tokevenClaudevsGPT
Claude Sonnet 4.5 vs GPT 5.5
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Sonnet 4.5
Mid-tierGPT 5.5
FlagshipInput $/MTok
$3.00
$5.00
Output $/MTok
$15.00
$30.00
Cache discount
90% off
90% off
Context
200K
1,050K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
0
vs
91
Code Review
0
vs
90
Summarization
0
vs
89
Q&A
0
vs
90
Extraction
0
vs
87
Reasoning
0
vs
95
Classification
0
vs
85
Creative Writing
0
vs
91
Claude Sonnet 4.5
GPT 5.5
Guidance
When to use Claude Sonnet 4.5 vs GPT 5.5
Choose Claude Sonnet 4.5 when...
- -Cost matters: 40% cheaper on input tokens
Choose GPT 5.5 when...
- -You need a larger context window (1,050K vs 200K)
- 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 4.5
GPT 5.5
100K tokens
$0.66Cheaper
$1.25
1M tokens
$6.60Cheaper
$20.50
10M tokens
$66.00Cheaper
$205.00
FAQ
When should I use Claude Sonnet 4.5 instead of GPT 5.5?
Claude Sonnet 4.5 and GPT 5.5 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.5 cheaper than Claude Sonnet 4.5?
GPT 5.5 input costs $5.00/MTok, which is 67% more than Claude Sonnet 4.5 at $3.00/MTok.
What are the context window sizes for Claude Sonnet 4.5 and GPT 5.5?
Claude Sonnet 4.5 has a 200K token context window. GPT 5.5 has a 1,050K 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 4.5 and GPT 5.5 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.