GPT-5.1 vs GPT-5.2 o1
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 GPT-5.1 Instant with superior overall performance and features that make it the better choice for most users.
Try GPT-5.2 o1Feature Comparison
Feature
GPT-5.1
GPT-5.2 o1
Ratings
Overall Rating
4.7
4.9
Coding
4.5
4.8
Writing
4.6
4.5
Reasoning
4.8
5.0
Speed
4.8
3.8
Value
4.6
4.0
Pricing
Monthly Price
$20
$200
Free Tier
Input (per 1M tokens)
$2.5
$15
Output (per 1M tokens)
$10
$60
Features
Context Window
128K
128K
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
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 GPT-5.1 if you need:
General assistant, math problems, quick coding help
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.