LangChain Release Notes

Name: LangChain
Brand: LangChain

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207 release notes curated from 2 sources by the Releasebot Team. Last updated: Aug 14, 2026

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LangChain Products

Aug 14, 2026
Date parsed from source:
Aug 14, 2026

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Aug 14, 2026
LangChain

langchain-openrouter==0.2.8

LangChain releases langchain-openrouter 0.2.8 with refreshed model profile data, preserves cost metadata in usage chunks, and now keeps provider details in response metadata for cleaner OpenRouter handling.

Changes since langchain-openrouter==0.2.7

release(openrouter): 0.2.8 (#39658)

chore(model-profiles): refresh model profile data (#39646)

chore(model-profiles): refresh model profile data (#39625)

fix(openrouter): preserve cost metadata in usage chunks (#39338)

chore(model-profiles): refresh model profile data (#39609)

chore(model-profiles): refresh model profile data (#39579)

chore(model-profiles): refresh model profile data (#39430)

chore(model-profiles): refresh model profile data (#39344)

chore(model-profiles): refresh model profile data (#39318)

feat(openrouter): preserve provider in response metadata (#39301)

chore(model-profiles): refresh model profile data (#39299)

chore(model-profiles): refresh model profile data (#39239)

chore(model-profiles): refresh model profile data (#39166)

chore(model-profiles): refresh model profile data (#39141)

chore(model-profiles): refresh model profile data (#39105)

chore(model-profiles): refresh model profile data (#39084)

chore(model-profiles): refresh model profile data (#39050)

chore(model-profiles): refresh model profile data (#39036)
Original source
Aug 14, 2026
Date parsed from source:
Aug 14, 2026

First seen by Releasebot:
Aug 14, 2026
LangChain

langchain-openai==1.5.1

LangChain fixes streamed encrypted reasoning and adds LangSmith Gateway CI support.

Changes since langchain-openai==1.5.0

release(openai): 1.5.1 (#39653)

fix(openai): preserve streamed encrypted reasoning (#39635)

chore(infra): support langsmith gateway in CI (#39651)
Original source
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Aug 14, 2026
Date parsed from source:
Aug 14, 2026

First seen by Releasebot:
Aug 14, 2026
LangChain

langchain-core==1.5.5

LangChain ships core fixes in 1.5.5, tightening batch behavior, tool input validation, chunk merging, async model handling, and error cleanup while also adding an explicit httpx dependency.

Changes since langchain-core==1.5.4

release(core): 1.5.5 (#39655)

fix(core): make abatch_iterate consistent with batch_iterate for None and zero size (#39367)

fix(core): respect pydantic aliases when validating tool inputs (#39572)

fix(core): issues in merging chunks (#39535)

fix(core): handle v1 base model validation in async path (#39576)

fix(core): handle tool descriptions for infer_schema=False (#39573)

fix(core): clear usage metadata callback on exceptions in context manager (#39616)

fix(core): handle falsy LLM and chat model caches (#39283)

chore(core): add httpx as an explicit dep (#39612)

fix(core): preserve non-str/non-dict items in DictPromptTemplate list values (#39588)

fix(core): raise ValueError when explicit tool_outputs length mismatches tool_calls in tool_example_to_messages (#39142)

fix(core): guard malformed Anthropic content blocks (#38670)
Original source
Aug 13, 2026
Date parsed from source:
Aug 13, 2026

First seen by Releasebot:
Aug 13, 2026
LangChain

langchain-openai==1.5.0

LangChain adds OpenAI 3.0 SDK support in the latest langchain-openai release.

Changes since langchain-openai==1.4.3

release(openai): 1.5.0 (#39629)

feat(openai): support openai 3.0 SDK (#39613)

chore(partners): bump langgraph floor in openai and huggingface lockfiles (#39617)
Original source
Aug 13, 2026
Date parsed from source:
Aug 13, 2026

First seen by Releasebot:
Aug 13, 2026
LangChain

langchain-anthropic==1.5.6

LangChain fixes Anthropic tool result normalization and corrects model profile data for Fable 5, Sonnet 5, and Opus 4.1.
Changes since langchain-anthropic==1.5.5

release(anthropic): 1.5.6 (#39622)

fix(anthropic): normalize tool_search_tool_result blocks (#39621)

fix(anthropic): correct model profile data for Fable 5, Sonnet 5, Opus 4.1 (#39604)

Original source
Similar to LangChain with recent updates:
Aug 11, 2026
Date parsed from source:
Aug 11, 2026

First seen by Releasebot:
Aug 13, 2026
LangChain

langchain-core==1.5.4

LangChain releases core 1.5.4 with broad stability fixes, including Pydantic 2.14 compatibility, safer StructuredPrompt behavior, better tool and runnable schema handling, cleaner streaming tracer cleanup, and improved file block and callback handling.

Changes since langchain-core==1.5.3

release(core): 1.5.4 (#39592)

fix(core): compat with pydantic 2.14 (#39328)

fix(core): stop StructuredPrompt from mutating caller kwargs (#39174)

fix(core): preserve flat tool args schema for RootModel runnables (#39307)

fix(core): close internally created event loops in streaming tracers (#39222)

chore: bump the minor-and-patch group across 3 directories with 7 updates (#39187)

fix(core): preserve OpenAI file blocks (#39205)

fix(core): document reserved argument names for tools (#39207)

fix(core): handle injected args for subclasses of BaseTool (#39202)

fix(core): respect include_injected=False with filter_args (#39200)

fix(core): redact streaming callback options (#39179)

fix(core): type text stream projections (#39170)

chore(infra): add missing LICENSE files to publishable packages (#39146)
Original source
Aug 11, 2026
Date parsed from source:
Aug 11, 2026

First seen by Releasebot:
Aug 13, 2026
LangChain

langchain-anthropic==1.5.5

LangChain fixes Anthropic usage metadata, Claude file-tool rename errors, and credential handling in a new 1.5.5 release.

Changes since langchain-anthropic==1.5.4

release(anthropic): 1.5.5 (#39597)

fix(anthropic): report reasoning tokens in usage metadata (#39590)

fix(anthropic): fix KeyError on rename in Claude file-tool middleware (#39293)

chore(model-profiles): refresh model profile data (#39299)

fix(anthropic): clearer error when no credentials are configured (#39285)
Original source
Aug 11, 2026
Date parsed from source:
Aug 11, 2026

First seen by Releasebot:
Aug 13, 2026
LangChain

langchain==1.3.15

LangChain ships a release focused on agent middleware, tool handling, and structured output reliability, while adding LangSmith provider support in init_chat_model and new state and reasoning parameters. It also brings a stack of fixes for checkpointing, approvals, and model call flow.

Changes since langchain==1.3.14

release(langchain): 1.3.15 (#39595)
feat(langchain): expose trace_policy on AgentMiddleware (#38910)
chore(langchain): fix type errors in tests (#39589)
chore: bump h2 from 4.3.0 to 4.4.1 in /libs/langchain_v1 (#39324)
fix(langchain): preserve history on SummarizationMiddleware summary failure (#39268)
fix(langchain): handle import error in LLMToolEmulator by model (#39290)
refactor(langchain): update doc strings (#39305)
feat(langchain): add state_schema param to wrap_tool_call (#39292)
fix(langchain): re-export PIIMatch from middleware package (#39291)
fix(langchain): restrict narrowed ToolStrategy in bound tools (#39259)
feat(langchain): filter internal middleware model calls from messages projection (#39252)
chore: bump aiohttp from 3.14.1 to 3.14.3 in /libs/langchain_v1 (#39242)
chore: bump cryptography from 48.0.1 to 50.0.0 in /libs/langchain_v1 (#39240)
test(langchain): regression test for shell tool + checkpointer msgpack error (#39267)
fix(langchain): handle malformed structured-output responses (#39245)
fix(langchain): prevent orphaned tool_calls in ToolCallLimitMiddleware end behavior (#39258)
fix(langchain): add aliases for bedrock mantle chat models (#39260)
feat(langchain): add LangSmith provider to init_chat_model (#39224)
fix(langchain): clear stale structured_response between checkpointed turns (#39248)
fix(langchain): stop HITL approval gates from silently failing open (#39247)
chore: bump the minor-and-patch group across 3 directories with 7 updates (#39187)
fix(langchain): propagate model middleware control flow (#39199)
fix(langchain): update Anthropic config test (#39172)
chore: bump pyasn1 from 0.6.3 to 0.6.4 in /libs/langchain_v1 (#39026)
chore: bump pillow from 12.2.0 to 12.3.0 in /libs/langchain_v1 (#38994)
feat(core): add reasoning_effort as a standard chat model parameter (#38887)
docs(langchain): clarify ToolRetryMiddleware exception handling (#38884)
Original source
Aug 11, 2026
Date parsed from source:
Aug 11, 2026

First seen by Releasebot:
Aug 13, 2026
LangGraph by LangChain

langgraph==1.2.11

LangGraph releases 1.2.11 with trace_policy now exposed on add_node, plus checkpoint updates and fixes across checkpoint, checkpoint-postgres, and checkpoint-sqlite. It also includes dependency bumps and test and lint maintenance.
Changes since 1.2.10

release(langgraph): 1.2.11 (#8595)

feat(langgraph): expose trace_policy on add_node (#8523)

chore(deps): bump the minor-and-patch group across 1 directory with 7 updates (#8533)

chore(deps): bump the minor-and-patch group across 1 directory with 5 updates (#8532)

release(checkpoint-postgres): 3.1.2 (#8565)

release(checkpoint): 4.2.0 (#8563)

fix(checkpoint): collect writes at plain-value seed in delta channel history (#8526)

chore: enforce PLC0415 in tests for the remaining packages (#8547)

test(checkpoint-postgres,checkpoint-sqlite): run the conformance suite (#8537)

chore: enable RUF100 and clear unused noqa directives (#8546)

chore(deps-dev): bump types-requests from 2.33.0.20260518 to 2.33.0.20260712 in /libs/langgraph (#8502)

chore(deps): bump cryptography from 48.0.1 to 50.0.0 in /libs/langgraph (#8528)

release(checkpoint-sqlite): 3.1.1 (#8481)

release(checkpoint-postgres): 3.1.1 (#8480)

Original source
Aug 10, 2026
Date parsed from source:
Aug 10, 2026

First seen by Releasebot:
Aug 11, 2026
LangChain

langchain-openai==1.4.3

LangChain fixes invalid tool calls and updates Responses API guidance and docstrings in the langchain-openai 1.4.3 release.

Changes since langchain-openai==1.4.2

release(openai): 1.4.3 (#39485)

fix(openai): filter invalid tool calls from content (#39366)

chore(openai): update guidance for responses API for OpenAI-compatible providers (#39327)

chore(openai): update docstring for include_response_headers (#39326)
Original source
Aug 7, 2026
Date parsed from source:
Aug 7, 2026

First seen by Releasebot:
Aug 9, 2026
LangGraph by LangChain

langgraph-checkpoint-postgres==3.1.2

LangGraph releases checkpoint-postgres 3.1.2 and checkpoint 4.2.0 with conformance tests and a plain-value seed fix.
Changes since checkpointpostgres==3.1.1

release(checkpoint-postgres): 3.1.2 (#8565)

release(checkpoint): 4.2.0 (#8563)

test(checkpoint-postgres,checkpoint-sqlite): run the conformance suite (#8537)

fix(checkpoint-postgres): find plain-value seeds when walking delta history (#8535)

chore: enable RUF100 and clear unused noqa directives (#8546)

chore(checkpoint-postgres,checkpoint-sqlite): enable PLC0415 lint rule (#8540)

chore(deps): bump the minor-and-patch group in /libs/checkpoint-postgres with 5 updates (#8497)

Original source
Aug 7, 2026
Date parsed from source:
Aug 7, 2026

First seen by Releasebot:
Aug 9, 2026
LangGraph by LangChain

langgraph-checkpoint==4.2.0

LangGraph releases 4.2.0 with checkpoint improvements, including a fix for collecting writes in delta channel history and an opt-in omit_expired option for checkpoint and checkpoint-postgres to skip expired rows on read.

Changes since checkpoint==4.1.1

release(checkpoint): 4.2.0 (#8563)

fix(checkpoint): collect writes at plain-value seed in delta channel history (#8526)

chore: enforce PLC0415 in tests for the remaining packages (#8547)

chore: enable RUF100 and clear unused noqa directives (#8546)

chore(deps): bump the minor-and-patch group in /libs/checkpoint with 4 updates (#8490)

feat(checkpoint,checkpoint-postgres): add opt-in omit_expired to skip expired rows on read (#8354)

chore(deps): bump the minor-and-patch group in /libs/checkpoint with 5 updates (#8248)

chore(deps): bump langsmith from 0.8.0 to 0.8.18 in /libs/checkpoint (#8173)

docs: standardize package README.md structure (#8064)

chore: migrate Python type checking to ty (#8002)

chore(deps-dev): bump the major group in /libs/checkpoint with 2 updates (#7967)

chore(deps): bump the minor-and-patch group in /libs/checkpoint with 3 updates (#7960)
Original source
Aug 7, 2026
Date parsed from source:
Aug 7, 2026

First seen by Releasebot:
Aug 8, 2026
LangChain

langchain-openai==1.4.2

LangChain releases langchain-openai 1.4.2 with OpenAI fixes for context windows, content blocks, text options, and MCP authorization.

Changes since langchain-openai==1.4.1

release(openai): 1.4.2 (#39322)

fix(openai): handle ContextWindowExceededError (#39300)

chore: bump the minor-and-patch group across 3 directories with 7 updates (#39187)

fix(openai): filter langchain-generated content block IDs (#39209)

fix(openai): preserve Responses text options (#39204)

fix(openai): redact MCP authorization (#39155)

chore(model-profiles): refresh model profile data (#39050)
Original source
Aug 5, 2026
Date parsed from source:
Aug 5, 2026

First seen by Releasebot:
Aug 6, 2026
LangChain

langchain-anthropic==1.5.4

LangChain ships Anthropic fixes and adds user_profile_id, improving tool schema handling and preserving tool_choice.

Changes since langchain-anthropic==1.5.3

release(anthropic): 1.5.4 (#39277)

fix(anthropic): handle tool schemas with unsupported top-level composition (#39273)

chore: bump the minor-and-patch group across 3 directories with 7 updates (#39187)

fix(anthropic): preserve caller tool_choice (#39206)

feat(anthropic): add user_profile_id convenience attribute (#39148)
Original source
Jul 30, 2026
Date parsed from source:
Jul 30, 2026

First seen by Releasebot:
Jul 31, 2026
LangChain

langchain-core==1.5.3

LangChain ships a core update that fixes gateway auth by falling back to LANGSMITH_API_KEY.
Changes since langchain-core==1.5.2

release(core): 1.5.3 (#39145)

fix(core): fall back to LANGSMITH_API_KEY for gateway (#39115)

Original source