Opus 4.5 vs GPT-5.1
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 GPT-5.1 Instant with superior overall performance and features that make it the better choice for most users.
Try Opus 4.5Feature Comparison
Feature
Opus 4.5
GPT-5.1
Ratings
Overall Rating
4.9
4.7
Coding
5.0
4.5
Writing
4.8
4.6
Reasoning
4.9
4.8
Speed
4.2
4.8
Value
4.5
4.6
Pricing
Monthly Price
$20
$20
Free Tier
Input (per 1M tokens)
$5
$2.5
Output (per 1M tokens)
$25
$10
Features
Context Window
200K
128K
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
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 Opus 4.5 if you need:
Professional developers, complex codebases, autonomous agents
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.