Compare Claude Opus 4 by Anthropic against OpenAI o4 Mini High by OpenAI, in 6 community votes, claude opus 4 wins 60% of head-to-head duels, context windows of 200K vs 200K, tested across 53 shared challenges. Updated April 2026.
Claude Opus 4 is the better choice overall, winning 60% of 6 blind community votes on Rival. Claude Opus 4 costs $15/M input tokens vs $1.1/M for OpenAI o4 Mini High. Context windows: 200K vs 200K tokens. Compare their real outputs side by side below.
Claude Opus 4 is made by anthropic while OpenAI o4 Mini High is from openai. Claude Opus 4 has a 200K token context window compared to OpenAI o4 Mini High's 200K. On pricing, Claude Opus 4 costs $15/M input tokens vs $1.1/M for OpenAI o4 Mini High. In community voting, In 6 community votes, Claude Opus 4 wins 60% of head-to-head duels.
In 6 community votes, Claude Opus 4 wins 60% of head-to-head duels. Claude Opus 4 leads in Image Generation. Based on blind community voting from the Rival open dataset of 6+ human preference judgments for this pair.
Pick Claude Opus 4. In 6 blind votes, Claude Opus 4 wins 60% of the time. That's not luck.
Claude Opus 4 particularly excels in Image Generation. OpenAI o4 Mini High is 17x cheaper per token — worth considering if cost matters.
Claude Opus 4 uses 444.0x more bold
Ask 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.

Compare Claude Opus 4 by Anthropic against OpenAI o4 Mini High by OpenAI, in 6 community votes, claude opus 4 wins 60% of head-to-head duels, context windows of 200K vs 200K, tested across 53 shared challenges. Updated April 2026.
Claude Opus 4 is the better choice overall, winning 60% of 6 blind community votes on Rival. Claude Opus 4 costs $15/M input tokens vs $1.1/M for OpenAI o4 Mini High. Context windows: 200K vs 200K tokens. Compare their real outputs side by side below.
Claude Opus 4 is made by anthropic while OpenAI o4 Mini High is from openai. Claude Opus 4 has a 200K token context window compared to OpenAI o4 Mini High's 200K. On pricing, Claude Opus 4 costs $15/M input tokens vs $1.1/M for OpenAI o4 Mini High. In community voting, In 6 community votes, Claude Opus 4 wins 60% of head-to-head duels.
In 6 community votes, Claude Opus 4 wins 60% of head-to-head duels. Claude Opus 4 leads in Image Generation. Based on blind community voting from the Rival open dataset of 6+ human preference judgments for this pair.
Pick Claude Opus 4. In 6 blind votes, Claude Opus 4 wins 60% of the time. That's not luck.
Claude Opus 4 particularly excels in Image Generation. OpenAI o4 Mini High is 17x cheaper per token — worth considering if cost matters.
Claude Opus 4 uses 444.0x more bold
Ask 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.

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36+ more head-to-head results. Free. Not a trick.
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48 fights queued
36+ more head-to-head results. Free. Not a trick.
Free account. No card required. By continuing, you agree to Rival's Terms and Privacy Policy