve correctness when using AWS Bedrock integrations.
A new `ChatBaseten` entry was added to LangChain’s serializable mapping to support proper serialization/deserialization for that chat model.
Maintenance changes include dropping `gpt-3.5-turbo` from docstrings and correcting parameter names in the `filter_messages` docstring example.

Changes since langchain-core==1.2.25

release(core): 1.2.26 (#36511)
fix(core): add init validator and serialization mappings for Bedrock models (#34510)
feat(core): add ChatBaseten to serializable mapping (#36510)
chore(core): drop gpt-3.5-turbo from docstrings (#36497)
fix(core): correct parameter names in filter_messages docstring example (#36462)