Opus 4.5 vs CustomGPT
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 CustomGPT with superior overall performance and features that make it the better choice for most users.
Try Opus 4.5Feature Comparison
Feature
Opus 4.5
CustomGPT
Ratings
Overall Rating
4.9
4.4
Coding
5.0
-
Writing
4.8
4.0
Reasoning
4.9
4.0
Speed
4.2
4.5
Value
4.5
4.3
Pricing
Monthly Price
$20
$49
Free Tier
Input (per 1M tokens)
$5
-
Output (per 1M tokens)
$25
-
Features
Context Window
200K
100K
Vision/Images
Audio
Video
Code Generation
AI Agents
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
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 Opus 4.5 if you need:
Professional developers, complex codebases, autonomous agents
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.