Model Comparison
GPT-5.5 Instant vs MiMo-V2.5Which is better in 2026?
Both models are evenly matched across the benchmarks. MiMo-V2.5 is 53.6x cheaper per token.
Verdict: GPT-5.5 Instant vs MiMo-V2.5 — which is better?
GPT-5.5 Instant (by OpenAI) and MiMo-V2.5 (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 (CharXiv-R), while MiMo-V2.5 is better at 1 benchmark (MMMU-Pro). Both models are evenly matched across the benchmarks.
On price, MiMo-V2.5 is roughly 53.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
MiMo-V2.5 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 most recent training data — it shipped May 2026
Choose MiMo-V2.5 if…
- cost matters — it's about 53.6x 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 (CharXiv-R), while MiMo-V2.5 is better at 1 benchmark (MMMU-Pro).
Both models are evenly matched across the 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 29.8x more expensive than MiMo-V2.5 ($0.17/1M tokens).
For output processing, GPT-5.5 Instant ($30.00/1M tokens) is 89.3x more expensive than MiMo-V2.5 ($0.34/1M tokens).
In conclusion, GPT-5.5 Instant is more expensive than MiMo-V2.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
MiMo-V2.5 accepts 1,048,576 input tokens compared to GPT-5.5 Instant's 400,000 tokens. MiMo-V2.5 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
Both GPT-5.5 Instant and MiMo-V2.5 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.5 Instant
MiMo-V2.5
License
Usage and distribution terms
GPT-5.5 Instant is licensed under a proprietary license, while MiMo-V2.5 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 was released on 2026-04-22.
GPT-5.5 Instant is 0 month newer than MiMo-V2.5.
May 5, 2026
2 months ago
1w newerApr 22, 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'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's cutoff date.
Aug 2025
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Provider Availability
GPT-5.5 Instant is available from OpenAI. MiMo-V2.5 is available from Novita, DeepInfra.
GPT-5.5 Instant
MiMo-V2.5
Outputs Comparison
Key Takeaways
MiMo-V2.5
View detailsXiaomi
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.5 Instant and MiMo-V2.5 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.