GPT-5.1 Thinking
OpenAI's advanced reasoning model. Varies thinking time dynamically based on task complexity. Twice as fast on simple tasks, twice as thorough on complex ones.
Pricing
Ratings
Pros
- Best for complex reasoning tasks
- Dynamic thinking time optimization
- Excellent for math and logic
- Great for research and analysis
Cons
- Expensive
- Slower on simple tasks
- Requires Pro subscription
- Writing can feel robotic
Best For
Complex reasoning, math proofs, scientific analysis
Quick Info
- Provider
- OpenAI
- Version
- 5.1
- Released
- Nov 2025
- Context
- 128K tokens
Features
Categories
Compare GPT-5.1 o1 With
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Frequently Asked Questions
Is GPT-5.1 Thinking worth it in 2026?
With a rating of 4.8/5, GPT-5.1 Thinking is best for Complex reasoning, math proofs, scientific analysis. At $200/mo, it's competitive for its feature set.
What are the best alternatives to GPT-5.1 Thinking?
Top alternatives include OpenClaw, Claude Opus 4.5, Claude Sonnet 4.5, and GPT-5.1 Instant. Each has different strengths — use our comparison tool above to see detailed head-to-head matchups.
Does GPT-5.1 Thinking have a free plan?
GPT-5.1 Thinking does not currently offer a free plan. Plans start at $200/mo.