Model Comparison
GPT-5.5 Pro vs MiMo-V2.5-ProWhich is better in 2026?
GPT-5.5 Pro significantly outperforms across most benchmarks. MiMo-V2.5-Pro is 124.1x cheaper per token.
Verdict: GPT-5.5 Pro vs MiMo-V2.5-Pro — which is better?
GPT-5.5 Pro (by OpenAI) and MiMo-V2.5-Pro (by Xiaomi) 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 Pro outperforms in 1 benchmarks (Humanity's Last Exam), while MiMo-V2.5-Pro is better at 0 benchmarks. GPT-5.5 Pro significantly outperforms across most benchmarks.
On price, MiMo-V2.5-Pro is roughly 124.1x 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 GPT-5.5 Pro if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you process long inputs — it offers a 1,050,000 token context window
Choose MiMo-V2.5-Pro if…
- cost matters — it's about 124.1x cheaper per token
- you want the most recent training data — it shipped Apr 2026
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.5 Pro outperforms in 1 benchmarks (Humanity's Last Exam), while MiMo-V2.5-Pro is better at 0 benchmarks.
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 Pro ($30.00/1M tokens) is 69.0x more expensive than MiMo-V2.5-Pro ($0.43/1M tokens).
For output processing, GPT-5.5 Pro ($180.00/1M tokens) is 206.9x more expensive than MiMo-V2.5-Pro ($0.87/1M tokens).
In conclusion, GPT-5.5 Pro is more expensive than MiMo-V2.5-Pro.*
* 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 MiMo-V2.5-Pro's 1,048,576 tokens. MiMo-V2.5-Pro 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 MiMo-V2.5-Pro does not.
GPT-5.5 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-5.5 Pro
MiMo-V2.5-Pro
License
Usage and distribution terms
GPT-5.5 Pro is licensed under a proprietary license, while MiMo-V2.5-Pro uses MIT.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
MIT
Open weights
Release Timeline
When each model was launched
GPT-5.5 Pro was released on 2026-04-23, while MiMo-V2.5-Pro was released on 2026-04-27.
MiMo-V2.5-Pro is 0 month newer than GPT-5.5 Pro.
Apr 23, 2026
2 months ago
Apr 27, 2026
2 months ago
4d newerKnowledge Cutoff
When training data ends
GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while MiMo-V2.5-Pro'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 MiMo-V2.5-Pro's cutoff date.
Dec 2025
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Provider Availability
GPT-5.5 Pro is available from OpenAI. MiMo-V2.5-Pro is available from Xiaomi, DeepInfra, Novita.
GPT-5.5 Pro
MiMo-V2.5-Pro
Outputs Comparison
Key Takeaways
GPT-5.5 Pro
View detailsOpenAI
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.5 Pro and MiMo-V2.5-Pro side-by-side, then vote on the output you prefer.
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FAQ
Common questions about GPT-5.5 Pro vs MiMo-V2.5-Pro.