langchain==1.2.16

LangChain Releases / 4/30/2026

📰 NewsDeveloper Stack & InfrastructureTools & Practical UsageModels & Research

共有:

Key Points

langchain version 1.2.16 was released, with changes relative to 1.2.15 captured in the update notes.
The update includes documentation maintenance such as correcting import paths for agent middleware docstrings and updating social/X handle references.
A performance-related change stops inlining agent state into tool-dispatch Send calls.
Dependency/compatibility was addressed via a hotfix that bumps the minimum core versions.
The release train also includes provider-related updates, including langchain 1.4.2 for Anthropic and langchain 1.2.1 for OpenAI.

Changes since langchain==1.2.15

release(langchain): 1.2.16 (#37085)
chore(docs): update x handle references (#37081)
release(anthropic): 1.4.2 (#37061)
perf(langchain): stop inlining agent state into tool-dispatch Sends (#36960)
docs(langchain): correct import paths in agent middleware docstrings (#36987)
hotfix: bump min core versions (#36996)
release(openai): 1.2.1 (#36995)
feat(core): add content-block-centric streaming (v2) (#36834)
fix(fireworks): honor max_retries (#36973)
release(openai): 1.2.0 (#36961)
docs(langchain): correct import path in ModelCallLimitMiddleware docstring (#36895)
feat(langchain): ls_agent_type tag on create_agent calls (#36774)
release(core): release 1.3.0 (#36851)
chore: bump langsmith from 0.6.3 to 0.7.31 in /libs/langchain_v1 (#36800)
chore(deps): bump pytest to 9.0.3 (#36801)
chore: bump pytest from 9.0.2 to 9.0.3 in /libs/langchain_v1 (#36717)
chore: bump pillow from 12.1.1 to 12.2.0 in /libs/langchain_v1 (#36710)
test(langchain): test cache hit/miss on lru (#36659)
perf(langchain): add lru cache when resolving types (#36649)
perf(langchain): add another init test with middleware (#36644)
chore(core): reduce streaming metadata / perf (#36588)
perf(langchain): add benchmark command (#36641)
chore: bump cryptography from 46.0.6 to 46.0.7 in /libs/langchain_v1 (#36619)
docs(langchain): add missing baseten and litellm to init_chat_model (#36562)
release(core): 1.2.26 (#36511)