tokevenClaudevsGPT
Claude Opus 4.5 vs GPT 5.1
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Opus 4.5
FlagshipGPT 5.1
Mid-tierInput $/MTok
$5.00
$1.25
Output $/MTok
$25.00
$10.00
Cache discount
90% off
90% off
Context
200K
272K
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 4.5
GPT 5.1
Guidance
When to use Claude Opus 4.5 vs GPT 5.1
Choose Claude Opus 4.5 when...
- Similar performance; consider provider preference or ecosystem fit.
Choose GPT 5.1 when...
- -Cost matters: 75% cheaper on input tokens
- -You need a larger context window (272K vs 200K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Opus 4.5
GPT 5.1
100K tokens
$1.10
$0.39Cheaper
1M tokens
$11.00
$3.88Cheaper
10M tokens
$110.00
$38.75Cheaper
FAQ
When should I use Claude Opus 4.5 instead of GPT 5.1?
Claude Opus 4.5 and GPT 5.1 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.1 cheaper than Claude Opus 4.5?
Yes. GPT 5.1 input costs $1.25/MTok vs $5.00/MTok for Claude Opus 4.5, saving 75% on input.
What are the context window sizes for Claude Opus 4.5 and GPT 5.1?
Claude Opus 4.5 has a 200K token context window. GPT 5.1 has a 272K 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 4.5 and GPT 5.1 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.