Claude Opus 4.8 vs o3
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Opus 4.8 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 Opus 4.8 scores 1262 on Design Arena ELO compared to o3's 1074, while Claude Opus 4.8 scores 1267 on Website Arena ELO compared to o3's 1048.
Reasoning: In reasoning, Claude Opus 4.8 scores 89.6% on GPQA Diamond compared to o3's 83.3%.
Context: In context, Claude Opus 4.8 scores 1.0M on Context Length compared to o3's 200K.
Pricing Comparison
Claude Opus 4.8 costs $5.0/1M input tokens and $25.0/1M output tokens, while o3 costs $2.0/1M input and $8.0/1M output. o3 is the more affordable option for API usage.
Verdict
o3 leads across the board in affordability, making it the stronger overall choice in this comparison.
View Individual Model Pages
Claude Opus 4.8 vs o3 — FAQ
Which is better, Claude Opus 4.8 or o3?
Claude Opus 4.8 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 Opus 4.8 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 Opus 4.8 cheaper than o3?
Yes, o3 is cheaper. Claude Opus 4.8 costs $5.0/1M input and $25.0/1M output tokens. o3 costs $2.0/1M input and $8.0/1M output tokens.
Which is faster, Claude Opus 4.8 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 Opus 4.8 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.