GPT-5.1-Codex vs Qwen3.5 9B
Compare GPT-5.1-Codex by OpenAI against Qwen3.5 9B by Qwen, context windows of 400K vs 262K, tested across 50 shared challenges. Updated April 2026.
Which is better, GPT-5.1-Codex or Qwen3.5 9B?
GPT-5.1-Codex and Qwen3.5 9B are both competitive models. GPT-5.1-Codex costs $1.25/M input tokens vs $0.1/M for Qwen3.5 9B. Context windows: 400K vs 262K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.1-Codex and Qwen3.5 9B
GPT-5.1-Codex is made by openai while Qwen3.5 9B is from qwen. GPT-5.1-Codex has a 400K token context window compared to Qwen3.5 9B's 262K. On pricing, GPT-5.1-Codex costs $1.25/M input tokens vs $0.1/M for Qwen3.5 9B.
No community votes yet. On paper, GPT-5.1-Codex has the edge — bigger model tier, bigger context window, major provider backing.
Qwen3.5 9B is 67x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-5.1-Codex uses 3.3x more transitions
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
