Grammarly vs GPT-5.2 o1
A detailed comparison to help you choose the right AI tool for your needs.
Our Pick
GPT-5.2 Thinking
GPT-5.2 Thinking edges out Grammarly with superior overall performance and features that make it the better choice for most users.
Try GPT-5.2 o1Feature Comparison
Feature
Grammarly
GPT-5.2 o1
Ratings
Overall Rating
4.6
4.9
Coding
-
4.8
Writing
4.8
4.5
Reasoning
4.0
5.0
Speed
5.0
3.8
Value
4.5
4.0
Pricing
Monthly Price
$12
$200
Free Tier
Input (per 1M tokens)
-
$15
Output (per 1M tokens)
-
$60
Features
Context Window
50K
128K
Vision/Images
Audio
Video
Code Generation
AI Agents
Grammarly
Pros
- Works everywhere (browser, desktop, mobile)
- Excellent grammar and spelling
- Tone detection
- Plagiarism checker
- GrammarlyGO AI assistant
Cons
- Not for creative writing
- Premium features require subscription
- Can be overly corrective
GPT-5.2 Thinking
Pros
- Best reasoning model from OpenAI
- Edges out Gemini 3 and Claude Opus 4.5 on most tests
- Performs at/above human expert level on GDPval
- Excellent for coding, math, and document analysis
- State-of-the-art on SWE-Bench Pro
Cons
- Expensive ($200/mo for Pro subscription)
- Slower than Instant variant
- Requires Pro subscription for full access
- Writing can feel robotic
Choose Grammarly if you need:
Grammar checking, professional emails, academic writing
Choose GPT-5.2 o1 if you need:
Complex reasoning, software engineering, research, math proofs
Ready to get started?
Both tools offer free tiers or trials. Try them out and see which one works best for your workflow.