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---
name: "transcribe"
description: "Transcribe audio files to text with optional diarization and known-speaker hints. Use when a user asks to transcribe speech from audio/video, extract text from recordings, or label speakers in interviews or meetings."
---
# Audio Transcribe
Transcribe audio using OpenAI, with optional speaker diarization when requested. Prefer the bundled CLI for deterministic, repeatable runs.
## Workflow
1. Collect inputs: audio file path(s), desired response format (text/json/diarized_json), optional language hint, and any known speaker references.
2. Verify `OPENAI_API_KEY` is set. If missing, ask the user to set it locally (do not ask them to paste the key).
3. Run the bundled `transcribe_diarize.py` CLI with sensible defaults (fast text transcription).
4. Validate the output: transcription quality, speaker labels, and segment boundaries; iterate with a single targeted change if needed.
5. Save outputs under `output/transcribe/` when working in this repo.
## Decision rules
- Default to `gpt-4o-mini-transcribe` with `--response-format text` for fast transcription.
- If the user wants speaker labels or diarization, use `--model gpt-4o-transcribe-diarize --response-format diarized_json`.
- If audio is longer than ~30 seconds, keep `--chunking-strategy auto`.
- Prompting is not supported for `gpt-4o-transcribe-diarize`.
## Output conventions
- Use `output/transcribe/<job-id>/` for evaluation runs.
- Use `--out-dir` for multiple files to avoid overwriting.
## Dependencies (install if missing)
Prefer `uv` for dependency management.
```
uv pip install openai
```
If `uv` is unavailable:
```
python3 -m pip install openai
```
## Environment
- `OPENAI_API_KEY` must be set for live API calls.
- If the key is missing, instruct the user to create one in the OpenAI platform UI and export it in their shell.
- Never ask the user to paste the full key in chat.
## Skill path (set once)
```bash
export CODEX_HOME="${CODEX_HOME:-$HOME/.codex}"
export TRANSCRIBE_CLI="$CODEX_HOME/skills/transcribe/scripts/transcribe_diarize.py"
```
User-scoped skills install under `$CODEX_HOME/skills` (default: `~/.codex/skills`).
## CLI quick start
Single file (fast text default):
```
python3 "$TRANSCRIBE_CLI" \
path/to/audio.wav \
--out transcript.txt
```
Diarization with known speakers (up to 4):
```
python3 "$TRANSCRIBE_CLI" \
meeting.m4a \
--model gpt-4o-transcribe-diarize \
--known-speaker "Alice=refs/alice.wav" \
--known-speaker "Bob=refs/bob.wav" \
--response-format diarized_json \
--out-dir output/transcribe/meeting
```
Plain text output (explicit):
```
python3 "$TRANSCRIBE_CLI" \
interview.mp3 \
--response-format text \
--out interview.txt
```
## Reference map
- `references/api.md`: supported formats, limits, response formats, and known-speaker notes.

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interface:
display_name: "Audio Transcribe"
short_description: "Transcribe audio using OpenAI, with optional speaker diarization when requested. Prefer the bundled CLI for deterministic, repeatable runs."
icon_small: "./assets/transcribe-small.svg"
icon_large: "./assets/transcribe.png"
default_prompt: "Transcribe this audio or video, include speaker labels when possible, and provide a clean summary."

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# gpt-4o-transcribe-diarize quick reference
- Input formats: mp3, mp4, mpeg, mpga, m4a, wav, webm.
- Max file size: 25 MB per request.
- response_format options: text, json, diarized_json.
- For audio longer than ~30 seconds, pass chunking_strategy (use "auto" to split into chunks).
- Known speakers: up to 4 references via extra_body known_speaker_names + known_speaker_references (data URLs).
- Prompting is not supported for gpt-4o-transcribe-diarize.

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#!/usr/bin/env python3
"""Transcribe audio (optionally with speaker diarization) using OpenAI."""
from __future__ import annotations
import argparse
import base64
import json
import mimetypes
import os
from pathlib import Path
import sys
from typing import Any, Dict, List, Optional, Tuple
DEFAULT_MODEL = "gpt-4o-mini-transcribe"
DEFAULT_RESPONSE_FORMAT = "text"
DEFAULT_CHUNKING_STRATEGY = "auto"
MAX_AUDIO_BYTES = 25 * 1024 * 1024
MAX_KNOWN_SPEAKERS = 4
ALLOWED_RESPONSE_FORMATS = {"text", "json", "diarized_json"}
def _die(message: str, code: int = 1) -> None:
print(f"Error: {message}", file=sys.stderr)
raise SystemExit(code)
def _warn(message: str) -> None:
print(f"Warning: {message}", file=sys.stderr)
def _ensure_api_key(dry_run: bool) -> None:
if os.getenv("OPENAI_API_KEY"):
print("OPENAI_API_KEY is set.", file=sys.stderr)
return
if dry_run:
_warn("OPENAI_API_KEY is not set; dry-run only.")
return
_die("OPENAI_API_KEY is not set. Export it before running.")
def _normalize_response_format(value: Optional[str]) -> str:
if not value:
return DEFAULT_RESPONSE_FORMAT
fmt = value.strip().lower()
if fmt not in ALLOWED_RESPONSE_FORMATS:
_die(
"response-format must be one of: "
+ ", ".join(sorted(ALLOWED_RESPONSE_FORMATS))
)
return fmt
def _normalize_chunking_strategy(value: Optional[str]) -> Any:
if not value:
return DEFAULT_CHUNKING_STRATEGY
raw = str(value).strip()
if raw.startswith("{"):
try:
return json.loads(raw)
except json.JSONDecodeError:
_die("chunking-strategy JSON is invalid")
return raw
def _guess_mime_type(path: Path) -> str:
mime, _ = mimetypes.guess_type(str(path))
if mime:
return mime
return "audio/wav"
def _encode_data_url(path: Path) -> str:
data = path.read_bytes()
mime = _guess_mime_type(path)
encoded = base64.b64encode(data).decode("ascii")
return f"data:{mime};base64,{encoded}"
def _parse_known_speakers(raw_items: List[str]) -> Tuple[List[str], List[str]]:
names: List[str] = []
refs: List[str] = []
for raw in raw_items:
if "=" not in raw:
_die("known-speaker must be NAME=PATH")
name, path_str = raw.split("=", 1)
name = name.strip()
path = Path(path_str.strip())
if not name or not path_str.strip():
_die("known-speaker must be NAME=PATH")
if not path.exists():
_die(f"Known speaker file not found: {path}")
names.append(name)
refs.append(_encode_data_url(path))
if len(names) > MAX_KNOWN_SPEAKERS:
_die(f"known speakers must be <= {MAX_KNOWN_SPEAKERS}")
return names, refs
def _output_extension(response_format: str) -> str:
return "txt" if response_format == "text" else "json"
def _build_output_path(
audio_path: Path,
response_format: str,
out: Optional[str],
out_dir: Optional[str],
) -> Path:
ext = "." + _output_extension(response_format)
if out:
path = Path(out)
if path.exists() and path.is_dir():
return path / f"{audio_path.stem}.transcript{ext}"
if path.suffix == "":
return path.with_suffix(ext)
return path
if out_dir:
base = Path(out_dir)
base.mkdir(parents=True, exist_ok=True)
return base / f"{audio_path.stem}.transcript{ext}"
return Path(f"{audio_path.stem}.transcript{ext}")
def _create_client():
try:
from openai import OpenAI
except ImportError:
_die("openai SDK not installed. Install with `uv pip install openai`.")
return OpenAI()
def _format_output(result: Any, response_format: str) -> str:
if response_format == "text":
text = getattr(result, "text", None)
return text if isinstance(text, str) else str(result)
if hasattr(result, "model_dump"):
return json.dumps(result.model_dump(), indent=2)
if isinstance(result, (dict, list)):
return json.dumps(result, indent=2)
return json.dumps({"text": getattr(result, "text", str(result))}, indent=2)
def _validate_audio(path: Path) -> None:
if not path.exists():
_die(f"Audio file not found: {path}")
size = path.stat().st_size
if size > MAX_AUDIO_BYTES:
_warn(
f"Audio file exceeds 25MB limit ({size} bytes): {path}"
)
def _build_payload(
args: argparse.Namespace,
known_speaker_names: List[str],
known_speaker_refs: List[str],
) -> Dict[str, Any]:
payload: Dict[str, Any] = {
"model": args.model,
"response_format": args.response_format,
"chunking_strategy": args.chunking_strategy,
}
if args.language:
payload["language"] = args.language
if args.prompt:
payload["prompt"] = args.prompt
if known_speaker_names:
payload["extra_body"] = {
"known_speaker_names": known_speaker_names,
"known_speaker_references": known_speaker_refs,
}
return payload
def _run_one(
client: Any,
audio_path: Path,
payload: Dict[str, Any],
) -> Any:
with audio_path.open("rb") as audio_file:
return client.audio.transcriptions.create(
file=audio_file,
**payload,
)
def main() -> None:
parser = argparse.ArgumentParser(
description="Transcribe audio (optionally with speaker diarization) using OpenAI."
)
parser.add_argument("audio", nargs="+", help="Audio file(s) to transcribe")
parser.add_argument(
"--model",
default=DEFAULT_MODEL,
help=f"Model to use (default: {DEFAULT_MODEL})",
)
parser.add_argument(
"--response-format",
default=DEFAULT_RESPONSE_FORMAT,
help="Response format: text, json, or diarized_json",
)
parser.add_argument(
"--chunking-strategy",
default=DEFAULT_CHUNKING_STRATEGY,
help="Chunking strategy (use 'auto' for long audio)",
)
parser.add_argument("--language", help="Optional language hint (e.g. 'en')")
parser.add_argument("--prompt", help="Optional prompt to guide transcription")
parser.add_argument(
"--known-speaker",
action="append",
default=[],
help="Known speaker reference as NAME=PATH (repeatable, max 4)",
)
parser.add_argument("--out", help="Output file path (single audio only)")
parser.add_argument("--out-dir", help="Output directory for transcripts")
parser.add_argument(
"--stdout",
action="store_true",
help="Write transcript to stdout instead of a file",
)
parser.add_argument(
"--dry-run",
action="store_true",
help="Validate inputs and print payload without calling the API",
)
args = parser.parse_args()
args.response_format = _normalize_response_format(args.response_format)
args.chunking_strategy = _normalize_chunking_strategy(args.chunking_strategy)
if args.out and len(args.audio) > 1:
_die("--out only supports a single audio file")
if args.stdout and (args.out or args.out_dir):
_die("--stdout cannot be combined with --out or --out-dir")
if args.stdout and len(args.audio) > 1:
_die("--stdout only supports a single audio file")
if args.prompt and "transcribe-diarize" in args.model:
_die("prompt is not supported with gpt-4o-transcribe-diarize")
if args.response_format == "diarized_json" and "transcribe-diarize" not in args.model:
_die("diarized_json requires gpt-4o-transcribe-diarize")
_ensure_api_key(args.dry_run)
audio_paths = [Path(p) for p in args.audio]
for path in audio_paths:
_validate_audio(path)
known_names, known_refs = _parse_known_speakers(args.known_speaker)
if known_names and "transcribe-diarize" not in args.model:
_warn("known-speaker references are only supported for gpt-4o-transcribe-diarize")
payload = _build_payload(args, known_names, known_refs)
if args.dry_run:
print(json.dumps(payload, indent=2))
return
client = _create_client()
for path in audio_paths:
result = _run_one(client, path, payload)
output = _format_output(result, args.response_format)
if args.stdout:
print(output)
continue
out_path = _build_output_path(path, args.response_format, args.out, args.out_dir)
out_path.parent.mkdir(parents=True, exist_ok=True)
out_path.write_text(output, encoding="utf-8")
print(f"Wrote {out_path}")
if __name__ == "__main__":
main()