Open Router Audio Transcription

An MCP server that transcribes audio files using OpenRouter's audio-capable language models.

Features

• Verbatim transcription — exact word-for-word output including filler words, false starts, and repetitions
• Cleaned transcription — lightly edited for readability: removes fillers, adds punctuation, sentence boundaries, and paragraph breaks; omits content not intended for transcription
• Custom prompt transcription — direct the transcription with your own prompt for specialized use cases

Supported Models

Model	Provider
google/gemini-3-flash-preview (default standard)	Google
google/gemini-3.1-flash-lite-preview (default budget)	Google
xiaomi/mimo-v2-omni	Xiaomi
openai/gpt-audio	OpenAI
openai/gpt-audio-mini (budget)	OpenAI
mistralai/voxtral-small-24b-2507	Mistral
openai/gpt-4o-audio-preview	OpenAI

Supported Audio Formats

mp3, wav, ogg, flac, m4a, aac, webm, wma, opus

Setup

1. Get an OpenRouter API key

Sign up at openrouter.ai and create an API key at openrouter.ai/keys.

2. Add to Claude Code

Run the following command to add the MCP server to Claude Code:

claude mcp add audio-transcription -e OPENROUTER_API_KEY=your-api-key-here -- npx -y or-audio-transcription-mcp

Or add it manually to your Claude Code MCP settings (~/.claude/settings.json or project .mcp.json):

{
  "mcpServers": {
    "audio-transcription": {
      "command": "npx",
      "args": ["-y", "or-audio-transcription-mcp"],
      "env": {
        "OPENROUTER_API_KEY": "your-api-key-here"
      }
    }
  }
}

Alternative: Install from source

git clone https://github.com/danielrosehill/OR-Audio-Transcription-MCP.git
cd OR-Audio-Transcription-MCP
npm install
npm run build

Then configure with a direct path:

claude mcp add audio-transcription -e OPENROUTER_API_KEY=your-api-key-here -- node /path/to/OR-Audio-Transcription-MCP/dist/index.js

Tools

transcribe_audio

Transcribe an audio file.

Parameter	Type	Required	Description
file_path	string	Yes	Absolute path to the audio file
mode	"verbatim" | "cleaned" | "custom"	Yes	Transcription mode
custom_prompt	string	When mode=custom	Custom prompt to direct the transcription
model	string	No	OpenRouter model ID (defaults to google/gemini-3-flash-preview)
budget	boolean	No	Use budget model (google/gemini-3.1-flash-lite-preview). Ignored if model is set

list_transcription_models

Lists all available audio transcription models.

License

MIT