tokevenClaudevsGPT
Claude Opus 5.5 vs o1 Pro
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Opus 5.5
Flagshipo1 Pro
FlagshipInput $/MTok
$4.00
$150.00
Output $/MTok
$20.00
$600.00
Cache discount
95% off
0% 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
o1 Pro
Guidance
When to use Claude Opus 5.5 vs o1 Pro
Choose Claude Opus 5.5 when...
- -Cost matters: 97% cheaper on input tokens
- -You need a larger context window (1,000K vs 200K)
Choose o1 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
o1 Pro
100K tokens
$0.88Cheaper
$28.50
1M tokens
$8.80Cheaper
$285.00
10M tokens
$88.00Cheaper
$2850.00
FAQ
When should I use Claude Opus 5.5 instead of o1 Pro?
Claude Opus 5.5 and o1 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o1 Pro cheaper than Claude Opus 5.5?
o1 Pro input costs $150.00/MTok, which is 3650% more than Claude Opus 5.5 at $4.00/MTok.
What are the context window sizes for Claude Opus 5.5 and o1 Pro?
Claude Opus 5.5 has a 1,000K token context window. o1 Pro 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 o1 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.