LangChain (Python)

Changes since langchain==1.3.7

release(langchain): 1.3.8 (#38096) style(core,langchain,langchain-classic,partners): replace double backticks in docstrings (#38095) release(core): 1.4.6 (#38061) chore(langchain): add overloads to create_agent (#34309) chore(infra): bump mypy to 2.1 and unify type-check config across the monorepo (#36470) fix(langchain): support async middleware decorator typing (#34584) fix(langchain): tighten structured output model fallbacks (#38042) release(anthropic): 1.4.5 (#38036) hotfix(core): bump lockfile(s) (#38032) refactor(langchain): refactor test_create_agent_tool_validation (#34443)

Changes since langchain-core==1.4.5

release(core): 1.4.6 (#38061) feat(core,partners): add package version tracking to tracing metadata (#35295) fix(core,openai): normalize v1 streamed tool calls (#35983) chore(infra): bump mypy to 2.1 and unify type-check config across the monorepo (#36470)

Changes since langchain-model-profiles==0.0.5

release(model-profiles): 0.0.6 (#38057) feat(standard-tests): validate tool call chunks during streaming (#34707) hotfix(core): bump lockfile(s) (#38032) release(langchain): 1.3.7 (#38024) release(langchain): 1.3.6 (#38001) release(langchain): 1.3.5 (#37998) hotfix(openai): min core dep (#37990) chore: bump idna from 3.11 to 3.15 in /libs/model-profiles (#37538) chore: bump the minor-and-patch group across 3 directories with 15 updates (#37515) ci(infra): harden Dependabot version-bound preservation (#37510) hotfix: bump lockfiles (#37508) chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/model-profiles (#37382) chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/model-profiles (#37325) chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/model-profiles (#37254) chore: bump types-toml from 0.10.8.20240310 to 0.10.8.20260408 in /libs/model-profiles (#37124) release(fireworks): 1.2.1 (#37113) release(perplexity): 1.2.0 (#37091) chore(docs): update x handle references (#37081) fix(anthropic): restore cache_control on non-direct subclasses (#37057) 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) chore: bump langsmith from 0.6.3 to 0.7.31 in /libs/model-profiles (#36798) chore(deps): bump pytest to 9.0.3 (#36801) chore: bump pytest from 9.0.2 to 9.0.3 in /libs/model-profiles (#36716) chore: add comment explaining pygments>=2.20.0 (#36570) release(core): 1.2.26 (#36511) chore: pygments>=2.20.0 across all packages (CVE-2026-4539) (#36385) chore: bump requests from 2.32.5 to 2.33.0 in /libs/model-profiles (#36240) chore(partners): bump langchain-core min to 1.2.21 (#36183) fix(core,model-profiles): add missing ModelProfile fields, warn on schema drift (#36129) ci: suppress pytest streaming output in CI (#36092) ci: avoid unnecessary dep installs in lint targets (#36046) fix(model-profiles): use posix-compatible substitution in makefile (#35957) chore: bump orjson from 3.11.5 to 3.11.6 in /libs/model-profiles (#35857) feat(model-profiles): new fields + Makefile target (#35788) chore: bump langgraph from 1.0.8 to 1.0.10rc1 in /libs/model-profiles (#35611) chore: bump the minor-and-patch group across 3 directories with 3 updates (#35589) chore: add note to release workflow (#35583) chore: bump the other-deps group across 3 directories with 2 updates (#35512) chore: bump langgraph-checkpoint from 3.0.0 to 4.0.0 in /libs/model-profiles (#35446) chore: bump the other-deps group across 3 directories with 2 updates (#35407) fix(model-profiles): sort generated profiles by model ID for stable diffs (#35344) fix(infra): fix trailing comma regex in profile generation script (#35333) feat(infra): model profile bump tool (#35331) chore: bump model profiles (#35294) chore: bump the other-deps group across 3 directories with 2 updates (#35255) feat(openrouter): add langchain-openrouter provider package (#35211) style: bump ruff version to 0.15 (#35042) chore(deps): bump langsmith from 0.4.38 to 0.6.3 in /libs/model-profiles (#35160) chore(deps): bump the other-deps group across 3 directories with 12 updates (#35127) chore(deps): bump the other-deps group across 3 directories with 8 updates (#35120) feat(model-profiles): add text_inputs and text_outputs (#35084) chore: add make type target (#35015) revert: "chore: add typing target in Makefile" (#35013) chore: add typing target in Makefile (#35012) chore: enrich pyproject.toml files (#34980) chore(deps): bump the uv group across 20 directories with 3 updates (#34941) chore: upgrade urllib3 to 2.6.3 (#34940) style(model-profiles): lint (#34864) chore(deps): bump the uv group across 5 directories with 5 updates (#34785) chore: update twitter URLs (#34736) chore: ban relative imports on all packages (#34691) release(core): 1.2.3 (#34421) release(openai): 1.1.6: update max input tokens for gpt-5 series (#34419) release(openai): 1.1.5 (#34409) feat(infra): add CI check for out of date lockfiles (#34397) feat(anthropic): auto append relevant beta headers for computer use (#34117) revert(model-profiles): update docs link (#34162) fix(model-profiles): update docs link (#34127)

Changes since langchain-core==1.4.4

release(core): 1.4.5 (#38056) feat(standard-tests): validate tool call chunks during streaming (#34707) fix(core): async tracer on_chat_model_start fallback in sync context (#35233) fix(langchain): tighten structured output model fallbacks (#38042)

Changes since langchain-mistralai==1.1.4

release(mistralai): 1.1.5 (#38038) fix(core): support content block tokens in callbacks (#34739) hotfix(openai): min core dep (#37990) 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 (#37870) chore(infra): bump langchain-tests floor to 1.1.9 (#37610) test(mistralai): stabilize integration tests with rate limiting and retries (#37588) chore: bump idna from 3.10 to 3.15 in /libs/partners/mistralai (#37555) chore: bump langsmith from 0.8.4 to 0.8.5 in /libs/partners/mistralai (#37554) ci(infra): harden Dependabot version-bound preservation (#37510) chore: bump langsmith from 0.8.0 to 0.8.4 in /libs/partners/mistralai (#37418) chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/partners/mistralai (#37401) chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/mistralai (#37338) chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/mistralai (#37272)

Changes since langchain-anthropic==1.4.4

release(anthropic): 1.4.5 (#38036) fix(core): support content block tokens in callbacks (#34739) chore(model-profiles): refresh model profile data (#38012) hotfix(openai): min core dep (#37990) 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 (#37771)

Changes since langchain-classic==1.0.7

release(langchain-classic): 1.0.8 (#38033) hotfix(core): bump lockfile(s) (#38032) fix(core): support content block tokens in callbacks (#34739) chore(core): improve typing of Runnable __or__ (#34530) hotfix(openai): min core dep (#37990) chore: bump pyarrow from 21.0.0 to 23.0.1 in /libs/langchain (#37929) chore: bump starlette from 0.49.1 to 1.0.1 in /libs/langchain (#37899) test(langchain,partners): disable pytest-benchmark under xdist to silence PytestBenchmarkWarning (#37901) chore: bump aiohttp from 3.13.4 to 3.14.0 in /libs/langchain (#37889) chore(infra): bump langchain-tests floor to 1.1.9 (#37610) release(standard-tests): 1.1.9 (#37609) chore: bump idna from 3.10 to 3.15 in /libs/langchain (#37537) ci(infra): harden Dependabot version-bound preservation (#37510) hotfix: bump lockfiles (#37508) chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/langchain (#37393) chore(infra): merge v1.4 into master (#37350) chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/langchain (#37327) chore: bump mistune from 3.1.4 to 3.2.1 in /libs/langchain (#37236)

Changes since langchain-core==1.4.3

hotfix(core): bump lockfile(s) (#38032) release(core): 1.4.4 (#38031) fix(core): support content block tokens in callbacks (#34739) chore(core): improve typing of Runnable __or__ (#34530) chore(core): fix some any generics (#34545) fix(core): accept sequence tool error content (#38005) fix(core): type structured tool error handler output (#38003) docs(core): document multimodal handling in get_buffer_string (#37994)

Changes since langchain==1.3.6

release(langchain): 1.3.7 (#38024) style(langchain): add ruff rules ARG (#34435) feat(langchain): add ProviderToolSearchMiddleware (#37969) chore(langchain): activate mypy warn_return_any (#34249) test(langchain): mark legacy trigger view for 2.0 removal (#38002)

Changes since langchain-groq==1.1.2

release(groq): 1.1.3 (#38009) hotfix(openai): min core dep (#37990) test(langchain,partners): disable pytest-benchmark under xdist to silence PytestBenchmarkWarning (#37901) chore(model-profiles): refresh model profile data (#37726) chore(infra): bump langchain-tests floor to 1.1.9 (#37610) chore: bump idna from 3.10 to 3.15 in /libs/partners/groq (#37556) ci(infra): harden Dependabot version-bound preservation (#37510) chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/partners/groq (#37403) chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/groq (#37340) chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/groq (#37276) chore(docs): update x handle references (#37081) hotfix: bump min core versions (#36996) feat(core): add content-block-centric streaming (v2) (#36834) ci(infra): add pytest-xdist to partner test groups (#36988) hotfix(ci): remove nobenchmark flag (#36959) chore(partners): standardize integration test invocation (#36958) chore(deps): bump pytest to 9.0.3 (#36801) chore: bump langsmith from 0.6.3 to 0.7.31 in /libs/partners/groq (#36786) chore(groq): remove Kimi K2 from docstring (#36773) chore: add comment explaining pygments>=2.20.0 (#36570) fix(openai,groq,openrouter): use is-not-None checks in usage metadata token extraction (#36500) chore: pygments>=2.20.0 across all packages (CVE-2026-4539) (#36385) chore(model-profiles): refresh model profile data (#36334) chore: bump requests from 2.32.5 to 2.33.0 in /libs/partners/groq (#36253) chore(partners): bump langchain-core min to 1.2.21 (#36183) fix(core,model-profiles): add missing ModelProfile fields, warn on schema drift (#36129) ci: suppress pytest streaming output in CI (#36092) ci: avoid unnecessary dep installs in lint targets (#36046) chore: bump orjson from 3.11.5 to 3.11.6 in /libs/partners/groq (#35870) feat(model-profiles): new fields + Makefile target (#35788) feat(groq): Strict Mode for Groq (#35029) feat(fireworks,groq,openrouter): add standard model property (#35542) docs(groq): generalize vision models ref (#35536) fix(model-profiles): sort generated profiles by model ID for stable diffs (#35344) chore: bump model profiles (#35294) chore(deps): bump langsmith from 0.4.31 to 0.6.3 in /libs/partners/groq (#35155) feat(model-profiles): add text_inputs and text_outputs (#35084) chore: add make type target (#35015) revert: "chore: add typing target in Makefile" (#35013) chore: add typing target in Makefile (#35012) chore: enrich pyproject.toml files (#34980)

Changes since langchain==1.3.5

release(langchain): 1.3.6 (#38001) fix(langchain): preserve summarization trigger compatibility (#38000)

Changes since langchain==1.3.4

release(langchain): 1.3.5 (#37998) feat(langchain): port AND-capable trigger conditions to SummarizationMiddleware (#34576) hotfix(openai): min core dep (#37990) feat(openai): support apply_patch built-in tool (#37157) chore: bump pyarrow from 21.0.0 to 23.0.1 in /libs/langchain_v1 (#37930) chore: bump dependencies (#37892) chore: bump aiohttp from 3.13.4 to 3.14.0 in /libs/langchain_v1 (#37888)

Changes since langchain-perplexity==1.3.2

release(perplexity): 1.4.0 (#37993) feat(perplexity): bind_tools and Responses-API tool round-trip (#37934) hotfix(openai): min core dep (#37990)

Changes since langchain-openai==1.2.2

hotfix(openai): min core dep (#37990) release(openai): 1.3.0 (#37989) feat(openai): support apply_patch built-in tool (#37157) chore(model-profiles): refresh model profile data (#37973) test(langchain,partners): disable pytest-benchmark under xdist to silence PytestBenchmarkWarning (#37901) chore(model-profiles): refresh model profile data (#37895)

Changes since langchain-core==1.4.2

release(core): 1.4.3 (#37991) feat(openai): support apply_patch built-in tool (#37157)

Changes since langchain-core==1.4.1

release(core): 1.4.2 (#37968) feat(core): deprecate problematic dict() method (#31685)

Changes since langchain-perplexity==1.3.1

release(perplexity): 1.3.2 (#37925) fix(perplexity): serialize ToolMessage and AIMessage.tool_calls (#37911)

Changes since langchain-core==1.4.0

release(core): 1.4.1 (#37922) fix(core): remove Bedrock prevalidation from load (#37909) docs(core): expand and link ModelProfile docstrings (#37904) release(anthropic): 1.4.4 (#37757) chore(core): bump uuid-utils to 0.16.0 (#37699) chore(infra): bump langchain-tests floor to 1.1.9 (#37610) release(standard-tests): 1.1.9 (#37609) chore: bump idna from 3.11 to 3.15 in /libs/core (#37539) ci(infra): harden Dependabot version-bound preservation (#37510) hotfix: bump lockfiles (#37508) docs(core): note override for _get_ls_params (#37503) chore(core,langchain,openai): refresh stale OpenAI model references (#37487) chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/core (#37395) fix(core): accept Serializable constructor-envelope wire shape in _convert_to_message (#37456) fix(core): preserve chunk additional_kwargs across v3 stream assembly (#37435) fix(core): preserve reasoning blocks alongside tool_call in v3 stream (#37434) chore: bump jupyter-server from 2.17.0 to 2.18.0 in /libs/core (#37354) chore: bump mistune from 3.1.4 to 3.2.1 in /libs/core (#37353)

Changes since langchain-deepseek==1.0.1

chore(infra): bump langchain-tests floor to 1.1.9 (#37610) chore: bump idna from 3.10 to 3.15 in /libs/partners/deepseek (#37560) ci(infra): harden Dependabot version-bound preservation (#37510) chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/deepseek (#37341) chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/deepseek (#37282) chore: bump langsmith from 0.7.31 to 0.8.3 in /libs/partners/deepseek (#37283) chore(docs): update x handle references (#37081) chore(model-profiles): refresh model profile data (#37015) chore(model-profiles): refresh model profile data (#37005) hotfix: bump min core versions (#36996) feat(core): add content-block-centric streaming (v2) (#36834) ci(infra): add pytest-xdist to partner test groups (#36988) chore(model-profiles): refresh model profile data (#36982) hotfix(ci): remove nobenchmark flag (#36959) chore(partners): standardize integration test invocation (#36958) chore(deps): bump pytest to 9.0.3 (#36801) chore: bump langsmith from 0.6.3 to 0.7.31 in /libs/partners/deepseek (#36787) chore: add comment explaining pygments>=2.20.0 (#36570) chore(model-profiles): refresh model profile data (#36554) chore: pygments>=2.20.0 across all packages (CVE-2026-4539) (#36385) chore: bump requests from 2.32.5 to 2.33.0 in /libs/partners/deepseek (#36256) chore(partners): bump langchain-core min to 1.2.21 (#36183) fix(core,model-profiles): add missing ModelProfile fields, warn on schema drift (#36129) ci: suppress pytest streaming output in CI (#36092) ci: avoid unnecessary dep installs in lint targets (#36046) chore: bump orjson from 3.11.5 to 3.11.6 in /libs/partners/deepseek (#35868) fix(deepseek): accept base_url as alias for api_base (#35789) feat(model-profiles): new fields + Makefile target (#35788) chore(model-profiles): refresh model profile data (#35646) fix(deepseek): use proper URL parsing for azure endpoint detection (#35455) fix(deepseek): Tool Choice to required for Azure Deployment in case specific function dict is given (#34848) fix(model-profiles): sort generated profiles by model ID for stable diffs (#35344) fix(infra): fix trailing comma regex in profile generation script (#35333) chore: bump model profiles (#35294) chore(deps): bump langsmith from 0.4.31 to 0.6.3 in /libs/partners/deepseek (#35156) feat(model-profiles): add text_inputs and text_outputs (#35084) chore: add make type target (#35015) revert: "chore: add typing target in Makefile" (#35013) chore: add typing target in Makefile (#35012) chore: enrich pyproject.toml files (#34980) chore(deps): bump the uv group across 20 directories with 3 updates (#34941) chore: upgrade urllib3 to 2.6.3 (#34940) chore: update twitter URLs (#34736) chore: ban relative imports on all packages (#34691) fix(openai): filter function_call blocks in token counting (#34396) release(openai): 1.1.6: update max input tokens for gpt-5 series (#34419) release(openai): 1.1.5 (#34409) fix(openai): rely on langchain-core for setting chunk_position (#34404) chore: update core dep in lockfiles (#34216) release: (integration packages): 1.1 (#34088) feat(model-profiles): distribute data across packages (#34024)

Changes since langchain==1.3.3

release(langchain): 1.3.4 (#37861) fix(langchain): improve HITL rejection guidance (#37859)