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Claude Sonnet 5 vs o3 Pro
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Sonnet 5
Mid-tiero3 Pro
FlagshipInput $/MTok
$2.00
$20.00
Output $/MTok
$10.00
$80.00
Cache discount
90% off
0% off
Context
1,000K
200K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
93
vs
0
Code Review
96
vs
0
Summarization
91
vs
0
Q&A
89
vs
0
Extraction
88
vs
0
Reasoning
90
vs
0
Classification
86
vs
0
Creative Writing
87
vs
0
Claude Sonnet 5
o3 Pro
Guidance
When to use Claude Sonnet 5 vs o3 Pro
Choose Claude Sonnet 5 when...
- -Cost matters: 90% cheaper on input tokens
- -You need a larger context window (1,000K vs 200K)
Choose o3 Pro when...
- Similar performance; consider provider preference or ecosystem fit.
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Sonnet 5
o3 Pro
100K tokens
$0.44Cheaper
$3.80
1M tokens
$4.40Cheaper
$38.00
10M tokens
$44.00Cheaper
$380.00
FAQ
When should I use Claude Sonnet 5 instead of o3 Pro?
Claude Sonnet 5 and o3 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o3 Pro cheaper than Claude Sonnet 5?
o3 Pro input costs $20.00/MTok, which is 900% more than Claude Sonnet 5 at $2.00/MTok.
What are the context window sizes for Claude Sonnet 5 and o3 Pro?
Claude Sonnet 5 has a 1,000K token context window. o3 Pro has a 200K token context window.
Go deeper on either model
Per-call cost calculators, provider lineups, and price history for both models on this page.
Other comparisons
How Claude Sonnet 5 and o3 Pro stack up against the rest of the field.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.