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ChatGPT vs Grammarly AI: Complete Comparison 2026

Choosing between ChatGPT and Grammarly AI? We compare both tools across features, pricing, pros and cons to help you decide which is the better fit in 2026.

ChatGPT9.5

OpenAI · Chatbots & LLMs, Coding, Writing

ChatGPT is OpenAI's flagship conversational AI, powering hundreds of millions of weekly users across web, mobile and API. Built on the GPT-4o and GPT-5 family of models, it handles text, images, voice and code in a single interface. With browsing, data analysis, custom GPTs and a vast plugin ecosystem, it remains the default assistant for most knowledge workers.

Grammarly AI8.3

Grammarly · Writing

Grammarly AI extends the popular writing assistant with generative features for drafting, rewriting and adjusting tone anywhere you type. Its GrammarlyGO and editor work across the web, documents and email with real-time grammar, clarity and style suggestions. Grammarly's strength is ubiquitous, context-aware writing help rather than long-form generation.

Key differences at a glance

  • •ChatGPT scores higher overall (9.5 vs 8.3).
  • •Both start at $20/mo (ChatGPT) and $12/mo (Grammarly AI).
  • •ChatGPT leans on most polished and widely supported ecosystem.
  • •Grammarly AI leans on works everywhere you write.

Side-by-side comparison

FeatureChatGPTOpenAIGrammarly AIGrammarly
Quality score9.5 / 108.3 / 10
Starting price$20/mo$12/mo
Free tierYes — Free tier availableYes — Free tier available
API input price$30 / 1M tokens—
API output price$180 / 1M tokens—
SpeedFastFast
Context window128K tokens—
CategoriesChatbots & LLMs, Coding, WritingWriting
Key features
  • Multimodal text, image and voice input
  • Advanced data analysis (code interpreter)
  • Custom GPTs and GPT Store
  • Web browsing and real-time search
  • Real-time grammar and clarity checks
  • Generative drafting and rewriting
  • Tone and style adjustment
  • Works across apps and browsers
Pros
  • + Most polished and widely supported ecosystem
  • + Excellent general reasoning and coding
  • + Huge third-party integration support
  • + Works everywhere you write
  • + Excellent editing and tone tools
  • + Solid free tier
Cons
  • − Usage caps on the most capable models
  • − Can be verbose and overly cautious
  • − Limited long-form generation
  • − Best features behind paywall

ChatGPT

Choose ChatGPT if you want most polished and widely supported ecosystem and a free tier to start.

Grammarly AI

Choose Grammarly AI if you want works everywhere you write and a free tier to start.

Pricing comparison

ChatGPT
$20/mo
API: $30 in / $180 out per 1M tokens
Grammarly AI
$12/mo
查看即時 API 價格數據 → llmprice.app

The verdict

Overall, ChatGPT edges ahead with a quality score of 9.5 versus 8.3 for Grammarly AI. Choose ChatGPT if you want most polished and widely supported ecosystem. That said, Grammarly AI is the better pick when works everywhere you write matters most — so the right answer depends on your priorities and budget.

Try ChatGPT →Try Grammarly AI →

Frequently asked questions

Q. Which is better, ChatGPT or Grammarly AI?

On our scoring, ChatGPT edges ahead (9.5/10), but the right pick depends on your priorities and budget — see the breakdown above.

Q. Is ChatGPT or Grammarly AI cheaper?

ChatGPT starts at $20/mo and Grammarly AI at $12/mo. Check current rates before committing.

Q. Can I use ChatGPT and Grammarly AI together?

Yes — many teams use more than one AI tool, picking ChatGPT for some tasks and Grammarly AI for others where it's stronger.