tokevenClaudevsGPT
Claude Opus 5.5 vs GPT 5 Pro
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Opus 5.5
FlagshipGPT 5 Pro
FlagshipInput $/MTok
$4.00
$15.00
Output $/MTok
$20.00
$120.00
Cache discount
95% off
0% off
Context
1,000K
400K
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
GPT 5 Pro
Guidance
When to use Claude Opus 5.5 vs GPT 5 Pro
Choose Claude Opus 5.5 when...
- -Cost matters: 73% cheaper on input tokens
- -You need a larger context window (1,000K vs 400K)
Choose GPT 5 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 Opus 5.5
GPT 5 Pro
100K tokens
$0.88Cheaper
$4.65
1M tokens
$8.80Cheaper
$46.50
10M tokens
$88.00Cheaper
$465.00
FAQ
When should I use Claude Opus 5.5 instead of GPT 5 Pro?
Claude Opus 5.5 and GPT 5 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5 Pro cheaper than Claude Opus 5.5?
GPT 5 Pro input costs $15.00/MTok, which is 275% more than Claude Opus 5.5 at $4.00/MTok.
What are the context window sizes for Claude Opus 5.5 and GPT 5 Pro?
Claude Opus 5.5 has a 1,000K token context window. GPT 5 Pro has a 400K 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 GPT 5 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.