Changes since langchain==1.3.13

release(langchain): 1.3.14 (#38883)
fix(langchain): only retry retryable exceptions in ToolRetryMiddleware (#38845)
feat(langchain): ToolErrorMiddleware (#38781)

Changes since langchain==1.3.12

release(langchain): 1.3.13 (#38787)
feat(langchain): add meta extra and support langchain-meta in init_chat_model (#38786)
feat(openai): support explicit prompt caching (#38762)
chore(deps): refresh lockfiles (#38746)

Changes since langchain-openai==1.3.4

release(openai): 1.3.5 (#38785)
feat(openai): support explicit prompt caching (#38762)
chore(model-profiles): refresh model profile data (#38774)

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)

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)

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)

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)

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)

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)

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)