ChatGPT-4o (March 2025) vs GPT OSS 120B
Compare ChatGPT-4o (March 2025) and GPT OSS 120B, both from OpenAI, context windows of 128K vs 131K, tested across 32 shared challenges. Updated April 2026.
Which is better, ChatGPT-4o (March 2025) or GPT OSS 120B?
ChatGPT-4o (March 2025) and GPT OSS 120B are both competitive models. ChatGPT-4o (March 2025) costs $5/M input tokens vs $0.18/M for GPT OSS 120B. Context windows: 128K vs 131K tokens. Compare their real outputs side by side below.
Key Differences Between ChatGPT-4o (March 2025) and GPT OSS 120B
ChatGPT-4o (March 2025) is made by openai while GPT OSS 120B is from openai. ChatGPT-4o (March 2025) has a 128K token context window compared to GPT OSS 120B's 131K. On pricing, ChatGPT-4o (March 2025) costs $5/M input tokens vs $0.18/M for GPT OSS 120B.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT OSS 120B is 19x cheaper per token — worth considering if cost matters.
Style Comparison
ChatGPT-4o (March 2025) uses 6.1x more emoji
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.
