Model Comparison
GPT-5.6 Sol vs o1-proWhich is better in 2026?
GPT-5.6 Sol significantly outperforms across most benchmarks.
Verdict: GPT-5.6 Sol vs o1-pro — which is better?
GPT-5.6 Sol (by OpenAI) and o1-pro (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
GPT-5.6 Sol outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks. GPT-5.6 Sol significantly outperforms across most benchmarks.
Choose GPT-5.6 Sol if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you want the most recent training data — it shipped Jul 2026
Choose o1-pro if…
- you are already invested in the OpenAI ecosystem
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.6 Sol outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks.
GPT-5.6 Sol significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Context Window
Maximum input and output token capacity
Only GPT-5.6 Sol specifies input context (1,050,000 tokens). Only GPT-5.6 Sol specifies output context (128,000 tokens).
Input Capabilities
Supported data types and modalities
Both GPT-5.6 Sol and o1-pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.6 Sol
o1-pro
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-5.6 Sol was released on 2026-07-09, while o1-pro was released on 2024-12-17.
GPT-5.6 Sol is 19 months newer than o1-pro.
Jul 9, 2026
1 weeks ago
1.6yr newerDec 17, 2024
1.6 years ago
Knowledge Cutoff
When training data ends
GPT-5.6 Sol has a knowledge cutoff of 2026-02-16, while o1-pro has a cutoff of 2023-09-30.
GPT-5.6 Sol has more recent training data (up to 2026-02-16), making it potentially better informed about events through that date compared to o1-pro (2023-09-30).
Feb 2026
2.4 yr newerSep 2023
Outputs Comparison
Key Takeaways
GPT-5.6 Sol
View detailsOpenAI
o1-pro
View detailsOpenAI
No standout differentiators in the data we have for this pair.
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.6 Sol and o1-pro side-by-side, then vote on the output you prefer.
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FAQ
Common questions about GPT-5.6 Sol vs o1-pro.