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GPT-5.1 Codex Mini vs Qwen3.5-4B

Qwen3.5-4B leads the LLM Stats Score 19.4 to -2.5.

OpenAI · Alibaba Cloud / Qwen Team · Updated for 2026

Which is better?

Qwen3.5-4B leads the overall LLM Stats Score 19.4 to -2.5, ranking #194 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-5.1 Codex Mini

  • you want predictable pricing at $0.25/M input and $2.00/M output

Choose Qwen3.5-4B

  • overall performance matters — it scores 19.4 and ranks #194 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Mar 2026
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

GPT-5.1 Codex Mini
OpenAI
Qwen3.5-4B
Alibaba Cloud / Qwen Team
Core performance indexes
LLM Stats Score
-2.5
#329
19.4
#194
Reasoning
-2.4
#320
19.8
#186
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.25 / M
— / M
Output price
$2.00 / M
— / M
Context window
400,000
—

Individual benchmarks

1 reported for GPT-5.1 Codex Mini · 25 for Qwen3.5-4B

No common benchmarks found

GPT-5.1 Codex Mini and Qwen3.5-4Bdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-5.1 Codex Mini specifies input context (400,000 tokens). Only GPT-5.1 Codex Mini specifies output context (128,000 tokens).

OpenAI
GPT-5.1 Codex Mini
Input400,000 tokens
Output128,000 tokens
Alibaba Cloud / Qwen Team
Qwen3.5-4B
Input- tokens
Output- tokens
Fri Sep 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-5.1 Codex Mini and Qwen3.5-4B support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-5.1 Codex Mini

Text
Images
Audio
Video

Qwen3.5-4B

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5.1 Codex Mini is licensed under a proprietary license, while Qwen3.5-4B uses Apache 2.0.

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

GPT-5.1 Codex Mini

Proprietary

Closed source

Qwen3.5-4B

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT-5.1 Codex Mini was released on 2025-11-12, while Qwen3.5-4B was released on 2026-03-02.

Qwen3.5-4B is 4 months newer than GPT-5.1 Codex Mini.

GPT-5.1 Codex Mini

Nov 12, 2025

9 months ago

Qwen3.5-4B

Mar 2, 2026

6 months ago

3mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-5.1 Codex Mini and Qwen3.5-4B side-by-side, then vote on the output you prefer.

GPT-5.1 Codex Mini
✓ Preferred
Qwen3.5-4B
Open in Playground

FAQ

Common questions about GPT-5.1 Codex Mini vs Qwen3.5-4B.

Which is better, GPT-5.1 Codex Mini or Qwen3.5-4B?

Qwen3.5-4B leads the LLM Stats Score 19.4 to -2.5. GPT-5.1 Codex Mini is made by OpenAI and Qwen3.5-4B is made by Alibaba Cloud / Qwen Team. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-5.1 Codex Mini compare to Qwen3.5-4B in benchmarks?

GPT-5.1 Codex Mini scores AIME 2025: 42.1%. Qwen3.5-4B scores IFEval: 89.8%, MMLU-Redux: 88.8%, C-Eval: 85.1%, t2-bench: 79.9%, MMLU-Pro: 79.1%.

What are the context window sizes for GPT-5.1 Codex Mini and Qwen3.5-4B?

GPT-5.1 Codex Mini supports 400K tokens and Qwen3.5-4B supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.1 Codex Mini and Qwen3.5-4B?

Key differences include LLM Stats Score (-2.5 vs 19.4), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.1 Codex Mini and Qwen3.5-4B?

GPT-5.1 Codex Mini is developed by OpenAI and Qwen3.5-4B is developed by Alibaba Cloud / Qwen Team.

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