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Speech-to-text model

GPT-4o Transcribe API

OpenAI most accurate speech-to-text, for noisy audio, accents and mixed languages.

GPT-4o Transcribe is a speech-to-text model from OpenAI, available on OttoPort's OpenAI-compatible API as the model ID gpt-4o-transcribe at $0.000121 / second as of 2026-10-14.

Provider

OpenAI

Price

$0.000121 / second

Model ID

gpt-4o-transcribe

Type

speech-to-text model

DictationVoice inputMeeting notes
Pricing

GPT-4o Transcribe API pricing

What OttoPort bills for GPT-4o Transcribe, and what that works out to per unit. Rates are read from the same catalog the gateway meters against, and were current on 2026-10-14.

Per second$0.000121
5-second clip$0.000605
8-second clip$0.000968
Seconds per $1082,644of generated video

No subscription and no minimum — OttoPort bills prepaid credits against usage. See the full rate card.

Quickstart

Call GPT-4o Transcribe in three lines

Send "model": "gpt-4o-transcribe" to POST https://ottoport.ai/api/v1/audio/transcriptions with an OttoPort key. No OpenAI account, no waitlist, no separate SDK.

curl https://ottoport.ai/api/v1/audio/transcriptions \
  -H "Authorization: Bearer $OTTOPORT_API_KEY" \
  -H "Content-Type: application/json" \
  -d "{
    \"model\": \"gpt-4o-transcribe\",
    \"audio\": \"$(base64 < note.m4a | tr -d '\n')\",
    \"format\": \"m4a\",
    \"duration\": 12
  }"

Before you start

  1. 1. Create a key at /api-keys.
  2. 2. Top up credits — the smallest pack is $25.
  3. 3. Paste the request. It returns on the same request.

Full reference at /docs, or drive it from an agent with the MCP server and CLI.

Reference

Request parameters

The body POST https://ottoport.ai/api/v1/audio/transcriptions accepts for GPT-4o Transcribe.

FieldTypeRequiredNotes
modelstringYesAlways gpt-4o-transcribe for GPT-4o Transcribe.
audiostringYesThe recording, base64 or a base64 `data:` URL. Up to 25 MB decoded.
formatstringYeswebm, m4a, mp4, mp3, wav or ogg. Read from a `data:` URL's type when omitted.
durationnumberYesThe recording's length in seconds, up to 600. Rounded up to a whole second, it is the billed unit.
languagestringNoISO 639-1 code of the spoken language, e.g. `en` or `zh`.
promptstringNoNames, jargon or preceding text, to steer spelling and style.
Comparison

GPT-4o Transcribe direct vs through OttoPort

GPT-4o Transcribe is the same model either way — what changes is how many accounts, keys, and integrations you carry to reach it.

OpenAI directVia OttoPort
Accounts and keysAn OpenAI account, plus one more for every other model you addOne OttoPort account and one key for the whole catalog
Request shapeOpenAI's own SDK and response formatOpenAI-compatible — point baseURL at OttoPort and change the model string
Switching modelsA new integration per providerReplace gpt-4o-transcribe with any other model ID in the catalog
BillingA separate invoice and contract per providerPrepaid credits, no subscription, one usage ledger
Provider outagesYour call failsConfigured backup routes are tried in order on provider failure
01

Send the recording's length as `duration`.

02

Name the language when you know it.

03

Put names and jargon in `prompt`.

FAQ

GPT-4o Transcribe API questions

Cost, keys, and model IDs for GPT-4o Transcribe on OttoPort.

How much does the GPT-4o Transcribe API cost?

On OttoPort, GPT-4o Transcribe costs $0.000121 / second as of 2026-10-14. For scale, 5-second clip: $0.000605. Billing is prepaid usage with no subscription and no minimum, and the current rate is always published at ottoport.ai/pricing.

How do I get a GPT-4o Transcribe API key?

You do not need an OpenAI key. Create an OttoPort account, generate a key at ottoport.ai/api-keys, and send it as "Authorization: Bearer <key>" to POST https://ottoport.ai/api/v1/audio/transcriptions with "model": "gpt-4o-transcribe". The same key reaches every other model in the catalog.

What is the model ID for GPT-4o Transcribe?

The OttoPort model ID for GPT-4o Transcribe is gpt-4o-transcribe. Pass it as the model field on POST https://ottoport.ai/api/v1/audio/transcriptions, or list it programmatically from GET https://ottoport.ai/api/v1/models.

Do I need an OpenAI account to use GPT-4o Transcribe?

No. OttoPort connects to OpenAI on your behalf, so one OttoPort account covers GPT-4o Transcribe and every other model in the catalog — no per-provider contracts, keys, or invoices.

Alternatives

Other speech-to-text models on the same API

Same endpoint, same key — swapping model is a one-string change from gpt-4o-transcribe.

Browse the full catalog — every model with its provider and per-unit price.