Claude Sonnet 5 vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Sonnet 5 by Anthropic wins on 4 of 7 benchmarks against o3 by OpenAI, which leads on 2. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, Claude Sonnet 5 scores 1272 on Design Arena ELO compared to o3's 1074, while Claude Sonnet 5 scores 1289 on Website Arena ELO compared to o3's 1048.
Reasoning: In reasoning, o3 scores 83.3% on GPQA Diamond compared to Claude Sonnet 5's 81.4%.
Context: In context, Claude Sonnet 5 scores 1.0M on Context Length compared to o3's 200K.
Pricing Comparison
Claude Sonnet 5 costs $2.0/1M input tokens and $10.0/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. Both models are priced identically for input tokens.
Verdict
Claude Sonnet 5 and o3 are closely matched. The best choice depends on your specific use case and priorities.
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Claude Sonnet 5 vs o3 — FAQ
Which is better, Claude Sonnet 5 or o3?
Claude Sonnet 5 wins on more benchmarks overall (4 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Sonnet 5 compare to o3 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Claude Sonnet 5 cheaper than o3?
Both models are priced the same at $2.0/1M input tokens. Claude Sonnet 5 output costs $10.0/1M and o3 output costs $8.0/1M.
Which is faster, Claude Sonnet 5 or o3?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the Claude Sonnet 5 vs o3 comparison cover?
This comparison covers 7 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, Cached Input Cost, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.