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Symphony Elixir is built on Erlang/BEAM/OTP and requires Elixir 1.19.x (OTP 28). This guide covers installation using mise for runtime management.
Symphony Elixir is prototype software intended for evaluation only and is presented as-is. We recommend implementing your own hardened version based on SPEC.md.

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Prerequisites

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mise for Runtime Management

We recommend using mise to manage Elixir and Erlang versions. mise ensures you’re running the exact runtime versions Symphony expects. 
curl https://mise.run | sh
mise reads .mise.toml in the repository root to install the correct Elixir and Erlang versions automatically.

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Installation Steps

1

Clone the repository

git clone https://github.com/openai/symphony
cd symphony/elixir
2

Trust and install runtime dependencies

Symphony’s .mise.toml specifies Elixir 1.19.x and OTP 28:
mise trust
mise install
Verify the installation:
mise exec -- elixir --version
The mise exec -- prefix runs commands with the project’s configured Elixir/Erlang versions.
3

Install Elixir dependencies

mise exec -- mix setup
This runs mix deps.get and any other setup tasks defined in the project.
4

Build the executable

Compile Symphony and create the standalone binary:
mise exec -- mix build
This creates ./bin/symphony in the elixir directory.

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Verify Installation

Check that the binary was created: 
ls -lh ./bin/symphony

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Next Steps

Configuration

Learn about all configuration options available in WORKFLOW.md

Workflow File

Deep dive into YAML frontmatter and Liquid templating

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