Model Comparison
DeepSeek-V4-Pro-Max vs GPT-5.5 ProWhich is better in 2026?
GPT-5.5 Pro significantly outperforms across most benchmarks. DeepSeek-V4-Pro-Max is 33.8x cheaper per token.
Verdict: DeepSeek-V4-Pro-Max vs GPT-5.5 Pro — which is better?
DeepSeek-V4-Pro-Max (by DeepSeek) 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.
DeepSeek-V4-Pro-Max outperforms in 0 benchmarks, while GPT-5.5 Pro is better at 2 benchmarks (BrowseComp, Humanity's Last Exam). GPT-5.5 Pro significantly outperforms across most benchmarks.
On price, DeepSeek-V4-Pro-Max is roughly 33.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.5 Pro also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose DeepSeek-V4-Pro-Max if…
- cost matters — it's about 33.8x cheaper per token
- you need open weights you can self-host or fine-tune
Choose GPT-5.5 Pro if…
- you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
- you process long inputs — it offers a 1,050,000 token context window
Performance Benchmarks
Comparative analysis across standard metrics
DeepSeek-V4-Pro-Max outperforms in 0 benchmarks, while GPT-5.5 Pro is better at 2 benchmarks (BrowseComp, 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, DeepSeek-V4-Pro-Max ($1.60/1M tokens) is 18.8x cheaper than GPT-5.5 Pro ($30.00/1M tokens).
For output processing, DeepSeek-V4-Pro-Max ($3.20/1M tokens) is 56.3x cheaper than GPT-5.5 Pro ($180.00/1M tokens).
In conclusion, GPT-5.5 Pro is more expensive than DeepSeek-V4-Pro-Max.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.5 Pro accepts 1,050,000 input tokens compared to DeepSeek-V4-Pro-Max's 1,048,576 tokens. DeepSeek-V4-Pro-Max can generate longer responses up to 131,072 tokens, while GPT-5.5 Pro is limited to 128,000 tokens.
Input Capabilities
Supported data types and modalities
GPT-5.5 Pro supports multimodal inputs, whereas DeepSeek-V4-Pro-Max does not.
GPT-5.5 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.
DeepSeek-V4-Pro-Max
GPT-5.5 Pro
License
Usage and distribution terms
DeepSeek-V4-Pro-Max is licensed under MIT, while GPT-5.5 Pro uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
MIT
Open weights
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
GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while DeepSeek-V4-Pro-Max's cutoff date is not specified.
We can confirm GPT-5.5 Pro's training data extends to 2025-12-01, but cannot make a direct comparison without DeepSeek-V4-Pro-Max's cutoff date.
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Dec 2025
Provider Availability
DeepSeek-V4-Pro-Max is available from Novita, DeepInfra, DeepSeek, Fireworks, Together. GPT-5.5 Pro is available from OpenAI.
DeepSeek-V4-Pro-Max
GPT-5.5 Pro
Outputs Comparison
Key Takeaways
DeepSeek-V4-Pro-Max
View detailsDeepSeek
GPT-5.5 Pro
View detailsOpenAI
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against DeepSeek-V4-Pro-Max and GPT-5.5 Pro side-by-side, then vote on the output you prefer.
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FAQ
Common questions about DeepSeek-V4-Pro-Max vs GPT-5.5 Pro.