Model Comparison
MiniMax M3 vs GPT-5.5 InstantWhich is better in 2026?
MiniMax M3 significantly outperforms across most benchmarks. MiniMax M3 is 21.4x cheaper per token.
Verdict: MiniMax M3 vs GPT-5.5 Instant — which is better?
MiniMax M3 (by MiniMax) and GPT-5.5 Instant (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.
MiniMax M3 outperforms in 2 benchmarks (MMMU-Pro, OmniDocBench 1.5), while GPT-5.5 Instant is better at 0 benchmarks. MiniMax M3 significantly outperforms across most benchmarks.
On price, MiniMax M3 is roughly 21.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
MiniMax M3 also accepts a larger context window (512,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose MiniMax M3 if…
- you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
- cost matters — it's about 21.4x cheaper per token
- you process long inputs — it offers a 512,000 token context window
- you want the most recent training data — it shipped Jun 2026
- you need open weights you can self-host or fine-tune
Choose GPT-5.5 Instant if…
- you want predictable pricing at $5.00/M input and $30.00/M output
Performance Benchmarks
Comparative analysis across standard metrics
MiniMax M3 outperforms in 2 benchmarks (MMMU-Pro, OmniDocBench 1.5), while GPT-5.5 Instant is better at 0 benchmarks.
MiniMax M3 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, MiniMax M3 ($0.30/1M tokens) is 16.7x cheaper than GPT-5.5 Instant ($5.00/1M tokens).
For output processing, MiniMax M3 ($1.20/1M tokens) is 25.0x cheaper than GPT-5.5 Instant ($30.00/1M tokens).
In conclusion, GPT-5.5 Instant is more expensive than MiniMax M3.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
MiniMax M3 accepts 512,000 input tokens compared to GPT-5.5 Instant's 400,000 tokens. MiniMax M3 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 MiniMax M3 and GPT-5.5 Instant support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
MiniMax M3
GPT-5.5 Instant
License
Usage and distribution terms
MiniMax M3 is licensed under MIT, while GPT-5.5 Instant 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
MiniMax M3 was released on 2026-06-01, while GPT-5.5 Instant was released on 2026-05-05.
MiniMax M3 is 1 month newer than GPT-5.5 Instant.
Jun 1, 2026
1 months ago
3w newerMay 5, 2026
2 months ago
Knowledge Cutoff
When training data ends
GPT-5.5 Instant has a documented knowledge cutoff of 2025-08-31, while MiniMax M3'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 MiniMax M3's cutoff date.
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Aug 2025
Provider Availability
MiniMax M3 is available from Fireworks, Novita, Together, MiniMax. GPT-5.5 Instant is available from OpenAI.
MiniMax M3
GPT-5.5 Instant
Outputs Comparison
Key Takeaways
MiniMax M3
View detailsMiniMax
No standout differentiators in the data we have for this pair.
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against MiniMax M3 and GPT-5.5 Instant side-by-side, then vote on the output you prefer.
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FAQ
Common questions about MiniMax M3 vs GPT-5.5 Instant.