GPT-4.5
Nothing here. The model returned empty. We stared at it for a while.
GPT-4.5 vs GPT OSS 20B
Compare GPT-4.5 and GPT OSS 20B, both from OpenAI, context windows of 128K vs 131K, tested across 25 shared challenges. Updated April 2026.
Which is better, GPT-4.5 or GPT OSS 20B?
GPT-4.5 and GPT OSS 20B are both competitive models. GPT-4.5 costs $75/M input tokens vs $0.02/M for GPT OSS 20B. Context windows: 128K vs 131K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-4.5 and GPT OSS 20B
GPT-4.5 is made by openai while GPT OSS 20B is from openai. GPT-4.5 has a 128K token context window compared to GPT OSS 20B's 131K. On pricing, GPT-4.5 costs $75/M input tokens vs $0.02/M for GPT OSS 20B.
Our Verdict
GPT-4.5
GPT OSS 20B
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT OSS 20B is 1500x cheaper per token — worth considering if cost matters.
Too close to call
Writing DNA
Style Comparison
Similarity
99%
GPT OSS 20B uses 10.2x more emoji
GPT-4.5
GPT OSS 20B
63%Vocabulary54%
16wSentence Length17w
0.57Hedging0.26
4.7Bold5.9
6.4Lists3.3
0.00Emoji0.10
1.30Headings0.75
0.54Transitions0.32
Based on 11 + 21 text responses
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ