Compare model

TTS

OpenAIGPT-4o Mini TTSDeprecated

Generate natural speech with controls for delivery, tone, and pacing.

Deprecated by the provider. Shuts down on January 6, 2027. Source
gpt-4o-mini-tts

Best for: Turning text into natural-sounding speech

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Catalog status

Enabled

Research checked

2026-10-06

Benchmark results

No recorded results

Results are source-attributed, not TokenRex measurements. Different tests and thinking variants are not interchangeable.

Published benchmark coverage

Reviewed sources do not include results for this exact version. Provider specifications and API capabilities remain listed separately.

Model specifications

Input and output modalities

Provider-reported formats; API compatibility is detailed below.

Input

Text

Output

Audio
Exact model ID
gpt-4o-mini-tts
Model type
TTS

Exact token limits are not published in the reviewed sources, so no estimated limits are shown.

Versions and thinking levels

One enabled version is currently listed for this model.

GPT-4o Mini TTSSelected$0.015 per 1k chars

Features and tool support

TokenRex’s exposed interface, not every feature advertised by the provider. “Available” describes the implemented interface, not a successful test of every input or tool.

Input through TokenRex

Available

Text up to 8,000 characters per call on POST /v1/audio/speech, with a voice name.

Output through TokenRex

Available

MP3 audio file, or live audio chunks with "stream_format": "sse" on OpenAI models (tested).

Function tools

Not exposed

Speech endpoint only — it reads text aloud and does not run tools.

Sources and verification

Provider specifications describe the upstream model, not a guarantee of every feature through TokenRex. Prices come from the enabled catalog; benchmark results belong to the exact tested model.