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What is Grok Speech to Text (STT)?

Grok Speech to Text is a standalone audio API designed to help developers effortlessly integrate rapid and accurate transcription features into a wide range of applications. Leveraging the same technological foundation that powers Grok Voice, Tesla's automotive systems, and Starlink's customer support, this API serves numerous purposes, including voice assistants, real-time transcription services, accessibility improvements, podcast creation, meeting records, telecommunication, and engaging audio interactions. Grok STT can generate transcripts from lengthy audio files via a REST API or provide instantaneous speech transcription through a low-latency WebSocket API. It includes features such as word-level timestamps, speaker identification, support for multiple audio streams, and sophisticated Inverse Text Normalization, which converts spoken words into properly formatted structured outputs for various data types, such as numbers, dates, and currencies. Thoroughly evaluated across diverse formats like phone calls, meetings, videos, and podcasts, Grok Speech to Text showcases remarkable accuracy in entity recognition and various business applications. This API stands out as a flexible tool for developers aiming to enrich their applications with dependable transcription functionalities, making it an invaluable resource in the realm of audio data processing.

What is GPT-Realtime-2.1?

GPT-Realtime-2.1 is an OpenAI realtime reasoning model for developers building voice agents, conversational AI assistants, and speech-to-speech applications. The model is designed to support fast interactive experiences where users can speak naturally and receive audio or text responses. GPT-Realtime-2.1 updates GPT-Realtime-2 with improved handling of alphanumeric recognition, silence, background noise, and interruptions. It supports text, audio, and image input, with text and audio output, while video is not supported. The model includes configurable reasoning effort so developers can balance reasoning depth, latency, and token usage for different voice-agent workflows. GPT-Realtime-2.1 also supports instruction following, function calling, tool use, and reasoning tokens for more complex applications. Its 128,000-token context window and 32,000-token maximum output allow it to manage longer conversations and richer task context. OpenAI lists support across endpoints such as Chat Completions, Responses, Realtime, realtime translations, realtime transcription sessions, Assistants, Batch, and related API services. The model’s documented pricing includes $4 per 1 million text input tokens, $0.40 per 1 million cached text input tokens, and $24 per 1 million text output tokens, with separate audio and image token pricing. GPT-Realtime-2.1 is not documented as supporting streaming, structured outputs, fine-tuning, or predicted outputs. By combining realtime speech, multimodal input, reasoning, function calling, and tool use, GPT-Realtime-2.1 gives developers a foundation for building sophisticated AI voice agents and interactive customer-facing applications.

Media

Media

Integrations Supported

Grok
OpenAI
gpt-realtime

Integrations Supported

Grok
OpenAI
gpt-realtime

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Pricing Information

$0.40 per cached input
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

SpaceXAI

Date Founded

2023

Company Location

United States

Company Website

x.ai/news/grok-stt-and-tts-apis

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

developers.openai.com/api/docs/models/gpt-realtime-2.1

Categories and Features

Categories and Features

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