Grammarly
Grammar, tone and generative rewriting across browser, desktop and mobile.
Full Grammarly record →Head to head
Grammarly vs ChatGPT
Grammarly (Grammarly) and ChatGPT (OpenAI) both sit in Writing. ChatGPT is the cheaper entry point at Pricing not published in the provided documentation. ChatGPT shipped more tracked changes in the last 30 days (12 vs 2). Every value below comes from the latest crawl of the vendors' own pages.
| Attribute | Grammarly Grammarly | ChatGPT OpenAI |
|---|---|---|
| Segment | Writing | Writing |
| Version | Pro | GPT-6 Astra |
| Entry cost | Free tier · from $12/mo | Pricing not published in the provided documentation |
| Pricing tiers | Free free · Pro $12 · Enterprise free | Free Tier free |
| Model stack | Grammarly AI · Grammarly AI Assistant · Grammarly ML · Grammarly Proprietary AI · In-house NLP models · Undisclosed frontier LLM | GPT Image · GPT-5.2 · GPT-5.2 Thinking · GPT-5.4 · gpt-5.6 · gpt-6-astra |
| Context window | Not published | 196K tokens on Plus |
| Public API | ||
| Routes models | ||
| Changes / 30d | 2 | 12 |
| Origin | Global | Global |
| Capabilities | Grammar and tone, Generative rewriting, Plagiarism detection, AI detection, Docs editor, Grammar Checker, Plagiarism Checker, AI Detector | Voice mode, Deep research, Canvas, Agent mode, Projects, Connectors, Realtime API, Voice agents |
ChatGPT
The most widely used consumer AI assistant, spanning writing, analysis, images and voice.
Full ChatGPT record →