tokevenClaudevsGPT
Claude Opus 4.5 vs GPT 5 Nano
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 Nano
Fast / BudgetInput $/MTok
$5.00
$0.05
Output $/MTok
$25.00
$0.40
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 Nano
Guidance
When to use Claude Opus 4.5 vs GPT 5 Nano
Choose Claude Opus 4.5 when...
- Similar performance; consider provider preference or ecosystem fit.
Choose GPT 5 Nano when...
- -Cost matters: 99% 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 Nano
100K tokens
$1.10
$0.02Cheaper
1M tokens
$11.00
$0.15Cheaper
10M tokens
$110.00
$1.55Cheaper
FAQ
When should I use Claude Opus 4.5 instead of GPT 5 Nano?
Claude Opus 4.5 and GPT 5 Nano perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5 Nano cheaper than Claude Opus 4.5?
Yes. GPT 5 Nano input costs $0.05/MTok vs $5.00/MTok for Claude Opus 4.5, saving 99% on input.
What are the context window sizes for Claude Opus 4.5 and GPT 5 Nano?
Claude Opus 4.5 has a 200K token context window. GPT 5 Nano 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 Nano 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.