o3 Mini vs GPT-4.5

Compare o3 Mini and GPT-4.5, both from OpenAI, in 14 community votes, gpt-4.5 wins 70% of head-to-head duels, context windows of 64K vs 128K, tested across 19 shared challenges. Updated March 2026.

Which is better, o3 Mini or GPT-4.5?

GPT-4.5 is the better choice overall, winning 70% of 14 blind community votes on Rival. o3 Mini costs $1.1/M input tokens vs $75/M for GPT-4.5. Context windows: 64K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between o3 Mini and GPT-4.5

o3 Mini is made by openai while GPT-4.5 is from openai. o3 Mini has a 64K token context window compared to GPT-4.5's 128K. On pricing, o3 Mini costs $1.1/M input tokens vs $75/M for GPT-4.5. In community voting, In 14 community votes, GPT-4.5 wins 70% of head-to-head duels.

In 14 community votes, GPT-4.5 wins 70% of head-to-head duels. GPT-4.5 leads in Reasoning, Image Generation. Based on blind community voting from the Rival open dataset of 14+ human preference judgments for this pair.

Reasoning: GPT-4.5 wins 75% of votes
Image Generation: GPT-4.5 wins 100% of votes
Web Design: o3 Mini and GPT-4.5 are tied
Our Verdict
GPT-4.5
GPT-4.5Winner
o3 Mini
o3 MiniRunner-up

Pick GPT-4.5. In 14 blind votes, GPT-4.5 wins 70% of the time. That's not luck.

GPT-4.5 particularly excels in Image Generation, Reasoning. o3 Mini is 34x cheaper per token — worth considering if cost matters.

Clear winner
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