Opus 4.5 vs GPT-5.2 o1
A detailed comparison to help you choose the right AI tool for your needs.
Feature Comparison
Feature
Opus 4.5
GPT-5.2 o1
Ratings
Overall Rating
4.9
4.9
Coding
5.0
4.8
Writing
4.8
4.5
Reasoning
4.9
5.0
Speed
4.2
3.8
Value
4.5
4.0
Pricing
Monthly Price
$20
$200
Free Tier
Input (per 1M tokens)
$5
$15
Output (per 1M tokens)
$25
$60
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-5.2 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 Opus 4.5 if you need:
Professional developers, complex codebases, autonomous agents
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.