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ONNX Runtime v1.21

Announcements

• No large announcements of note this release! We've made a lot of small refinements to streamline your ONNX Runtime experience.

GenAI & Advanced Model Features

Enhanced Decoding & Pipeline Support

• Added "chat mode" support for CPU, GPU, and WebGPU.
• Provided support for decoder model pipelines.
• Added support for Java API for MultiLoRA.

API & Compatibility Updates

• Chat mode introduced breaking changes in the API (see migration guide).

Bug Fixes for Model Output

• Fixed Phi series garbage output issues with long prompts.
• Resolved gibberish issues with top_k on CPU.

Execution & Core Optimizations

Core Refinements

• Reduced default logger usage for improved efficiency(#23030).
• Fixed a visibility issue in theadpool (#23098).

Execution Provider (EP) Updates

General

• Removed TVM EP from the source tree(#22827).
• Marked NNAPI EP for deprecation (following Google's deprecation of NNAPI).
• Fixed a DLL delay loading issue that impacts WebGPU EP and DirectML EP's usability on Windows (#23111, #23227)

TensorRT EP Improvements

• Added support for TensorRT 10.8.
• Assigned DDS ops (NMS, RoiAlign, NonZero) to TensorRT by default.
• Introduced option trt_op_types_to_exclude to exclude specific ops from TensorRT assignment.

QNN EP Improvements

• Introduced QNN shared memory support.
• Improved performance for AI Hub models.
• Added support for QAIRT/QNN SDK 2.31.
• Added Python 3.13 package.
• Miscellaneous bug fixes and enhancements.
• QNN EP is now built as a shared library/DLL by default. To retain previous build behavior, use build option --use_qnn static_lib.

DirectML EP Support & Upgrades

• Updated DirectML version from 1.15.2 to 1.15.4(#22635).

OpenVINO EP Improvements

• Introduced OpenVINO EP Weights Sharing feature.
• Added support for various contrib Ops in OVEP:
  • SkipLayerNormalization, MatMulNBits, FusedGemm, FusedConv, EmbedLayerNormalization, BiasGelu, Attention, DynamicQuantizeMatMul, FusedMatMul, QuickGelu, SkipSimplifiedLayerNormalization

... (truncated)

• e0b66ca Round 2 of cherry-picks into rel-1.21.0 (#23899)
• beb1a92 Cherry-picks into rel-1.21.0 (#23846)
• 98511b0 Set build user's uid when creating Migraphx/ROCM docker images (#23657)
• 23f787e [TensorRT EP] Add new provider option to exclude ops from running on TRT (#23...
• 1b0a2ba Update cmake_cuda_architecture to control package size (#23671)
• 8eb5513 [webgpu] Implement SubGroupMatrix based MatMulNBits for Metal (#23729)
• d82604e [Optimizer] Fix exception for Q -> DQ sequence with different scale types (#2...
• 754ee21 OVEP: Bug Fixes, Refactoring, and Contrib Ops Update (#23742)
• 6715d4c Shape inference: GatherBlockQuantized dispatcher (#23748)
• 75cf166 [QNN EP] Passthrough EP Parameters in Node (#23468)
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