Model Comparison
GPT-5.5 Instant vs MiMo-V2.5-ProWhich is better in 2026?
GPT-5.5 Instant significantly outperforms across most benchmarks. MiMo-V2.5-Pro is 20.7x cheaper per token.
Verdict: GPT-5.5 Instant vs MiMo-V2.5-Pro — which is better?
GPT-5.5 Instant (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 Instant outperforms in 1 benchmarks (GPQA), while MiMo-V2.5-Pro is better at 0 benchmarks. GPT-5.5 Instant significantly outperforms across most benchmarks.
On price, MiMo-V2.5-Pro is roughly 20.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
MiMo-V2.5-Pro also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Choose GPT-5.5 Instant if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you want the most recent training data — it shipped May 2026
Choose MiMo-V2.5-Pro if…
- cost matters — it's about 20.7x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
- you need open weights you can self-host or fine-tune
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.5 Instant outperforms in 1 benchmarks (GPQA), while MiMo-V2.5-Pro is better at 0 benchmarks.
GPT-5.5 Instant significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.5 Instant ($5.00/1M tokens) is 11.5x more expensive than MiMo-V2.5-Pro ($0.43/1M tokens).
For output processing, GPT-5.5 Instant ($30.00/1M tokens) is 34.5x more expensive than MiMo-V2.5-Pro ($0.87/1M tokens).
In conclusion, GPT-5.5 Instant 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
MiMo-V2.5-Pro accepts 1,048,576 input tokens compared to GPT-5.5 Instant's 400,000 tokens. MiMo-V2.5-Pro can generate longer responses up to 131,072 tokens, while GPT-5.5 Instant is limited to 128,000 tokens.
Input Capabilities
Supported data types and modalities
GPT-5.5 Instant supports multimodal inputs, whereas MiMo-V2.5-Pro does not.
GPT-5.5 Instant can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-5.5 Instant
MiMo-V2.5-Pro
License
Usage and distribution terms
GPT-5.5 Instant 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 Instant was released on 2026-05-05, while MiMo-V2.5-Pro was released on 2026-04-27.
GPT-5.5 Instant is 0 month newer than MiMo-V2.5-Pro.
May 5, 2026
2 months ago
1w newerApr 27, 2026
2 months ago
Knowledge Cutoff
When training data ends
GPT-5.5 Instant has a documented knowledge cutoff of 2025-08-31, while MiMo-V2.5-Pro's cutoff date is not specified.
We can confirm GPT-5.5 Instant's training data extends to 2025-08-31, but cannot make a direct comparison without MiMo-V2.5-Pro's cutoff date.
Aug 2025
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Provider Availability
GPT-5.5 Instant is available from OpenAI. MiMo-V2.5-Pro is available from Xiaomi, DeepInfra, Novita.
GPT-5.5 Instant
MiMo-V2.5-Pro
Outputs Comparison
Key Takeaways
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.5 Instant 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 Instant vs MiMo-V2.5-Pro.