baml-bridge
BAML python bindings (new system, bex_engine)
Decision gist · record as of 2026-08-14
Yes, if you are using BAML-generated Python code—it is the required runtime layer. Install directly only if you are authoring BAML runtime extensions or running bridge tests; otherwise, it will be pulled in automatically by your generated SDK. No known vulnerabilities; active maintenance and permissive license.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later; protobuf >= 6.31.1 must be installed.
- Medium install friction due to compiled wheels across multiple platforms (macOS, Linux, Windows, ARM/x86).
- Released 2 days ago with active maintenance status.
License · maintenance · safety
Apache-2.0 (permissive) — Apache-2.0 permissive license allows commercial and private use with minimal restrictions; suitable for most projects.
last release 2026-08-12 (2 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 87,864 downloads/mo, #13,764 on PyPI
Alternatives
Verify before relying
from baml_bridge import BamlRuntime
rt = BamlRuntime.initialize_runtime(
root_path=".",
files={"main.baml": baml_source},
sdk_root="my_sdk",
)- Whether direct use outside of generated BAML SDK code is documented or supported.
- Performance characteristics and memory footprint of the BamlRuntime singleton.
- Compatibility guarantees between baml_bridge versions and generated SDK versions.
What it is and what it does
baml_bridge is the runtime layer that powers BAML SDK packages generated by the baml-cli tool. It provides the core BamlRuntime singleton that manages BAML program execution, handles protobuf serialization and deserialization, and exposes observability primitives (Collector and BamlCtxManager) for monitoring and debugging. The package wraps the bex_engine backend and is designed primarily as an indirect dependency—generated BAML SDK code imports it automatically at runtime.
The package is built as compiled wheels for multiple platforms and Python versions (3.10–3.13, CPython). While it can be used directly for runtime authoring and testing, most users will encounter it as a transitive dependency of their generated BAML SDK. It requires protobuf >= 6.31.1 and Python 3.10+.
Use it for
- Running BAML programs generated by baml-cli generate --target python without manually managing the runtime.
- Authoring custom BAML runtime extensions or bridge implementations.
- Testing BAML SDK packages that depend on baml_bridge for initialization and execution.
- Monitoring BAML program execution via the Collector and BamlCtxManager observability APIs.
- Integrating BAML-generated code into Python applications that need structured LLM interactions.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are using BAML-generated Python code—it is the required runtime layer.
Install directly only if you are authoring BAML runtime extensions or running bridge tests; otherwise, it will be pulled in automatically by your generated SDK. No known vulnerabilities; active maintenance and permissive license.
Install
baml-bridge on PyPI
Before you install
Medium install friction due to compiled wheels across multiple platforms (macOS, Linux, Windows, ARM/x86). Released 2 days ago with active maintenance status. Requires Python 3.10+.
Requires Python 3.10 or later; protobuf >= 6.31.1 must be installed.
License in practice
Apache-2.0 permissive license allows commercial and private use with minimal restrictions; suitable for most projects.
Quickstart
from baml_bridge import BamlRuntime
rt = BamlRuntime.initialize_runtime(
root_path=".",
files={"main.baml": baml_source},
sdk_root="my_sdk",
)Verify before relying
- Whether direct use outside of generated BAML SDK code is documented or supported.
- Performance characteristics and memory footprint of the BamlRuntime singleton.
- Compatibility guarantees between baml_bridge versions and generated SDK versions.
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | 2 packagesprotobuftyping-extensions |
| Maintenance | Actively maintained 2 days since the last release |
| First released | |
| Downloads | 87,864 / month, #13,764 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: Apache Software LicenseOperating System :: MacOSOperating System :: Microsoft :: WindowsOperating System :: POSIX :: LinuxProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: Implementation :: CPythonTopic :: Software Development :: Libraries :: Python Modules |
Evidence: baml_bridge-0.16.0-cp310-abi3-macosx_10_12_x86_64.whl; baml_bridge-0.16.0-cp310-abi3-macosx_11_0_arm64.whl; baml_bridge-0.16.0-cp310-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; baml_bridge-0.16.0-cp310-abi3-manylinux_2_24_aarch64.whl; baml_bridge-0.16.0-cp310-abi3-musllinux_1_1_aarch64.whl; baml_bridge-0.16.0-cp310-abi3-musllinux_1_1_x86_64.whl; baml_bridge-0.16.0-cp310-abi3-win_amd64.whl; baml_bridge-0.16.0-cp310-abi3-win_arm64.whl
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See also baml-py · protobuf-py-ext · protobuf-py · bbpb · opentelemetry-exporter-otlp-proto-http · databento-dbn · protobuf-decoder · opentelemetry-exporter-otlp-proto-grpc · brotlipy · smg-grpc-proto