langchain-core==1.3.0

LangChain Releases / 4/17/2026

📰 NewsDeveloper Stack & InfrastructureTools & Practical UsageModels & Research

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Key Points

langchain-core 1.3.0 introduces a new 1.3.0 release line along with a 1.3.0a3 pre-release update.
The update includes a compatibility-focused change to preserve checkpoint_ns behavior in streaming metadata.
It adds chat model and LLM invocation parameters to traceable metadata, improving observability for LLM calls.
Security-related fixes restore cloud metadata IPs and link-local ranges in the SSRF policy and harden private SSRF utilities.
Development maintenance includes bumping pytest to 9.0.3.

Changes since langchain-core==1.2.31

release(core): release 1.3.0 (#36851)
release(core): 1.3.0a3 (#36829)
chore(core): keep checkpoint_ns behavior in streaming metadata for backwards compat (#36828)
feat(core): Add chat model and LLM invocation params to traceable metadata (#36771)
fix(core): restore cloud metadata IPs and link-local range in SSRF policy (#36816)
chore(deps): bump pytest to 9.0.3 (#36801)
chore(core): harden private SSRF utilities (#36768)
fix(openai): handle content blocks without type key in responses api conversion (#36725)
chore: bump pytest from 9.0.2 to 9.0.3 in /libs/core (#36719)
release(core): 1.3.0.a2 (#36698)
fix(core): Use reference counting for storing inherited run trees to support garbage collection (#36660)
docs(core): nit (#36685)
release(core): 1.3.0a1 (#36656)
chore(core): reduce streaming metadata / perf (#36588)