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Claude Opus 5 vs o3 Mini
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Opus 5
Flagshipo3 Mini
Fast / BudgetInput $/MTok
$5.00
$1.10
Output $/MTok
$25.00
$4.40
Cache discount
90% off
50% 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
0
vs
0
Code Review
0
vs
0
Summarization
0
vs
0
Q&A
0
vs
0
Extraction
0
vs
0
Reasoning
0
vs
0
Classification
0
vs
0
Creative Writing
0
vs
0
Claude Opus 5
o3 Mini
Guidance
When to use Claude Opus 5 vs o3 Mini
Choose Claude Opus 5 when...
- -You need a larger context window (1,000K vs 200K)
- Similar performance; consider provider preference or ecosystem fit.
Choose o3 Mini when...
- -Cost matters: 78% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Opus 5
o3 Mini
100K tokens
$1.10
$0.21Cheaper
1M tokens
$11.00
$2.09Cheaper
10M tokens
$110.00
$20.90Cheaper
FAQ
When should I use Claude Opus 5 instead of o3 Mini?
Claude Opus 5 and o3 Mini perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o3 Mini cheaper than Claude Opus 5?
Yes. o3 Mini input costs $1.10/MTok vs $5.00/MTok for Claude Opus 5, saving 78% on input.
What are the context window sizes for Claude Opus 5 and o3 Mini?
Claude Opus 5 has a 1,000K token context window. o3 Mini 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 Opus 5 and o3 Mini 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.