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Changelog

onnx

Open standard for machine learning interoperability

onnx/onnx·

21k4kPythonApache-2.0

·Website

aiartificial-intelligencedeep-learningdeep-neural-networksdnnkeras+7

Last updated 23 days ago

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NewAugust 26, 2025

v1.19.0

ONNX v1.19.0 is now available with exciting new features! We would like to thank everyone who contributed to this release! Please visit onnx.ai to learn more about ONNX and associated projects.

Key Updates

IR Version 12

Added FLOAT8E8M0 type

ai.onnx Opset 24

Added Swish op
Added TensorScatter op and updated Attention op for in-place KV cache updates
Enabled FLOAT8E8M0 for QuantizeLinear, DequantizeLinear, Cast, CastLike, Constant, ConstantOfShape, Identity, Reshape, Shape, Size, If, Loop, Scan, Flatten, Pad, Squeeze, Unsqueeze, and Transpose.
Enabled BF16 for TopK and SplitToSequence.

Other

Added dependency on ml-dtypes
BUILD_ONNX_PYTHON symbol is deprecated (we be removed for 1.20). Please, use ONNX_BUILD_PYTHON instead.

What's Changed

Breaking Changes and Deprecations

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v1.19.0 - onnx Release Notes | AnnounceHQ

Clarify the axes input of [un]Squeeze to be 1D tensors by @justinchuby in https://github.com/onnx/onnx/pull/6888
Clarify that variable shadowing is not allowed by @justinchuby in https://github.com/onnx/onnx/pull/6955
Clarify Mod operator by @cbourjau in https://github.com/onnx/onnx/pull/6973
Fix typo regarding Attention scale in the spec by @yuanyao-nv in https://github.com/onnx/onnx/pull/6984
Clarify default value for ratio input of Dropout operator by @robertknight in https://github.com/onnx/onnx/pull/7032
Correct dtype attribute docs for EyeLike operator by @robertknight in https://github.com/onnx/onnx/pull/7031
Update float8 table for the Cast op spec by @justinchuby in https://github.com/onnx/onnx/pull/7085
Document Multi-Device Configuration proto specifications in IR.md by @Copilot in https://github.com/onnx/onnx/pull/7056
Add FLOAT8E8M0 data type by @yuanyao-nv in https://github.com/onnx/onnx/pull/7030
Enable float8e8m0 for Q/DQ, and other ops by @yuanyao-nv in https://github.com/onnx/onnx/pull/7120
Update the saturating behavior for E4M3FNUZ/E5M2FNUZ in Cast and CastLike by @justinchuby in https://github.com/onnx/onnx/pull/7130
Fix ELU and Softplus operators to support tensors of any shape by @Copilot in https://github.com/onnx/onnx/pull/7136
Fix Shape operator specification: correct range bounds and document start > end behavior by @Copilot in https://github.com/onnx/onnx/pull/7132
Fix Attention 3D, reference implementation and c++ expansion by @xadupre in https://github.com/onnx/onnx/pull/7142
Fix RMS norm function definition by @justinchuby in https://github.com/onnx/onnx/pull/7135
Fix spec for ReduceSumSquare and other reduce ops when noop_with_empty_axes is set by @Copilot in https://github.com/onnx/onnx/pull/7137
Add bf16 support to TopK and SplitToSequence by @gramalingam in https://github.com/onnx/onnx/pull/7158
Add Swish operator by @isdanni in https://github.com/onnx/onnx/pull/7172
Add TensorScatter op for in-place kv cache update by @yuanyao-nv in https://github.com/onnx/onnx/pull/7114
Fix Resize operator document by @kcvlex in https://github.com/onnx/onnx/pull/6686
Add kv_nonpad_seqlen input to Attention by @yuanyao-nv in https://github.com/onnx/onnx/pull/7164

Use ONNX_WERROR=ON in all jobs by @cyyever in https://github.com/onnx/onnx/pull/6825
Cleanup CMake scripts by @cyyever in https://github.com/onnx/onnx/pull/6828
Better support of sanitizers by @cyyever in https://github.com/onnx/onnx/pull/6826
Remove the pull trigger in source dist test by @justinchuby in https://github.com/onnx/onnx/pull/6861
Use CONFIG to find protobuf by @ktf in https://github.com/onnx/onnx/pull/6840
Update to checkout submodules properly by @justinchuby in https://github.com/onnx/onnx/pull/6884
Improve lint CI by @justinchuby in https://github.com/onnx/onnx/pull/6899
Remove win arm64 from main.yml by @andife in https://github.com/onnx/onnx/pull/6906
Enhance Build Process and CI Configuration (combine pipelines) by @andife in https://github.com/onnx/onnx/pull/6926
Update and rename Install_test.yml to install_test.yml by @andife in https://github.com/onnx/onnx/pull/6950
Update CMake to 3.24 and use LINK_LIBRARY:WHOLE_ARCHIVE by @cyyever in https://github.com/onnx/onnx/pull/6934
replace requirements_release with requirements_release_build in codeql.yml by @andife in https://github.com/onnx/onnx/pull/6958
Add backend node testing for Lpnormalization op by @jagadeeshvx in https://github.com/onnx/onnx/pull/6997
Refine pybind11 integration by @cyyever in https://github.com/onnx/onnx/pull/7024
Use pybind11_add_module by @cyyever in https://github.com/onnx/onnx/pull/7034
Update input and output tensors in pb files to match the model by @amarin16 in https://github.com/onnx/onnx/pull/7074
Generate the test data that should be in the repo but was omitted by @justinchuby in https://github.com/onnx/onnx/pull/7099
Fix cast test cases by @justinchuby in https://github.com/onnx/onnx/pull/7102
Test ArgMax with multiple maximal values and select_last_index = 0 by @meilofveeningen-rl in https://github.com/onnx/onnx/pull/7104
Add more test cases with attention by @xadupre in https://github.com/onnx/onnx/pull/7117
Update CMakeLists.txt to prevent ICE protobuf failure by @justinchuby in https://github.com/onnx/onnx/pull/7121
Fix shared module name when cross-compiling by @zboszor in https://github.com/onnx/onnx/pull/7026
Add missing symbols for onnx-mlir by @Sunny-Anand in https://github.com/onnx/onnx/pull/7179
improve condition in create_release.yml by @andife in https://github.com/onnx/onnx/pull/7196

Merge Windows CI jobs by @cyyever in https://github.com/onnx/onnx/pull/6827
Improve source build testing by @andife in https://github.com/onnx/onnx/pull/6831
use HEAD_SHA instead of HEAD_REF in auto_update_doc.yml by @mshudrak in https://github.com/onnx/onnx/pull/6809
Fix clang-tidy warnings by @cyyever in https://github.com/onnx/onnx/pull/6832
Update pypa / manylinux2014_x86_64 in release_linux_x86_64.yml to 2025.03.22-2 by @andife in https://github.com/onnx/onnx/pull/6833
Fix the ONNX_BUILD_CUSTOM_PROTOBUF bug introduced by PR#6495. by @cainbit in https://github.com/onnx/onnx/pull/6830
Bump protobuf to v30.1 by @cyyever in https://github.com/onnx/onnx/pull/6804
Remove onnx/onnx-data_pb.h by @cyyever in https://github.com/onnx/onnx/pull/6836
replace quansight-labs/setup-python with actions/setup-python by @ngoldbaum in https://github.com/onnx/onnx/pull/6837
integrate release_mac_freethreading into release_mac by @andife in https://github.com/onnx/onnx/pull/6841
Bump protobuf to v30.2 by @cyyever in https://github.com/onnx/onnx/pull/6839
Improve pyproject.toml and add py.typed by @cyyever in https://github.com/onnx/onnx/pull/6843
Bump ruff to 0.11 and types-protobuf to 5.29.1.20250315 by @cyyever in https://github.com/onnx/onnx/pull/6846
Bump actions/setup-python from 5.4.0 to 5.5.0 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6853
Bump actions/upload-artifact from 4.6.1 to 4.6.2 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6852
Bump actions/download-artifact from 4.1.9 to 4.2.1 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6856
Bump clang-format to 20 by @cyyever in https://github.com/onnx/onnx/pull/6850
Fix external data bug in version converter by @yuanyao-nv in https://github.com/onnx/onnx/pull/6847
Bump github/codeql-action from 3.28.11 to 3.28.13 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6858
Bump editorconfig-checker from 3.2.0 to 3.2.1 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6860
Bump reviewdog/action-misspell from 1.26.1 to 1.26.3 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6857
Bump reviewdog/action-shellcheck from 1.29.0 to 1.30.0 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6854
Added selection option to enable both release and preview builds in the create_release.yml workflow by @andife in https://github.com/onnx/onnx/pull/6851
Add Publishing Workflow for onnx to Test PyPI (https://test.pypi.org/project/onnx/) by @andife in https://github.com/onnx/onnx/pull/6849
Bump reviewdog/action-cpplint from 1.8.0 to 1.9.2 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6855
Remove pyi generators by @yadunand-kamath in https://github.com/onnx/onnx/pull/6863
Update win_no_exception_ci.yml by @andife in https://github.com/onnx/onnx/pull/6872
remove not used condition in preview_source_dist_test.yml by @andife in https://github.com/onnx/onnx/pull/6873
Update OnnxReleases.md by @andife in https://github.com/onnx/onnx/pull/6871
Remove ipython, twine from requirements*.txt by @andife in https://github.com/onnx/onnx/pull/6874
Update release_linux_aarch64.yml by @andife in https://github.com/onnx/onnx/pull/6876
Update and rename release_win.yml to release_win_x86_64.yml by @andife in https://github.com/onnx/onnx/pull/6875
remove jupyter from requirements-dev.txt by @andife in https://github.com/onnx/onnx/pull/6878
Remove outdated comments in clang-tidy config by @cyyever in https://github.com/onnx/onnx/pull/6882
Use std::filesystem to simplify code by @cyyever in https://github.com/onnx/onnx/pull/6402
Add support for Free-Threading in Linux Wheel Builds by @andife in https://github.com/onnx/onnx/pull/6835
Integrate freethreading parts from separate file into main by @andife in https://github.com/onnx/onnx/pull/6889
Update VERSION_NUMBER to 1.19 by @andife in https://github.com/onnx/onnx/pull/6890
Update versioning in the main branch after release branch cut by @andife in https://github.com/onnx/onnx/pull/6892
Link privately to protobuf static libraries by @cyyever in https://github.com/onnx/onnx/pull/6881
Update release_linux_aarch64 to include 3.13t by @andife in https://github.com/onnx/onnx/pull/6893
Remove nbval dependency, replaces #6896 by @xadupre in https://github.com/onnx/onnx/pull/6897
Consolidate Freethreading Requirements into Main Requirements Files for Enhanced Tooling by @cyyever in https://github.com/onnx/onnx/pull/6844
Delete pyproject_pylint.toml by @justinchuby in https://github.com/onnx/onnx/pull/6903
Add native ARM64 Windows Builds by @andife in https://github.com/onnx/onnx/pull/6904
reduce length of names in create_release.yml by @andife in https://github.com/onnx/onnx/pull/6909
better condition and explanations in create_release.yml by @andife in https://github.com/onnx/onnx/pull/6910
Add workflow dispatch option to publish whl to pypi onnx by @andife in https://github.com/onnx/onnx/pull/6819
Update and rename release_win_freethreading.yml to release_win_x64_fr… by @andife in https://github.com/onnx/onnx/pull/6911
Use Native Runner für linux Aarch64 whl (public preview runner available) by @andife in https://github.com/onnx/onnx/pull/6907
Export symbols used by PyTorch by @cyyever in https://github.com/onnx/onnx/pull/6915
Export more symbols used by PyTorch by @cyyever in https://github.com/onnx/onnx/pull/6916
Use Python3::Interpreter instead of Python3_EXECUTABLE by @cyyever in https://github.com/onnx/onnx/pull/6918
Simplify CMake code by @cyyever in https://github.com/onnx/onnx/pull/6927
Define PYBIND11_DETAILED_ERROR_MESSAGES by @justinchuby in https://github.com/onnx/onnx/pull/6929
Bump ruff from 0.11.2 to 0.11.8 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6937
Bump actions/setup-python from 5.5.0 to 5.6.0 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6940
Bump actions/download-artifact from 4.1.9 to 4.3.0 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6939
Bump types-protobuf from 5.29.1.20250315 to 5.29.1.20250403 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6938
Bump github/codeql-action from 3.28.13 to 3.28.16 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6941
Bump codecov/codecov-action from 5.4.0 to 5.4.2 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6944
Bump stefanzweifel/git-auto-commit-action from 5.1.0 to 5.2.0 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6942
Bump ZedThree/clang-tidy-review from 0.20.1 to 0.21.0 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6943
Use requirements-release_build in entrypoint.sh by @andife in https://github.com/onnx/onnx/pull/6945
Replace requirements-release.txt with requirements-release_build.txt by @andife in https://github.com/onnx/onnx/pull/6946
Update OnnxReleases.md (add remove of rc packages at test.pypi) by @andife in https://github.com/onnx/onnx/pull/6948
Bump clang-format from 20.1.0 to 20.1.3 by @dependabot[bot] in https://github.com/onnx/onnx/pull/6936
Fix typos in multiple files by @co63oc in https://github.com/onnx/onnx/pull/6953
Fix typos in multiple files by @co63oc in https://github.com/onnx/onnx/pull/6956
[feat] Introduce source_date_epoch for reproducible builds (wheels, linux) by @andife in https://github.com/onnx/onnx/pull/6947
Add workflow to generate release notes by @ramkrishna2910 in https://github.com/onnx/onnx/pull/6961
Update test_backend_reference.py by @andife in https://github.com/onnx/onnx/pull/6967
Display types on cast node test errors by @emmanuel-ferdman in https://github.com/onnx/onnx/pull/6970
Update protobuf to 6.31.0 by @cyyever in https://github.com/onnx/onnx/pull/6975
Privately link pybind11 by @cyyever in https://github.com/onnx/onnx/pull/6974
Fix CMake EXPORT by @cyyever in https://github.com/onnx/onnx/pull/6978
Extend function inliner to support schema-defined functions (redo) by @gramalingam in https://github.com/onnx/onnx/pull/6976
Update google test to v1.17.0 by @cyyever in https://github.com/onnx/onnx/pull/6977
Add Release Roadmap and deprecation policy to RELEASE-MANAGEMENT.md by @andife in https://github.com/onnx/onnx/pull/6969
Set eol in gitattributes by @cyyever in https://github.com/onnx/onnx/pull/6979
Simplify CMake code and fix some issues by @cyyever in https://github.com/onnx/onnx/pull/6968
Update stale workflow to not close issues that should stay open by @justinchuby in https://github.com/onnx/onnx/pull/6986
Removes one duplicated unit test by @xadupre in https://github.com/onnx/onnx/pull/6989
Use [[maybe_unused]] by @cyyever in https://github.com/onnx/onnx/pull/6988
Fix IR 11 release comment of onnx.in.proto by @take-cheeze in https://github.com/onnx/onnx/pull/7001
Update links to community meetups in README.md by @andife in https://github.com/onnx/onnx/pull/7004
Fix dubious ownership in repository at '/github/workspace' by @andife in https://github.com/onnx/onnx/pull/6949
Formatting: Update create_release.yml by @andife in https://github.com/onnx/onnx/pull/7005
Simplify proto source file generation by @cyyever in https://github.com/onnx/onnx/pull/6992
Fix symbol refinition in unity builds by @cyyever in https://github.com/onnx/onnx/pull/7006
Bump ossf/scorecard-action from 2.4.1 to 2.4.2 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7015
Bump ruff from 0.11.8 to 0.11.12 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7019
Bump mypy from 1.15.0 to 1.16.0 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7016
Bump codecov/codecov-action from 5.4.2 to 5.4.3 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7013
Bump clang-format from 20.1.3 to 20.1.5 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7017
Bump github/codeql-action from 3.28.16 to 3.28.18 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7014
[feat] linux wheels python 3.14-dev by @andife in https://github.com/onnx/onnx/pull/6951
fix broken links to automatic upgrade and downgrade tests in AddNewOp.md by @alx256 in https://github.com/onnx/onnx/pull/7023
[feat] mac wheels python 3.14-dev by @andife in https://github.com/onnx/onnx/pull/7021
Shorten names in create_release/release_linux for better UX in github ui by @andife in https://github.com/onnx/onnx/pull/7027
fix typo in Update RELEASE-MANAGEMENT.md by @andife in https://github.com/onnx/onnx/pull/7029
Update auto_update_doc.yml by @andife in https://github.com/onnx/onnx/pull/7035
Add test of UNITY_BUILD in main.yml by @cyyever in https://github.com/onnx/onnx/pull/7007
use python 3.13.3 (instead of 3.13.4) in release_win_aarch64.yml by @andife in https://github.com/onnx/onnx/pull/7033
python 3.14-dev for release_win_aarch64.yml by @andife in https://github.com/onnx/onnx/pull/7028
Add ml_dtypes as a requirement by @justinchuby in https://github.com/onnx/onnx/pull/7045
Add Pixi development environment by @cbourjau in https://github.com/onnx/onnx/pull/7044
use newest python 3.13 version in release_win_aarch64.yml by @andife in https://github.com/onnx/onnx/pull/7046
Replace requirements-release with requirements-release_build in weekly_modelzoo.yml by @andife in https://github.com/onnx/onnx/pull/7039
Update and rename pixi-build.yml to pixi_build.yml by @andife in https://github.com/onnx/onnx/pull/7047
clean up unnecessary dependencies in entrypoint.sh by @andife in https://github.com/onnx/onnx/pull/7051
Fix extra-semi-stmt warnings by @cyyever in https://github.com/onnx/onnx/pull/6771
remove outdated comment in requirements-dev.txt by @andife in https://github.com/onnx/onnx/pull/7060
fix typo in RELEASE-MANAGEMENT.md by @andife in https://github.com/onnx/onnx/pull/7062
Create copilot-setup-steps.yml by @justinchuby in https://github.com/onnx/onnx/pull/7061
Restore ONNX_VERIFY_PROTO3 by @cyyever in https://github.com/onnx/onnx/pull/7064
weekly_modelzoo.yml (mac -> linux runner) by @andife in https://github.com/onnx/onnx/pull/7069
Cleanup onnx_proto CMake code by @cyyever in https://github.com/onnx/onnx/pull/7065
add fail-fast to release_mac.yml by @andife in https://github.com/onnx/onnx/pull/7077
run pixi_build.yml only weekly by @andife in https://github.com/onnx/onnx/pull/7078
Reduce macos runs in main.yml by @andife in https://github.com/onnx/onnx/pull/7076
Bump prefix-dev/setup-pixi from 0.8.8 to 0.8.10 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7093
Bump mypy from 1.16.0 to 1.16.1 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7097
Bump stefanzweifel/git-auto-commit-action from 5.2.0 to 6.0.1 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7092
Bump github/codeql-action from 3.28.18 to 3.29.2 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7094
Bump ruff from 0.11.12 to 0.12.1 and improve style by @dependabot[bot] in https://github.com/onnx/onnx/pull/7095
Bump clang-format from 20.1.5 to 20.1.7 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7096
Bump protobuf to 6.31.1 by @cyyever in https://github.com/onnx/onnx/pull/7086
Bump types-protobuf from 5.29.1.20250403 to 6.30.2.20250516 by @dependabot[bot] in https://github.com/onnx/onnx/pull/7018
Use specific version for mac os runner by @andife in https://github.com/onnx/onnx/pull/7115
Switch order of steps in release_win_x86_64.yml by @andife in https://github.com/onnx/onnx/pull/7125
add top level permissions (Update pixi_build.yml) by @andife in https://github.com/onnx/onnx/pull/7126
define top level permission (Update copilot-setup-steps.yml) by @andife in https://github.com/onnx/onnx/pull/7127
add python 3.14-dev (release_win_x86_64.yml) by @andife in https://github.com/onnx/onnx/pull/7149
Add documentation for building and publishing whls to pypi (OnnxReleases.md) by @andife in https://github.com/onnx/onnx/pull/7147
no pytest for 3.13t (release_win_x86_64.yml) by @andife in https://github.com/onnx/onnx/pull/7150
Update release.yml module: CI pipelines by @justinchuby in https://github.com/onnx/onnx/pull/7171
Update RELEASE-MANAGEMENT.md by @andife in https://github.com/onnx/onnx/pull/7160
add missing call-win_arm64 (Update create_release.yml) by @andife in https://github.com/onnx/onnx/pull/7173
turn off some tests for 3.13t, 3.14-dev by @andife in https://github.com/onnx/onnx/pull/7162
Make stale bot ignore "contributions welcome" issues by @justinchuby in https://github.com/onnx/onnx/pull/7180
update versions for 1.19 release by @yuanyao-nv in https://github.com/onnx/onnx/pull/7182
Update version to 1.19.0rc1 by @yuanyao-nv in https://github.com/onnx/onnx/pull/7183
fix condition for publishing to release pypi by @andife in https://github.com/onnx/onnx/pull/7200
Cherrypick from main: Add markdown file and diagram for in-place KV cache (#7205) by @yuanyao-nv in https://github.com/onnx/onnx/pull/7210
[1.19] Revert "Use [[maybe_unused]] (#6988)" by @titaiwangms in https://github.com/onnx/onnx/pull/7227
[1.19] Fix unreachable code by @titaiwangms in https://github.com/onnx/onnx/pull/7229
Update version number to 1.19.0rc2 by @yuanyao-nv in https://github.com/onnx/onnx/pull/7236
Cherry-pick Attention fix from main and upgrade version to 1.19.0rc3 by @yuanyao-nv in https://github.com/onnx/onnx/pull/7241
Update version to 1.19.0 for final release by @yuanyao-nv in https://github.com/onnx/onnx/pull/7247

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