OpenAI

OpenAI’s API is really two APIs behind one brand: the project plane your sk-proj- key talks to, and the organization plane under /v1/organization/* that only an admin key can reach. This plugin covers both, and tells you which half you are missing when you have only supplied one key.

What you can manage

• Models — every model this key can call, base and fine-tuned, each with a Speech support panel saying whether it can synthesize, transcribe, or neither. Fine-tuned snapshots can be deleted; base models cannot.
• Fine-tuning jobs — create a run from a training file and a base model, then pause, resume or cancel it while it is going.
• Batches — create a batch from an uploaded JSONL file, watch the request counters, cancel it. Batches are never deletable.
• Files — fine-tuning datasets, batch inputs and outputs, and file-search sources (delete).
• Vector stores — the chunked-and-embedded collections behind the file_search tool (create, rename, delete).
• Containers — the sandboxes Code Interpreter runs inside (create, delete). They expire on their own idle timer and bill per session.
• Evals — evaluation definitions with their data source and graders (rename, delete).
• Projects — the billing and rate-limit boundary (create, rename, archive). Admin key only.
• Project API keys — listed and revoked, never created. Admin key only.
• Organization members — role changes between owner and reader, and removal. Admin key only.
• Invites — send and revoke. Admin key only.

Credentials

OpenAI needs two keys to cover its whole surface, and they are not interchangeable — each returns 403 on the other’s endpoints.

API Key (required) — platform.openai.com/api-keys. A project key starting sk- or sk-proj-. This drives models, fine-tuning, batches, files, vector stores, containers, evals and the entire Speech tab.

Admin API Key (optional) — Settings → Organization → Admin keys. Starts sk-admin-, and only an organization owner can mint one. It unlocks:

• Projects, project API keys, organization members and invites — without it these four lists are unavailable rather than broken,
• the usage charts on models and projects,
• cost collection, which is otherwise disabled with a message saying why.

The Speech tab

Every model gets a Speech tab, with both halves driven by one shared model picker. See Speech testing for how the panel works generally.

• Synthesize posts to /v1/audio/speech and returns mp3. Ten voices are offered — Alloy, Ash, Ballad, Coral, Echo, Sage, Shimmer, Verse, Marin and Cedar — which is exactly the current VoiceIdsShared enum. fable, onyx and nova still resolve for old integrations but are no longer in the schema, so they are not listed.
• Transcribe posts to /v1/audio/transcriptions, with gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-transcribe, whisper-1 and gpt-4o-transcribe-diarize available.

If you open a model that cannot do audio at all and hit Synthesize, the plugin falls back to gpt-4o-mini-tts rather than sending a request OpenAI will reject; the same happens in reverse for transcription.

Costs and metrics

With an admin key attached, spend comes from GET /v1/organization/costs, bucketed by day and grouped by line item, with the project id carried alongside as a tag. Up to a year of history is available, and the most recent three days are re-fetched on each sync because OpenAI restates them.

Models and projects each get a Metrics tab charting token usage from GET /v1/organization/usage/completions.

Tips & limits

• Synthesis is capped at 4,096 characters per request — the API’s own input limit — and transcription uploads are capped at 25 MB.
• Word timings only come from whisper-1. Timestamps require verbose_json, and the gpt-4o transcribe family only speaks json, text, srt and vtt. Ask any of them for verbose_json and you get a 400, so the word table appears for whisper-1 and for the diarize model’s segments, and nowhere else.
• Speaker labels only come from gpt-4o-transcribe-diarize.
• The legacy tts-1 and tts-1-hd models reject the tone-instructions box. Sending instructions to them is a 400 rather than being ignored, so the plugin drops it for those two.
• The default TTS model is snapshot-pinned (gpt-4o-mini-tts-2025-12-15) so the same text does not quietly start sounding different between two runs.
• Project API keys cannot be created through the API. Only service-account keys can — use the project’s Get credentials action, which creates a service account in the project and hands you its key. A user-owned project key has to be made in the OpenAI dashboard.
• Projects are archived, never deleted. Archived projects still appear in usage and cost reports, which is exactly why they stay visible here.
• The cost and usage endpoints page differently from everything else. They ignore the after cursor the rest of the API uses and accept 1-day buckets only, 180 at a time.