Grammarly vs Opus 4.5
A detailed comparison to help you choose the right AI tool for your needs.
Our Pick
Claude Opus 4.5
Claude Opus 4.5 edges out Grammarly with superior overall performance and features that make it the better choice for most users.
Try Opus 4.5Feature Comparison
Feature
Grammarly
Opus 4.5
Ratings
Overall Rating
4.6
4.9
Coding
-
5.0
Writing
4.8
4.8
Reasoning
4.0
4.9
Speed
5.0
4.2
Value
4.5
4.5
Pricing
Monthly Price
$12
$20
Free Tier
Input (per 1M tokens)
-
$5
Output (per 1M tokens)
-
$25
Features
Context Window
50K
200K
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
Claude Opus 4.5
Pros
- Best coding model available (80.9% SWE-bench)
- Excellent for autonomous agents
- Effort parameter allows speed/quality tradeoff
- 76% fewer tokens than Sonnet at same quality
- Strong at long-horizon tasks
Cons
- More expensive than Sonnet
- Slower on simple tasks
- Requires Claude Pro/Max subscription for full access
Choose Grammarly if you need:
Grammar checking, professional emails, academic writing
Choose Opus 4.5 if you need:
Professional developers, complex codebases, autonomous agents
Ready to get started?
Both tools offer free tiers or trials. Try them out and see which one works best for your workflow.