LangChain Updates & Release Notes

Name: LangChain
Brand: LangChain

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103 updates curated from 1 source by the Releasebot Team. Last updated: Jul 10, 2026

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AI Agent Frameworks

Jul 9, 2026
Date parsed from source:
Jul 9, 2026

First seen by Releasebot:
Jul 10, 2026
LangChain

langchain-fireworks==1.4.4

LangChain releases langchain-fireworks 1.4.4 with prompt cache token usage fixes and updated Fireworks model profile data.
Changes since langchain-fireworks==1.4.3

release(fireworks): 1.4.4 (#38753)

fix(fireworks): report cached prompt token usage (#38751)

chore(deps): refresh lockfiles (#38746)

chore(model-profiles): refresh model profile data (#38663)

chore: bump pytest from 9.1.0 to 9.1.1 in /libs/partners/fireworks (#38594)

chore: bump langsmith from 0.8.18 to 0.9.5 in /libs/partners/fireworks (#38595)

docs(fireworks): clarify prompt-cache session affinity guidance (#38522)

test(fireworks): cover request-level extra headers (#38518)

Original source
Jul 8, 2026
Date parsed from source:
Jul 8, 2026

First seen by Releasebot:
Jul 9, 2026
LangChain

langchain-openai==1.3.4

LangChain fixes OpenAI structured output warnings and improves async loop handling in the latest langchain-openai update.

Changes since langchain-openai==1.3.3

release(openai): 1.3.4 (#38731)

fix(openai): suppress Pydantic serializer warning on structured output parsed field (#37727)

test(openai): skip Codex VCR tests before cassette setup (#38690)

chore: bump the minor-and-patch group across 3 directories with 11 updates (#38587)

chore: bump langgraph-checkpoint from 4.1.0 to 4.1.1 in /libs/partners/openai (#38476)

fix(core): use asyncio.get_running_loop() in async contexts (#38157)

test(openai): clarify async API key sync failure trace (#38379)
Original source
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Jul 8, 2026
Date parsed from source:
Jul 8, 2026

First seen by Releasebot:
Jul 9, 2026
LangChain

langchain-core==1.4.9

LangChain releases langchain-core 1.4.9 with improved error messages, parser bug fixes, async handling updates, and cleanup across core internals, plus dependency bumps for langsmith, jupyterlab, and vcrpy.
Changes since langchain-core==1.4.8

release(core): 1.4.9 (#38728)

fix(core): improve langsmith loader error messages (#35648)

fix(core): output parser bugs in xml.py and pydantic.py (#35641)

style(core): fix some ruff preview rules (#38656)

fix(core): avoid dict shadowing in language models (#38480)

fix(core): _parse_google_docstring mishandling continuation lines with colons (#35680)

fix(core): add messages to bare raise ValueError calls (#38158)

fix(core): use asyncio.get_running_loop() in async contexts (#38157)

chore: bump langsmith from 0.8.0 to 0.8.18 in /libs/core (#38319)

chore: bump jupyterlab from 4.5.7 to 4.5.9 in /libs/core (#38326)

chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/core (#38327)

Original source
Jul 8, 2026
Date parsed from source:
Jul 8, 2026

First seen by Releasebot:
Jul 9, 2026
LangChain

langchain==1.3.12

LangChain fixes interrupt handling, shell middleware, and Anthropic cache retries in this release.

Changes since langchain==1.3.11

release(langchain): 1.3.12 (#38730)
fix(langchain): propagate interrupts through ToolRetryMiddleware (#38722)
fix(langchain): avoid shared process-group kill in shell middleware (#36359)
fix(langchain): sanitize anthropic cache markers on fallback retries (#37867)
style: fix some ruff preview rules in langchain_v1 and standard-tests (#38657)
chore(langchain): add types in agent middleware tests (#38188)
Original source
Jul 5, 2026
Date parsed from source:
Jul 5, 2026

First seen by Releasebot:
Jul 6, 2026
LangChain

langchain-openrouter==0.2.6

LangChain ships langchain-openrouter 0.2.6 with custom header support and refreshed model profile data.

Changes since langchain-openrouter==0.2.5

release(openrouter): 0.2.6 (#38681)

fix(openrouter): support default_headers for custom HTTP header injection (#36582)

chore(model-profiles): refresh model profile data (#38663)
Original source
Similar to LangChain with recent updates:
Jul 5, 2026
Date parsed from source:
Jul 5, 2026

First seen by Releasebot:
Jul 6, 2026
LangChain

langchain-mistralai==1.1.6

LangChain releases langchain-mistralai 1.1.6 with citation metadata surfaced from chat responses, stop sequence support, refreshed model profiles, and updated tracing metadata and package tracking across core and partners.

Changes since langchain-mistralai==1.1.5

release(mistralai): 1.1.6 (#38684)
feat(mistralai): surface citation metadata from chat responses (#37008)
chore(model-profiles): refresh model profile data (#38663)
chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/partners/mistralai (#38302)
chore: bump langsmith from 0.8.5 to 0.8.18 in /libs/partners/mistralai (#38304)
chore(model-profiles): refresh model profile data (#38210)
docs: refresh README installation and resources (#38119)

release(core): 1.4.7 (#38111)

fix(core,partners): rename package version trace metadata (#38110)
style(core,langchain,langchain-classic,partners): replace double backticks in docstrings (#38095)

release(core): 1.4.6 (#38061)

feat(core,partners): add package version tracking to tracing metadata (#35295)
chore(infra): bump mypy to 2.1 and unify type-check config across the monorepo (#36470)
feat(mistralai): support stop sequences (#38047)
Original source
Jun 29, 2026
Date parsed from source:
Jun 29, 2026

First seen by Releasebot:
Jun 30, 2026
LangChain

langchain-openrouter==0.2.5

LangChain ships OpenRouter 0.2.5 with fixes for repeated finish metadata and Responses reasoning IDs.

Changes since langchain-openrouter==0.2.4

release(openrouter): 0.2.5 (#38553)
fix(openrouter): deduplicate repeated finish metadata (#38552)
fix(openrouter): strip Responses reasoning IDs (#38383)
Original source
Jun 26, 2026
Date parsed from source:
Jun 26, 2026

First seen by Releasebot:
Jun 27, 2026
LangChain

langchain-anthropic==1.4.8

LangChain ships Anthropic and core fixes, including better content block handling and clearer ValueError messages.

Changes since langchain-anthropic==1.4.7

release(anthropic): 1.4.8 (#38490)

fix(anthropic): keep initial text on content_block_start (#38442)

chore: bump langgraph-checkpoint from 4.1.0 to 4.1.1 in /libs/partners/anthropic (#38479)

fix(core): add messages to bare raise ValueError calls (#38158)
Original source
Jun 26, 2026
Date parsed from source:
Jun 26, 2026

First seen by Releasebot:
Jun 26, 2026
LangChain

langchain-fireworks==1.4.3

LangChain releases langchain-fireworks 1.4.3 with refreshed model profiles, updated dependencies, and tracing metadata fixes across the Fireworks integration. It also includes core release updates and documentation refreshes.

Changes since langchain-fireworks==1.4.2

release(fireworks): 1.4.3

chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/partners/fireworks (#38314)
chore: bump langsmith from 0.8.16 to 0.8.18 in /libs/partners/fireworks (#38313)
chore: bump langsmith from 0.8.14 to 0.8.16 in /libs/partners/fireworks (#38235)
chore: bump pytest from 9.0.3 to 9.1.0 in /libs/partners/fireworks (#38233)
chore(model-profiles): refresh model profile data (#38210)
chore(model-profiles): refresh model profile data (#38191)
chore(model-profiles): refresh model profile data (#38133)
docs: refresh README installation and resources (#38119)

release(core): 1.4.7 (#38111)

fix(core,partners): rename package version trace metadata (#38110)
style(core,langchain,langchain-classic,partners): replace double backticks in docstrings (#38095)
chore: bump langsmith from 0.8.9 to 0.8.14 in /libs/partners/fireworks (#38093)

release(core): 1.4.6 (#38061)

feat(core,partners): add package version tracking to tracing metadata (#35295)
chore(infra): bump mypy to 2.1 and unify type-check config across the monorepo (#36470)
feat(standard-tests): validate tool call chunks during streaming (#34707)
chore(partners): bump locks (#38052)
hotfix(openai): min core dep (#37990)
chore(model-profiles): refresh model profile data (#37973)
chore(model-profiles): refresh model profile data (#37936)
test(langchain,partners): disable pytest-benchmark under xdist to silence PytestBenchmarkWarning (#37901)
fix(partners): cap aiohttp below 3.14 for vcrpy compat (#37898)
chore(model-profiles): refresh model profile data (#37895)
chore: bump aiohttp from 3.13.5 to 3.14.0 in /libs/partners/fireworks (#37882)
chore: bump langsmith from 0.8.7 to 0.8.9 in /libs/partners/fireworks (#37883)
chore: bump langsmith from 0.8.0 to 0.8.7 in /libs/partners/fireworks (#37781)
chore: bump requests from 2.34.0 to 2.34.2 in /libs/partners/fireworks (#37782)
Original source
Jun 23, 2026
Date parsed from source:
Jun 23, 2026

First seen by Releasebot:
Jun 23, 2026
LangChain

langchain-openrouter==0.2.4

LangChain releases langchain-openrouter 0.2.4 with improved OpenRouter support, including parallel_tool_calls on bind_tools, a higher OpenRouter floor, and refreshed model profile data. The update also includes dependency bumps and tracing metadata improvements across the stack.

Changes since langchain-openrouter==0.2.3

release(openrouter): 0.2.4 (#38381)
chore(openrouter): bump openrouter floor to 0.9.2, drop file workaround (#38216)
test(openrouter): cover cache_control passthrough on tool defs (#38215)
feat(openrouter): surface parallel_tool_calls on bind_tools (#38214)
chore(model-profiles): refresh model profile data (#38341)
chore(model-profiles): refresh model profile data (#38331)
chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/partners/openrouter (#38291)
chore: bump langsmith from 0.8.5 to 0.8.18 in /libs/partners/openrouter (#38292)
chore(model-profiles): refresh model profile data (#38274)
chore(model-profiles): refresh model profile data (#38244)
chore(model-profiles): refresh model profile data (#38210)
chore(model-profiles): refresh model profile data (#38160)
chore(model-profiles): refresh model profile data (#38133)
docs: refresh README installation and resources (#38119)
release(core): 1.4.7 (#38111)
fix(core,partners): rename package version trace metadata (#38110)
chore(model-profiles): refresh model profile data (#38100)
style(core,langchain,langchain-classic,partners): replace double backticks in docstrings (#38095)
release(core): 1.4.6 (#38061)
feat(core,partners): add package version tracking to tracing metadata (#35295)
chore(infra): bump mypy to 2.1 and unify type-check config across the monorepo (#36470)
feat(standard-tests): validate tool call chunks during streaming (#34707)
fix(langchain): tighten structured output model fallbacks (#38042)
test(partners): account for warning behavior in partner tests (#38046)
chore(model-profiles): refresh model profile data (#38012)
hotfix(openai): min core dep (#37990)
chore(model-profiles): refresh model profile data (#37973)
chore(model-profiles): refresh model profile data (#37958)
chore(model-profiles): refresh model profile data (#37936)
chore(model-profiles): refresh model profile data (#37916)
test(langchain,partners): disable pytest-benchmark under xdist to silence PytestBenchmarkWarning (#37901)
chore(model-profiles): refresh model profile data (#37895)
chore(model-profiles): refresh model profile data (#37870)
chore(model-profiles): refresh model profile data (#37852)
chore(model-profiles): refresh model profile data (#37802)
chore(model-profiles): refresh model profile data (#37791)
chore(model-profiles): refresh model profile data (#37771)
chore(model-profiles): refresh model profile data (#37726)
chore(model-profiles): refresh model profile data (#37712)
chore(model-profiles): refresh model profile data (#37694)
chore(model-profiles): refresh model profile data (#37650)
chore(model-profiles): refresh model profile data (#37626)
chore(infra): bump langchain-tests floor to 1.1.9 (#37610)
chore: bump idna from 3.11 to 3.15 in /libs/partners/openrouter (#37546)
chore: bump langsmith from 0.8.4 to 0.8.5 in /libs/partners/openrouter (#37547)
chore(model-profiles): refresh model profile data (#37524)
ci(infra): harden Dependabot version-bound preservation (#37510)
chore(core,langchain,openai): refresh stale OpenAI model references (#37487)
chore(model-profiles): refresh model profile data (#37477)
chore(model-profiles): refresh model profile data (#37466)
chore: bump langsmith from 0.8.0 to 0.8.4 in /libs/partners/openrouter (#37414)
chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/partners/openrouter (#37397)
chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/openrouter (#37352)
chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/openrouter (#37263)
chore(model-profiles): refresh model profile data (#37247)
chore(model-profiles): refresh model profile data (#37231)
chore(model-profiles): refresh model profile data (#37182)
chore(model-profiles): refresh model profile data (#37162)
chore(model-profiles): refresh model profile data (#37148)
Original source
Jun 22, 2026
Date parsed from source:
Jun 22, 2026

First seen by Releasebot:
Jun 23, 2026
LangChain

langchain-openai==1.3.3

LangChain releases langchain-openai 1.3.3 with OpenAI fixes that drop response item IDs when store is false, remove stop from Responses API payloads, and apply strict tool settings only where appropriate for OpenAI-compatible models.

Changes since langchain-openai==1.3.2

release(openai): 1.3.3 (#38375)

fix(openai): drop response item ids when store is false (#38372)

fix(langchain,openai): only set strict=True on tools for OpenAI-compatible models in ProviderStrategy (#38370)

test(openai): clarify expected strict schema error (#38338)

fix(openai): drop stop from Responses API payload (#38336)

chore: bump langsmith from 0.8.5 to 0.8.18 in /libs/partners/openai (#38293)

chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/partners/openai (#38294)

chore(model-profiles): refresh model profile data (#38274)

test(openai): vcr embedding raw equivalence tests (#38199)
Original source
Jun 22, 2026
Date parsed from source:
Jun 22, 2026

First seen by Releasebot:
Jun 23, 2026
LangChain

langchain-anthropic==1.4.7

LangChain ships core and Anthropic 1.4.7 updates with trace metadata fixes, dependency bumps, and doc refreshes.

Changes since langchain-anthropic==1.4.6

hotfix(anthropic): regenerate cassette (#38376)

release(anthropic): 1.4.7 (#38373)

chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/partners/anthropic (#38324)

chore: bump langsmith from 0.8.5 to 0.8.18 in /libs/partners/anthropic (#38325)

docs(anthropic): clarify prompt caching middleware docstring (#38206)

docs: refresh README installation and resources (#38119)

test(core,langchain): update tests for explicit deserialization allowlists (#38118)

release(core): 1.4.7 (#38111)

fix(core,partners): rename package version trace metadata (#38110)
Original source
Jun 22, 2026
Date parsed from source:
Jun 22, 2026

First seen by Releasebot:
Jun 23, 2026
LangChain

langchain==1.3.11

LangChain fixes OpenAI-compatible tool handling in ProviderStrategy and updates key dependencies in this release.
Changes since langchain==1.3.10

release(langchain): 1.3.11 (#38377)

fix(langchain,openai): only set strict=True on tools for OpenAI-compatible models in ProviderStrategy (#38370)

chore: bump pydantic-settings from 2.12.0 to 2.14.2 in /libs/langchain_v1 (#38279)

chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/langchain_v1 (#38280)

chore: bump langsmith from 0.8.9 to 0.8.18 in /libs/langchain_v1 (#38281)

docs(langchain): document summarization prompt contract (#38256)

Original source
Jun 18, 2026
Date parsed from source:
Jun 18, 2026

First seen by Releasebot:
Jun 18, 2026
LangChain

langchain-core==1.4.8

LangChain releases core 1.4.8 with dependency bumps, faster tool schema handling, and fixes for v3 streaming usage token details and type safety. It also drops Python <3.10 code in langchain-classic and refreshes docs and tests.

Changes since langchain-core==1.4.7

chore: bump jupyter-server from 2.18.0 to 2.20.0 in /libs/core (#38252)

chore: bump tornado from 6.5.6 to 6.5.7 in /libs/core (#38184)

chore: bump bleach from 6.3.0 to 6.4.0 in /libs/core (#38198)

release(core): 1.4.8 (#38254)

refactor(langchain-classic): remove code for Python < 3.10 (#38194)

perf(core): memoize BaseTool.tool_call_schema subset model and cache model_json_schema (#38073)

style(core): fix style in langchain_core/_security (#38189)

fix(core): preserve usage token details in v3 streaming events (#38021)

fix(core): disallow_any_generics (#38156)

chore(core): add mypy warn_unreachable (#38109)

docs: refresh README installation and resources (#38119)

test(core,langchain): update tests for explicit deserialization allowlists (#38118)
Original source
Jun 18, 2026
Date parsed from source:
Jun 18, 2026

First seen by Releasebot:
Jun 18, 2026
LangChain

langchain==1.3.10

LangChain releases 1.3.10 with dependency updates, summary format fixes, and better provider strategy detection for dated GPT-5.2 and GPT-5.4 snapshots, alongside package updates across OpenAI, core, and Anthropic integrations.

Changes since langchain==1.3.9

release(langchain): 1.3.10 (#38255)

chore: bump cryptography from 46.0.7 to 48.0.1 in /libs/langchain_v1 (#38176)

chore: bump aiohttp from 3.14.0 to 3.14.1 in /libs/langchain_v1 (#38179)

fix(langchain): switch summary format (#38171)

fix(langchain): detect provider strategy for dated gpt-5.2/gpt-5.4 snapshots (#38222)

chore(langchain): improve typing in tests (#38163)

chore: bump pyjwt from 2.12.0 to 2.13.0 in /libs/langchain_v1 (#38168)

release(openai): 1.3.2 (#38130)

hotfix(openai): switch version (#38123)

release(openai): 1.4.0 (#38120)

docs: refresh README installation and resources (#38119)

test(core,langchain): update tests for explicit deserialization allowlists (#38118)

release(core): 1.4.7 (#38111)

release(anthropic): 1.4.6 (#38105)
Original source