Side-by-side comparison — features, pricing, pros and cons
OpenAI's general-purpose AI assistant now powered by GPT-5.4 with 1M token context and computer-use capability for desktop automation. Supports text, voice, image, file, and code workflows in one interface. Used by 400M+ weekly active users across professional and consumer contexts.
Grammarly is an AI-powered writing assistant that helps you communicate clearly and effectively. Beyond grammar and spelling, it offers tone detection, clarity improvements, and now generative AI features to help draft, rewrite, and enhance your writing across apps.
| Tool | ||
|---|---|---|
| Pricing | Freemium | Freemium |
| Rating | 4.5 | 4.6 |
| Category | AI Assistants | — |
| Description | OpenAI's general-purpose AI assistant now powered by GPT-5.4 with 1M token context and computer-use capability for desktop automation. Supports text, voice, image, file, and code workflows in one interface. Used by 400M+ weekly active users across professional and consumer contexts. | Grammarly is an AI-powered writing assistant that helps you communicate clearly and effectively. Beyond grammar and spelling, it offers tone detection, clarity improvements, and now generative AI features to help draft, rewrite, and enhance your writing across apps. |
| Features | ||
| GPT-5.4 model with 1M token context window | ||
| Computer-use feature for desktop task automation | ||
| Codex App integration for autonomous coding agents | ||
| Voice mode with real-time conversation | ||
| DALL-E image generation built in as GPT Image | ||
| File upload and analysis (PDF, CSV, images, code) | ||
| Custom GPTs marketplace with 3M+ published agents | ||
| Projects feature for persistent context across sessions | ||
| Grammar and spelling check | ||
| Tone detection | ||
| Clarity suggestions | ||
| Generative AI writing | ||
| Plagiarism detection | ||
| Style guides | ||
| Browser and app integrations | ||
| Team analytics | ||
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| Website | Visit | Visit |
