GPT-3.5 Turbo vs GPT-5.1-Codex-Mini
Compare GPT-3.5 Turbo and GPT-5.1-Codex-Mini, both from OpenAI, context windows of 16K vs 400K, tested across 54 shared challenges. Updated April 2026.
Which is better, GPT-3.5 Turbo or GPT-5.1-Codex-Mini?
GPT-3.5 Turbo and GPT-5.1-Codex-Mini are both competitive models. GPT-3.5 Turbo costs $1.5/M input tokens vs $1.5/M for GPT-5.1-Codex-Mini. Context windows: 16K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-3.5 Turbo and GPT-5.1-Codex-Mini
GPT-3.5 Turbo is made by openai while GPT-5.1-Codex-Mini is from openai. GPT-3.5 Turbo has a 16K token context window compared to GPT-5.1-Codex-Mini's 400K. On pricing, GPT-3.5 Turbo costs $1.5/M input tokens vs $1.5/M for GPT-5.1-Codex-Mini.
No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — bigger model tier, newer, bigger context window.
GPT-3.5 Turbo is 3.0x cheaper per token — worth considering if cost matters.
Style Comparison
GPT-5.1-Codex-Mini uses 332.9x more bold
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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
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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.
