Sonnet 4.5 vs GPT-5.1
A detailed comparison to help you choose the right AI tool for your needs.
Our Pick
Claude Sonnet 4.5
Claude Sonnet 4.5 edges out GPT-5.1 Instant with superior overall performance and features that make it the better choice for most users.
Try Sonnet 4.5Feature Comparison
Feature
Sonnet 4.5
GPT-5.1
Ratings
Overall Rating
4.8
4.7
Coding
4.7
4.5
Writing
4.9
4.6
Reasoning
4.7
4.8
Speed
4.6
4.8
Value
4.9
4.6
Pricing
Monthly Price
$20
$20
Free Tier
Input (per 1M tokens)
$3
$2.5
Output (per 1M tokens)
$15
$10
Features
Context Window
200K
128K
Vision/Images
Audio
Video
Code Generation
AI Agents
Claude Sonnet 4.5
Pros
- Best value for money
- Excellent writing quality
- Fast response times
- Strong coding abilities
- Free tier available
Cons
- Not as powerful as Opus for complex tasks
- Usage limits on free tier
GPT-5.1 Instant
Pros
- Fast responses with adaptive reasoning
- New personalization presets
- Strong math and coding improvements
- Multimodal (text, image, audio)
- Free tier available
Cons
- Coding not as strong as Claude Opus
- Can be verbose
- Writing style less natural than Claude
Choose Sonnet 4.5 if you need:
Daily coding tasks, writing, general use
Choose GPT-5.1 if you need:
General assistant, math problems, quick coding help
Ready to get started?
Both tools offer free tiers or trials. Try them out and see which one works best for your workflow.