TTS-1 HD is OpenAI's high-definition text-to-speech model. It produces natural-sounding speech from text input with higher audio quality than the standard TTS-1 model.

How does TTS-1 HD compare to ElevenLabs?

TTS-1 HD uses built-in OpenAI voices and is straightforward to set up. ElevenLabs (Eleven v3) offers voice cloning, broader multilingual support, and more granular voice control. Both are available on the same Audio node in PlugNode.

Can I use TTS-1 HD for video voiceover?

Yes. Wire a Text node into an Audio node (TTS-1 HD), then combine the audio output with a Video node downstream. The flow generates both video and voiceover in one run.

Does PlugNode charge extra for TTS-1 HD?

No. You pay OpenAI directly with your own key. PlugNode does not mark up model costs.

What voices are available?

TTS-1 HD offers multiple built-in voices through the OpenAI API. Select the voice from the Audio node configuration panel. Check OpenAI documentation for the current voice list.

OpenAI · Speech synthesis

TTS-1 HD

OpenAI TTS-1 HD on a visual canvas. Convert text to speech, wire into media pipelines, publish the flow as a signed endpoint.

At a glance

TTS-1 HD is OpenAI's high-definition text-to-speech model with natural-sounding voices.
Produces studio-quality speech from text input with multiple voice options.
Available on PlugNode as an option on the Audio node. BYO OpenAI API key, no markup.
Chain with GPT-4.1 to generate narration from scripts in a single flow.

What it is

TTS-1 HD is OpenAI's high-definition text-to-speech model. It converts text input into natural-sounding speech audio, with a selection of built-in voices. The HD variant produces higher-quality audio compared to the standard TTS-1 model, with better clarity and more natural prosody. On PlugNode, TTS-1 HD is available on the Audio node. Select it from the model dropdown, choose a voice, pass text input, and the node returns an audio file. It pairs naturally with GPT-4.1 on the Text node: generate a script, then convert it to speech in the same flow. For multilingual or voice-cloned speech, the ElevenLabs models on the same Audio node offer broader language support and custom voice options.

What you can do with it

Convert text to natural-sounding speech audio
Select from multiple built-in voice options
Produce HD-quality audio with clear prosody
Chain with GPT-4.1 for scripted narration pipelines
Pair with Video nodes for voiceover on generated footage
Wire into HTTP Trigger and Respond to Webhook for a TTS API

When to use TTS-1 HD

TTS-1 HD is the right pick when you need clean, natural English speech from a known set of voices without additional setup. It produces consistent output across runs, which matters for branded content where the voice should not shift between batches.

Common patterns on PlugNode: a Text node writes narration from a brief, then Audio (TTS-1 HD) converts it to speech. Add a Video node and you have a full explainer pipeline. The flow runs the same whether you trigger it from the canvas or via HTTP Trigger from your app.

TTS-1 HD vs ElevenLabs

Both providers are available on the same Audio node. TTS-1 HD is simpler: pick a built-in voice and go. ElevenLabs (Eleven v3) adds voice cloning, 30+ languages, and finer control over delivery style. If your flow needs a custom brand voice or multilingual output, ElevenLabs is the stronger option. If you need reliable English narration with minimal configuration, TTS-1 HD works out of the box.

Run it on PlugNode

TTS-1 HD is available on PlugNode's Audio node. Select it from the model dropdown, paste your OpenAI API key in Settings, choose a voice, and pass text input. No credit system, no markup. Wire it after a Text node to build script-to-speech flows, or add HTTP Trigger to expose the pipeline as an API.

You pay OpenAI directly at their published API rates. PlugNode does not add a per-character markup or a credit layer. Check OpenAI pricing page for current rates.

Frequently asked questions

What is TTS-1 HD?: TTS-1 HD is OpenAI's high-definition text-to-speech model. It produces natural-sounding speech from text input with higher audio quality than the standard TTS-1 model.
How does TTS-1 HD compare to ElevenLabs?: TTS-1 HD uses built-in OpenAI voices and is straightforward to set up. ElevenLabs (Eleven v3) offers voice cloning, broader multilingual support, and more granular voice control. Both are available on the same Audio node in PlugNode.
Can I use TTS-1 HD for video voiceover?: Yes. Wire a Text node into an Audio node (TTS-1 HD), then combine the audio output with a Video node downstream. The flow generates both video and voiceover in one run.
Does PlugNode charge extra for TTS-1 HD?: No. You pay OpenAI directly with your own key. PlugNode does not mark up model costs.
What voices are available?: TTS-1 HD offers multiple built-in voices through the OpenAI API. Select the voice from the Audio node configuration panel. Check OpenAI documentation for the current voice list.

Related models

All models

OpenAI · Text generationGPT-4.1OpenAI GPT-4.1 on a visual canvas. Generate text, chain it into media pipelines, publish the whole flow as a signed endpoint.

ElevenLabs · Speech synthesisEleven v3ElevenLabs Eleven v3 on a visual canvas. Clone voices, generate multilingual speech, wire into pipelines, publish as a signed endpoint.

Google · Video generationVeo 3.1Google Veo 3.1 on a visual canvas. Generate 4K video with audio, wire it into a pipeline, publish the whole flow as a signed endpoint.

Last updated 2026-04-28

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