GPT-5.3-Codex vs Qwen3.5 Plus 2026-02-15
Compare GPT-5.3-Codex by OpenAI against Qwen3.5 Plus 2026-02-15 by Qwen, context windows of 400K vs 1.0M, tested across 53 shared challenges.
Our Verdict
GPT-5.3-Codex
Qwen3.5 Plus 2026-02-15
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Qwen3.5 Plus 2026-02-15 is 5.8x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.3-Codex
Input
$1.75
Output
$14.00
Qwen3.5 Plus 2026-02-15
Input
$0.40
4.4× cheaper
Output
$2.40
5.8× cheaper
Qwen3.5 Plus 2026-02-15 is cheaper on both — 4.4× input, 5.8× output
Writing DNA
Style Comparison
Similarity
32%
Qwen3.5 Plus 2026-02-15 uses 3.4x more transitions
GPT-5.3-Codex
Qwen3.5 Plus 2026-02-15
65%Vocabulary54%
23wSentence Length18w
0.51Hedging0.51
6.5Bold5.3
6.2Lists2.9
0.16Emoji0.10
1.90Headings0.75
0.03Transitions0.09
Based on 23 + 23 text responses
Research
What we learned reading every model
FAQ
