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GPT-5 Codex vs MiMo-V2-Omni

MiMo-V2-Omni significantly outperforms across most benchmarks.

OpenAI · Xiaomi · Updated for 2026

Which is better?

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

Based on current benchmark, pricing, and model metadata for 2026.

Choose GPT-5 Codex

  • you are already invested in the OpenAI ecosystem

Choose MiMo-V2-Omni

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Mar 2026

At a glance

The differences that matter most.

GPT-5 Codex
OpenAI
MiMo-V2-Omni
Xiaomi
Benchmark wins
0 of 1
1 of 1
Input price
— / M
$0.40 / M
Output price
— / M
$2.00 / M
Context window
—
262,000
Released
Sep 2025
Mar 2026
License
Proprietary
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

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

MiMo-V2-Omni significantly outperforms across most benchmarks.

Tue Aug 25 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Context Window

Maximum input and output token capacity

Only MiMo-V2-Omni specifies input context (262,000 tokens). Only MiMo-V2-Omni specifies output context (16,384 tokens).

OpenAI
GPT-5 Codex
Input- tokens
Output- tokens
Xiaomi
MiMo-V2-Omni
Input262,000 tokens
Output16,384 tokens
Tue Aug 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

MiMo-V2-Omni supports multimodal inputs, whereas GPT-5 Codex does not.

MiMo-V2-Omni can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5 Codex

Text
Images
Audio
Video

MiMo-V2-Omni

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-5 Codex

Proprietary

Closed source

MiMo-V2-Omni

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5 Codex was released on 2025-09-15, while MiMo-V2-Omni was released on 2026-03-18.

MiMo-V2-Omni is 6 months newer than GPT-5 Codex.

GPT-5 Codex

Sep 15, 2025

11 months ago

MiMo-V2-Omni

Mar 18, 2026

5 months ago

6mo newer

Knowledge Cutoff

When training data ends

GPT-5 Codex has a documented knowledge cutoff of 2024-09-30, while MiMo-V2-Omni'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-Omni's cutoff date.

GPT-5 Codex

Sep 2024

MiMo-V2-Omni

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-5 Codex and MiMo-V2-Omni side-by-side, then vote on the output you prefer.

GPT-5 Codex
✓ Preferred
MiMo-V2-Omni
Open in Playground

FAQ

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

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

MiMo-V2-Omni significantly outperforms across most benchmarks. GPT-5 Codex is made by OpenAI and MiMo-V2-Omni 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-Omni in benchmarks?

GPT-5 Codex scores SWE-Bench Verified: 74.5%. MiMo-V2-Omni scores PinchBench: 81.2%, SWE-Bench Verified: 74.8%, Claw-Eval: 54.8%, MM-BrowserComp: 52.0%, OmniGAIA: 49.8%.

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

GPT-5 Codex supports an unknown number of tokens and MiMo-V2-Omni supports 262K 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-Omni?

Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

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

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

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