Model Comparison
GPT-5.5 vs GPT-5.5 ProWhich is better in 2026?
GPT-5.5 Pro significantly outperforms across most benchmarks. GPT-5.5 is 6.0x cheaper per token.
Verdict: GPT-5.5 vs GPT-5.5 Pro — which is better?
GPT-5.5 (by OpenAI) and GPT-5.5 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-5.5 outperforms in 1 benchmarks (GDPval-MM), while GPT-5.5 Pro is better at 4 benchmarks (BrowseComp, FrontierMath, GeneBench, Humanity's Last Exam). GPT-5.5 Pro significantly outperforms across most benchmarks.
On price, GPT-5.5 is roughly 6.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Choose GPT-5.5 if…
- cost matters — it's about 6.0x cheaper per token
Choose GPT-5.5 Pro if…
- you want the strongest raw capability — it leads on 4 of 5 shared benchmarks
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.5 outperforms in 1 benchmarks (GDPval-MM), while GPT-5.5 Pro is better at 4 benchmarks (BrowseComp, FrontierMath, GeneBench, Humanity's Last Exam).
GPT-5.5 Pro significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.5 ($5.00/1M tokens) is 6.0x cheaper than GPT-5.5 Pro ($30.00/1M tokens).
For output processing, GPT-5.5 ($30.00/1M tokens) is 6.0x cheaper than GPT-5.5 Pro ($180.00/1M tokens).
In conclusion, GPT-5.5 Pro is more expensive than GPT-5.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,050,000 tokens. Both models can generate responses up to 128,000 tokens.
Input Capabilities
Supported data types and modalities
Both GPT-5.5 and GPT-5.5 Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.5
GPT-5.5 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
Both models were released on 2026-04-23.
They likely represent similar generations of model development.
Apr 23, 2026
2 months ago
Apr 23, 2026
2 months ago
Knowledge Cutoff
When training data ends
Both models have the same knowledge cutoff date of 2025-12-01.
They should have similar awareness of historical events and information up to this date.
Dec 2025
Dec 2025
Provider Availability
GPT-5.5 is available from OpenAI. GPT-5.5 Pro is available from OpenAI.
GPT-5.5
GPT-5.5 Pro
Outputs Comparison
Key Takeaways
GPT-5.5
View detailsOpenAI
GPT-5.5 Pro
View detailsOpenAI
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.5 and GPT-5.5 Pro side-by-side, then vote on the output you prefer.
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FAQ
Common questions about GPT-5.5 vs GPT-5.5 Pro.