What is the difference between GPT-5.1 Codex Max and Qwen3.5 Flash?

GPT-5.1 Codex Max is developed by OpenAI while Qwen3.5 Flash is developed by Qwen. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 Codex Max or Qwen3.5 Flash?

It depends on your use case. GPT-5.1 Codex Max and Qwen3.5 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How can I compare GPT-5.1 Codex Max and Qwen3.5 Flash on Rival?

This page shows a side-by-side comparison of GPT-5.1 Codex Max and Qwen3.5 Flash across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

What is the difference between GPT-5.1 Codex Max and Qwen3.5 Flash?

GPT-5.1 Codex Max is developed by OpenAI while Qwen3.5 Flash is developed by Qwen. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 Codex Max or Qwen3.5 Flash?

It depends on your use case. GPT-5.1 Codex Max and Qwen3.5 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How can I compare GPT-5.1 Codex Max and Qwen3.5 Flash on Rival?

This page shows a side-by-side comparison of GPT-5.1 Codex Max and Qwen3.5 Flash across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

GPT-5.1 Codex Max vs Qwen3.5 Flash: Which Is Better?

Updated Feb 2026

Our Verdict

GPT-5.1 Codex Max

Qwen3.5 FlashRunner-up

No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier, major provider backing.

Too close to call

What do GPT-5.1 Codex Max and Qwen3.5 Flash say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

GPT-5.1 Codex Max

Input

—

Output

—

Qwen3.5 Flash

Input

$0.10

Output

$0.40

Writing DNA

Style Comparison

Similarity

45%

Qwen3.5 Flash uses 2.5x more emoji

GPT-5.1 Codex Max

Qwen3.5 Flash

60%Vocabulary50%

16wSentence Length14w

0.36Hedging0.35

2.3Bold6.9

4.2Lists4.2

0.00Emoji0.03

0.12Headings1.00

0.03Transitions0.15

Based on 13 + 23 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-5.1 Codex Max vs Ox AlphaNew provider

GPT-5.1 Codex Max vs MiniMax M3New provider

GPT-5.1 Codex Max vs Llama 4 MaverickNew provider

Updated Feb 2026

Our Verdict

GPT-5.1 Codex Max

Qwen3.5 FlashRunner-up

No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier, major provider backing.

Too close to call

What do GPT-5.1 Codex Max and Qwen3.5 Flash say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

GPT-5.1 Codex Max

Input

—

Output

—

Qwen3.5 Flash

Input

$0.10

Output

$0.40

Writing DNA

Style Comparison

Similarity

45%

Qwen3.5 Flash uses 2.5x more emoji

GPT-5.1 Codex Max

Qwen3.5 Flash

60%Vocabulary50%

16wSentence Length14w

0.36Hedging0.35

2.3Bold6.9

4.2Lists4.2

0.00Emoji0.03

0.12Headings1.00

0.03Transitions0.15

Based on 13 + 23 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

GPT-5.1 Codex Max vs Ox AlphaNew provider

GPT-5.1 Codex Max vs MiniMax M3New provider

GPT-5.1 Codex Max vs Llama 4 MaverickNew provider