GPT-5.5 vs MiMo-V2.6-Pro
GPT-5.5 and MiMo-V2.6-Pro are closely matched at 48.0 and 49.8 on the LLM Stats Score. MiMo-V2.6-Pro is 20.7x cheaper per token.
OpenAI · Xiaomi · Updated for 2026
Which is better?
GPT-5.5 and MiMo-V2.6-Pro are closely matched on the overall LLM Stats Score at 48.0 and 49.8.
In the 3 individual benchmarks reported for both models, MiMo-V2.6-Pro wins 3; this is a narrower head-to-head signal than the composite indexes.
On price, MiMo-V2.6-Pro is roughly 20.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.5 also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.5
- you process long inputs — it offers a 1,050,000 token context window
Choose MiMo-V2.6-Pro
- your work emphasizes agents — it leads those capability indexes
- you value its reported benchmark strengths — it wins 3 of 3 exact shared results
- cost matters — it's about 20.7x cheaper per token
- you want the most recent training data — it shipped Sep 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
28 reported for GPT-5.5 · 18 for MiMo-V2.6-Pro
GPT-5.5 outperforms in 0 benchmarks, while MiMo-V2.6-Pro is better at 3 benchmarks (CyberGym, DeepSWE 1.1, OSWorld-Verified).
MiMo-V2.6-Pro significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.5 ($5.00/1M tokens) is 11.5x more expensive than MiMo-V2.6-Pro ($0.43/1M tokens).
For output processing, GPT-5.5 ($30.00/1M tokens) is 34.5x more expensive than MiMo-V2.6-Pro ($0.87/1M tokens).
In conclusion, GPT-5.5 is more expensive than MiMo-V2.6-Pro.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.5 accepts 1,050,000 input tokens compared to MiMo-V2.6-Pro's 1,048,576 tokens. Only GPT-5.5 specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
Both GPT-5.5 and MiMo-V2.6-Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.5
MiMo-V2.6-Pro
License
Usage and distribution terms
GPT-5.5 is licensed under a proprietary license, while MiMo-V2.6-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 was released on 2026-04-23, while MiMo-V2.6-Pro was released on 2026-09-22.
MiMo-V2.6-Pro is 5 months newer than GPT-5.5.
Apr 23, 2026
5 months ago
Sep 22, 2026
-1 days ago
5mo newerKnowledge Cutoff
When training data ends
GPT-5.5 has a documented knowledge cutoff of 2025-12-01, while MiMo-V2.6-Pro's cutoff date is not specified.
We can confirm GPT-5.5's training data extends to 2025-12-01, but cannot make a direct comparison without MiMo-V2.6-Pro's cutoff date.
Dec 2025
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Provider Availability
GPT-5.5 is available from OpenAI. MiMo-V2.6-Pro is available from Xiaomi.
GPT-5.5
MiMo-V2.6-Pro
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.5 and MiMo-V2.6-Pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.5 vs MiMo-V2.6-Pro.