tokevenClaudevsClaude
Claude Opus 5.5 vs Claude Sonnet 4.5
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Opus 5.5
FlagshipClaude Sonnet 4.5
Mid-tierInput $/MTok
$4.00
$3.00
Output $/MTok
$20.00
$15.00
Cache discount
95% off
90% 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 5.5
Claude Sonnet 4.5
Guidance
When to use Claude Opus 5.5 vs Claude Sonnet 4.5
Choose Claude Opus 5.5 when...
- -You need a larger context window (1,000K vs 200K)
- Similar performance; consider provider preference or ecosystem fit.
Choose Claude Sonnet 4.5 when...
- -Cost matters: 25% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Opus 5.5
Claude Sonnet 4.5
100K tokens
$0.88
$0.66Cheaper
1M tokens
$8.80
$6.60Cheaper
10M tokens
$88.00
$66.00Cheaper
FAQ
When should I use Claude Opus 5.5 instead of Claude Sonnet 4.5?
Claude Opus 5.5 and Claude Sonnet 4.5 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Claude Sonnet 4.5 cheaper than Claude Opus 5.5?
Yes. Claude Sonnet 4.5 input costs $3.00/MTok vs $4.00/MTok for Claude Opus 5.5, saving 25% on input.
What are the context window sizes for Claude Opus 5.5 and Claude Sonnet 4.5?
Claude Opus 5.5 has a 1,000K token context window. Claude Sonnet 4.5 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 5.5 and Claude Sonnet 4.5 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.