GPT OSS 120B vs o3 Mini
Compare GPT OSS 120B and o3 Mini, both from OpenAI, context windows of 131K vs 64K, tested across 54 shared challenges. Updated April 2026.
Which is better, GPT OSS 120B or o3 Mini?
GPT OSS 120B and o3 Mini are both competitive models. GPT OSS 120B costs $0.18/M input tokens vs $1.1/M for o3 Mini. Context windows: 131K vs 64K tokens. Compare their real outputs side by side below.
Key Differences Between GPT OSS 120B and o3 Mini
GPT OSS 120B is made by openai while o3 Mini is from openai. GPT OSS 120B has a 131K token context window compared to o3 Mini's 64K. On pricing, GPT OSS 120B costs $0.18/M input tokens vs $1.1/M for o3 Mini.
No community votes yet. On paper, GPT OSS 120B has the edge — bigger model tier, newer, bigger context window.
GPT OSS 120B is 5.5x cheaper per token — worth considering if cost matters.
Style Comparison
GPT OSS 120B uses 15.4x 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.
