o3 vs Claude Sonnet 5
OpenAI's most powerful reasoning model — top across math, coding, and science.
Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.
No captured outputs for these models yet.
Frequently Asked Questions: o3 vs Claude Sonnet 5▼
Which is better, o3 or Claude Sonnet 5?
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Based on the Capability Index, Claude Sonnet 5 scores higher (80.1 vs 79.2). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Which is cheaper, o3 or Claude Sonnet 5?
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o3 has a lower blended cost. o3: $2.00 input / $8.00 output. Claude Sonnet 5: $3.00 input / $15.00 output.
Which has a larger context window, o3 or Claude Sonnet 5?
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Claude Sonnet 5 has a larger context window: o3 supports 200K tokens vs Claude Sonnet 5 at 1M tokens.
Do both o3 and Claude Sonnet 5 support vision?
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Yes, both o3 and Claude Sonnet 5 support vision/image input.
What are the key differences between o3 and Claude Sonnet 5?
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o3 and Claude Sonnet 5 have similar overall capabilities. The main differences lie in pricing, context window size, and provider-specific strengths. Use this comparison page to review all metrics side by side.
Which model should I choose for my use case?
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If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both o3 and Claude Sonnet 5 for free on idapt.app to see which performs better for your specific needs.