GPT-5.2 o1 vs CustomGPT
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 CustomGPT with superior overall performance and features that make it the better choice for most users.
Try GPT-5.2 o1Feature Comparison
Feature
GPT-5.2 o1
CustomGPT
Ratings
Overall Rating
4.9
4.4
Coding
4.8
-
Writing
4.5
4.0
Reasoning
5.0
4.0
Speed
3.8
4.5
Value
4.0
4.3
Pricing
Monthly Price
$200
$49
Free Tier
Input (per 1M tokens)
$15
-
Output (per 1M tokens)
$60
-
Features
Context Window
128K
100K
Vision/Images
Audio
Video
Code Generation
AI Agents
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
CustomGPT
Pros
- No-code chatbot builder
- Train on your own data
- Great for customer service
- Easy to deploy on websites
- MIT case study validation
Cons
- Not for coding tasks
- Limited customization vs building from scratch
- Pricing can add up with usage
Choose GPT-5.2 o1 if you need:
Complex reasoning, software engineering, research, math proofs
Choose CustomGPT if you need:
Business chatbots, customer service, knowledge bases
Ready to get started?
Both tools offer free tiers or trials. Try them out and see which one works best for your workflow.