onnx 1.20.0

v1.20.0

on Python PyPI

ONNX v1.20.0 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.

Updated Op list:

Cast, CastLike, Constant, ConstantOfShape, DequantizeLinear, Flatten, Identity, If, Loop, Pad, QuantizeLinear, Reshape, Scan, Shape, Size, Squeeze, Transpose, Unsqueeze

Key Updates:

Breaking Changes and Deprecations

• Update manylinux_2014 -> manylinux_2_28 (#7151)
• Update attention gqa to use repeat interleave within repeat kv (#7274)
• Update required Python version to 3.10 and related fixes (#7220)
• Remove Python 3.9 wheel build (#7217)
• Remove deprecated methods (#7214)

Spec and Operator

• Add 2 bit support to onnx (#7446)
• Remove enforcement to node determinism attribute (#7473)
• Fix handling of empty inputs for the Softmax operator (#7206)
• Fix OneHotEncoder segfault due to missing input shape validation (#7302)
• Fix Attention backend test: correct dimension of Range input (#7300)
• Fix Range input rank in Attention op function definition (#7240)
• Update Reduce op doc for empty axes (#7421)
• Add additional test cases for MatMul operator (#7407)
• Fix ScatterND spec (#7406)
• Add node determinism attribute to operator schemas (#7176)

Reference Implementation

• Fix division for integer dtype in reference implementation (#7203)
• Fix noop_with_empty_axes in Reduce ops (#7394)
• Fix warnings in testing (#7367)
• Throw TypeError for invalid input types (#7366)
• Rename variables in RotaryEmbedding reference for clarity (#7316)
• Reference evaluator: treat empty axes as empty (#7244)
• Clean up reference evaluator tests (#7238)

Utilities and Tools

• Fix IsOnnxStaticRegistrationDisabled() inline function breaking schema registration in external modules (#7409)
• Allow conversion from OpSchema to OpSchemaRegisterOnce (#7390)
• Disable nanobind leak warnings in cpp2py_export (#7334)
• Add additional 19 → 18 conversion supports (#7422)
• Create 19 → 18 type op conversion (#7319)
• Clean up shape inference imports (#7278)

Build, CI and Tests

• Create CPPLINT.cfg (#7198)
• Lift minimum Protobuf version for Python 3.14+ on macOS (#7419)
• Downgrade reuse.yml (#7395)
• Add CMake test (#7387)
• Fix a syntactic error in ONNXConfig.cmake.in (#7385)
• Enable Python 3.14 in main (#7384)
• Update manylinux image in release_linux.yml (#7383)
• Support Ninja builds (#7332)
• Update pixi.lock file (#7331)
• Fix CMake expression for find_package (#7295)
• General CMake fixes (#7291)
• Remove ml_dtypes from requirements-dev.txt (#7290)
• Fix conditional for downloading artifacts in mac workflow (#7413)
• Update release_mac.yml: change 3.14-dev to 3.14 (#7396)
• Update release_mac.yml: skip pytest for 3.14-dev (#7369)
• Add GitHub Actions security analysis with Zizmor (#7363)
• Enable macOS + Python 3.13 test (#7330)
• Fix testsuite failures on s390x (#7309)
• Improve abi3audit checks in release_*.yml (#7293)
• Add abi3audit to release_linux.yml (#7288)
• Update pixi.{toml,lock} and create issues if CI fails (#7280)
• Replace pybind11 with nanobind for Python stable ABI support (#7276)

Documentation

• Add trademark information (README.md) (#7189)
• Update RELEASE-MANAGEMENT.md (#7188)
• Improve conditions in create_release.yml (#7186)
• Improve release documentation (OnnxReleases.md) (#7187)
• Improve OnnxReleases.md (#7202)
• Add install command to OnnxReleases.md (#7204)
• Add markdown file and diagram for in-place KV cache (#7205)
• Bump versions for 1.20.0 (#7436)
• Update IR VERSION 12 published date to August 26, 2025 (#7431)
• Clean up pull request template comments (#7415)
• Simplify upload instructions (#7414)
• Add ONNX versions 1.16.1, 1.16.2, and 1.19.1 (#7411)
• Update versioning information in Versioning.md (#7410)
• Improve documentation formatting (#7408)
• Update transpose documentation (#7405)
• Add copyright and license information to main.cc (#7397)
• Update LAST_RELEASE_VERSION to 1.19.1 (missed in last version) (#7391)
• Explicitly specify the Google Python Style Guide in CONTRIBUTING.md (#7381)
• Update RELEASE-MANAGEMENT.md (#7380)
• Update .editorconfig check to include YAML and Markdown files (#7370)
• Improve markdown files (#7368)
• Update data_location docs to match onnx.in.proto (#7347)
• Add abi3 information to README.md (#7289)
• Update OnnxReleases.md with correct pipeline configs (#7252)
• Update figures and RELEASE-MANAGEMENT.md (#7250)
• Update RELEASE-MANAGEMENT.md (#7239)
• Add reproducible builds section to README.md (#7237)
• Fix release condition in create_release.yml (#7230)
• Update RELEASE-MANAGEMENT.md (#7216)