o1 vs Claude 3 Opus

Compare o1 by OpenAI against Claude 3 Opus by Anthropic, context windows of 128K vs 200K, tested across 8 shared challenges. Updated March 2026.

Which is better, o1 or Claude 3 Opus?

o1 and Claude 3 Opus are both competitive models. o1 costs $15/M input tokens vs $15/M for Claude 3 Opus. Context windows: 128K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between o1 and Claude 3 Opus

o1 is made by openai while Claude 3 Opus is from anthropic. o1 has a 128K token context window compared to Claude 3 Opus's 200K. On pricing, o1 costs $15/M input tokens vs $15/M for Claude 3 Opus.

Our Verdict
Claude 3 Opus
Claude 3 Opus
o1
o1Runner-up

No community votes yet. On paper, Claude 3 Opus has the edge — bigger model tier, bigger context window.

Too close to call
FAQ

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