OpenAI vs Speechmatics

Assistant for chat, web search, file analysis and image generation, used in the browser and in desktop and mobile apps; developers can build custom in-chat apps for it via the Apps SDK, built on the Model Context Protocol.

OpenAI's agentic web browser. Deprecated on 9 August 2026, with its browser-based agentic capabilities moved into ChatGPT and Codex.

A version of ChatGPT that US government agencies deploy in their own Microsoft Azure commercial or Azure Government cloud, so the agency manages its own security, privacy and compliance.

ChatGPT in the Excel ribbon: builds and edits spreadsheets, formulas and formatting from plain-language requests, answers questions about what is in the workbook, and asks permission before changing it. OpenAI's own page bundles this with a separate ChatGPT for Google Sheets add-in; this record covers the Excel add-in only.

ChatGPT in the PowerPoint ribbon: creates new slides, rewrites and restructures an existing deck, and turns notes, documents or spreadsheets into presentation-ready content while keeping the output editable in PowerPoint.

ChatGPT in a Microsoft Word sidebar: drafts, revises and reorganizes the open document from notes or pasted source text, pulling in context from connected apps like Outlook, SharePoint, Google Workspace and Dropbox.

OpenAI's text-to-video product. The web and app experiences were discontinued on 26 April 2026; the API will be discontinued on 24 September 2026.

Coding agent that reads, edits and runs a codebase from the terminal, an IDE extension and the ChatGPT web app.

OpenAI's cybersecurity offering, bringing together frontier cyber models, Codex Security and partner workflows to find, validate and fix vulnerabilities, with an access-gated Daybreak Red tier for authorised vulnerability research and red teaming.

Enterprise platform for connecting AI agents to systems of record and running them under enterprise identity, access and observability controls.

Hosted API for OpenAI's text, image, audio and embedding models, billed per token.

Speechmatics' automatic speech recognition API transcribes audio into text in 55+ languages in either real-time streaming or batch mode, with speaker diarization, custom dictionary, translation and summarization options.

Generates a short summary of an audio file in the same API call that transcribes it, as paragraphs or bullets. It is a Speech Intelligence feature enabled by adding a config block to a batch Speech to Text job, not a product bought on its own.

Speechmatics' text-to-speech API generates streaming synthetic English speech from text with sub-150ms latency using four named voices (Sarah, Theo, Megan, Jack), aimed at real-time voice agent use.

Translates a transcript into other languages in the same API call that produces it, for files or live audio. It is a feature switched on inside a Speech to Text request rather than a separate product; the docs file it under Speech to Text and return the translations alongside the transcript.

Speechmatics' voice agent offering provides a real-time conversational speech API - including the Flow WebSocket endpoint that chains speech-to-text, an LLM, text-to-speech and function calling - plus a Python Voice SDK for turn detection and speaker management, and integrations with Vapi, LiveKit and Pipecat.

A locally-executing speech-to-text engine for Mac and Windows laptops that runs on about one CPU core plus the device's neural engine or GPU and roughly 800MB of memory, sending no audio over a network and claiming accuracy within 5% of the cloud API.