GPT-5.1 vs Opus 4.5
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
GPT-5.1
Opus 4.5
Ratings
Overall Rating
4.7
4.9
Coding
4.5
5.0
Writing
4.6
4.8
Reasoning
4.8
4.9
Speed
4.8
4.2
Value
4.6
4.5
Pricing
Monthly Price
$20
$20
Free Tier
Input (per 1M tokens)
$2.5
$5
Output (per 1M tokens)
$10
$25
Features
Context Window
128K
200K
Vision/Images
Audio
Video
Code Generation
AI Agents
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
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
Choose GPT-5.1 if you need:
General assistant, math problems, quick coding help
Choose Opus 4.5 if you need:
Professional developers, complex codebases, autonomous agents
Ready to get started?
Both tools offer free tiers or trials. Try them out and see which one works best for your workflow.