Model Comparison

GPT-5 Codex vs MiMo-V2-FlashWhich is better in 2026?

GPT-5 Codex significantly outperforms across most benchmarks.

Verdict: GPT-5 Codex vs MiMo-V2-Flash — which is better?

GPT-5 Codex (by OpenAI) and MiMo-V2-Flash (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 Codex outperforms in 1 benchmarks (SWE-Bench Verified), while MiMo-V2-Flash is better at 0 benchmarks. GPT-5 Codex significantly outperforms across most benchmarks.

Choose GPT-5 Codex if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks

Choose MiMo-V2-Flash if…

  • you want the most recent training data — it shipped Dec 2025
  • you need open weights you can self-host or fine-tune
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5 Codex outperforms in 1 benchmarks (SWE-Bench Verified), while MiMo-V2-Flash is better at 0 benchmarks.

GPT-5 Codex significantly outperforms across most benchmarks.

Thu Jun 11 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only MiMo-V2-Flash specifies input context (256,000 tokens). Only MiMo-V2-Flash specifies output context (16,384 tokens).

OpenAI
GPT-5 Codex
Input- tokens
Output- tokens
Xiaomi
MiMo-V2-Flash
Input256,000 tokens
Output16,384 tokens
Thu Jun 11 2026 • llm-stats.com

License

Usage and distribution terms

GPT-5 Codex is licensed under a proprietary license, while MiMo-V2-Flash uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

GPT-5 Codex

Proprietary

Closed source

MiMo-V2-Flash

MIT

Open weights

Release Timeline

When each model was launched

GPT-5 Codex was released on 2025-09-15, while MiMo-V2-Flash was released on 2025-12-16.

MiMo-V2-Flash is 3 months newer than GPT-5 Codex.

GPT-5 Codex

Sep 15, 2025

8 months ago

MiMo-V2-Flash

Dec 16, 2025

5 months ago

3mo newer

Knowledge Cutoff

When training data ends

GPT-5 Codex has a documented knowledge cutoff of 2024-09-30, while MiMo-V2-Flash's cutoff date is not specified.

We can confirm GPT-5 Codex's training data extends to 2024-09-30, but cannot make a direct comparison without MiMo-V2-Flash's cutoff date.

GPT-5 Codex

Sep 2024

MiMo-V2-Flash

—

Outputs Comparison

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Key Takeaways

OpenAI
Higher SWE-Bench Verified score (74.5% vs 73.4%)
Xiaomi
Larger context window (256,000 tokens)
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5 Codex
Xiaomi
MiMo-V2-Flash

FAQ

Common questions about GPT-5 Codex vs MiMo-V2-Flash.

Which is better, GPT-5 Codex or MiMo-V2-Flash?

GPT-5 Codex significantly outperforms across most benchmarks. GPT-5 Codex is made by OpenAI and MiMo-V2-Flash is made by Xiaomi. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5 Codex compare to MiMo-V2-Flash in benchmarks?

GPT-5 Codex scores SWE-Bench Verified: 74.5%. MiMo-V2-Flash scores AIME 2025: 94.1%, Arena-Hard v2: 86.2%, MMLU-Pro: 84.9%, HMMT 2025: 84.4%, GPQA: 83.7%.

What are the context window sizes for GPT-5 Codex and MiMo-V2-Flash?

GPT-5 Codex supports an unknown number of tokens and MiMo-V2-Flash supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5 Codex and MiMo-V2-Flash?

Key differences include licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5 Codex and MiMo-V2-Flash?

GPT-5 Codex is developed by OpenAI and MiMo-V2-Flash is developed by Xiaomi.

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