Sonnet 4.5 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 Claude Sonnet 4.5 with superior overall performance and features that make it the better choice for most users.
Try GPT-5.2 o1Feature Comparison
Feature
Sonnet 4.5
GPT-5.2 o1
Ratings
Overall Rating
4.8
4.9
Coding
4.7
4.8
Writing
4.9
4.5
Reasoning
4.7
5.0
Speed
4.6
3.8
Value
4.9
4.0
Pricing
Monthly Price
$20
$200
Free Tier
Input (per 1M tokens)
$3
$15
Output (per 1M tokens)
$15
$60
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-5.2 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 Sonnet 4.5 if you need:
Daily coding tasks, writing, general use
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.