o3 Mini vs ChatGPT-4o (March 2025)

Compare o3 Mini and ChatGPT-4o (March 2025), both from OpenAI, context windows of 64K vs 128K, tested across 32 shared challenges. Updated March 2026.

Which is better, o3 Mini or ChatGPT-4o (March 2025)?

o3 Mini and ChatGPT-4o (March 2025) are both competitive models. o3 Mini costs $1.1/M input tokens vs $5/M for ChatGPT-4o (March 2025). Context windows: 64K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between o3 Mini and ChatGPT-4o (March 2025)

o3 Mini is made by openai while ChatGPT-4o (March 2025) is from openai. o3 Mini has a 64K token context window compared to ChatGPT-4o (March 2025)'s 128K. On pricing, o3 Mini costs $1.1/M input tokens vs $5/M for ChatGPT-4o (March 2025).

Our Verdict
ChatGPT-4o (March 2025)
ChatGPT-4o (March 2025)
o3 Mini
o3 MiniRunner-up

No community votes yet. On paper, ChatGPT-4o (March 2025) has the edge — bigger model tier, newer, bigger context window.

o3 Mini is 3.4x cheaper per token — worth considering if cost matters.

Slight edge
vs

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