Transcription model

Universal 3.5 Pro

assemblyai/universal-3-5-pro

assemblyai/universal-3-5-pro is a speech-to-text model from Assemblyai you can call on the OceanToken API.

Price card, similar models and questions answered: Universal 3.5 Pro on oceantoken.ai.

At a glance

API

POST /v1/audio/transcriptions, multipart/form-data. Base URL https://api.oceantoken.ai, your OceanToken key as the bearer token. The OpenAI SDKs work unchanged; see the Quickstart.

Download this spec (JSON) · llms.txt for AI assistants

Transcribe a file

curl https://api.oceantoken.ai/v1/audio/transcriptions \
  -H "Authorization: Bearer $OCEANTOKEN_API_KEY" \
  -F model="assemblyai/universal-3-5-pro" -F file=@meeting.mp3

import os
from openai import OpenAI

client = OpenAI(base_url="https://api.oceantoken.ai/v1", api_key=os.environ["OCEANTOKEN_API_KEY"])
with open("meeting.mp3", "rb") as f:
    result = client.audio.transcriptions.create(model="assemblyai/universal-3-5-pro", file=f)
print(result.text)

import fs from 'node:fs';
import OpenAI from 'openai';

const client = new OpenAI({baseURL: 'https://api.oceantoken.ai/v1', apiKey: process.env.OCEANTOKEN_API_KEY});
const result = await client.audio.transcriptions.create({model: 'assemblyai/universal-3-5-pro', file: fs.createReadStream('meeting.mp3')});
console.log(result.text);

Request parameters

Only what this model takes. Anything else in the request is left out before it reaches the model.

Response

{
  "text": "Hello and welcome."
}

More examples and how errors and billing work: Speech and transcription.

Compared with similar models

Transcription models on OceanToken in the same price range as assemblyai/universal-3-5-pro. Compare their prices on oceantoken.ai.

Use it

Create an account Price on oceantoken.ai

The facts on this page were read from the live OceanToken catalog on 2026-11-05 (UTC), when the documentation was built. Prices are published on oceantoken.ai.