tokevenClaudevsGPT
Claude Sonnet 5 vs o3
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Sonnet 5
Mid-tiero3
Mid-tierInput $/MTok
$2.00
$2.00
Output $/MTok
$10.00
$8.00
Cache discount
90% off
75% 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
Guidance
When to use Claude Sonnet 5 vs o3
Choose Claude Sonnet 5 when...
- -You need a larger context window (1,000K vs 200K)
- Similar performance; consider provider preference or ecosystem fit.
Choose o3 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
100K tokens
$0.44
$0.38Cheaper
1M tokens
$4.40
$3.80Cheaper
10M tokens
$44.00
$38.00Cheaper
FAQ
When should I use Claude Sonnet 5 instead of o3?
Claude Sonnet 5 and o3 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o3 cheaper than Claude Sonnet 5?
Both models have the same input pricing at $2.00/MTok. Compare output pricing: $10.00 vs $8.00/MTok.
What are the context window sizes for Claude Sonnet 5 and o3?
Claude Sonnet 5 has a 1,000K token context window. o3 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 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.