tokevenClaudevsGPT
Claude Fable 5.1 vs GPT 5.4 Nano
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Fable 5.1
FlagshipGPT 5.4 Nano
Fast / BudgetInput $/MTok
$10.00
$0.20
Output $/MTok
$50.00
$1.25
Cache discount
98% off
90% off
Context
1,000K
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 Fable 5.1
GPT 5.4 Nano
Guidance
When to use Claude Fable 5.1 vs GPT 5.4 Nano
Choose Claude Fable 5.1 when...
- -You need a larger context window (1,000K vs 272K)
- Similar performance; consider provider preference or ecosystem fit.
Choose GPT 5.4 Nano when...
- -Cost matters: 98% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Fable 5.1
GPT 5.4 Nano
100K tokens
$2.20
$0.05Cheaper
1M tokens
$22.00
$0.52Cheaper
10M tokens
$220.00
$5.15Cheaper
FAQ
When should I use Claude Fable 5.1 instead of GPT 5.4 Nano?
Claude Fable 5.1 and GPT 5.4 Nano perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.4 Nano cheaper than Claude Fable 5.1?
Yes. GPT 5.4 Nano input costs $0.20/MTok vs $10.00/MTok for Claude Fable 5.1, saving 98% on input.
What are the context window sizes for Claude Fable 5.1 and GPT 5.4 Nano?
Claude Fable 5.1 has a 1,000K token context window. GPT 5.4 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 Fable 5.1 and GPT 5.4 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.