tokevenClaudevsGPT
Claude Fable 5.1 vs GPT 5.6 Luna
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Fable 5.1
FlagshipGPT 5.6 Luna
Fast / BudgetInput $/MTok
$10.00
$0.20
Output $/MTok
$50.00
$1.20
Cache discount
98% off
90% off
Context
1M
922K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
74
vs
62
Code Review
0
vs
68
Summarization
71
vs
57
Q&A
0
vs
85
Extraction
75
vs
74
Reasoning
92
vs
86
Classification
0
vs
91
Creative Writing
78
vs
69
Claude Fable 5.1
GPT 5.6 Luna
Guidance
When to use Claude Fable 5.1 vs GPT 5.6 Luna
Choose Claude Fable 5.1 when...
- -You need strong reasoning (confidence 92 vs 86)
- -You need strong creative writing (confidence 78 vs 69)
- -You need strong extraction (confidence 75 vs 74)
- -You need strong code generation (confidence 74 vs 62)
- -You need a larger context window (1M vs 922K)
Choose GPT 5.6 Luna 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 5.6 Luna
100K tokens
$2.20
$0.05Cheaper
1M tokens
$22.00
$0.82Cheaper
10M tokens
$220.00
$8.20Cheaper
FAQ
When should I use Claude Fable 5.1 instead of GPT 5.6 Luna?
Claude Fable 5.1 outperforms GPT 5.6 Luna for Code Generation, Summarization, Extraction. It costs $10.00/$50.00 per million tokens (input/output).
Is GPT 5.6 Luna cheaper than Claude Fable 5.1?
Yes. GPT 5.6 Luna 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 5.6 Luna?
Claude Fable 5.1 has a 1M token context window. GPT 5.6 Luna has a 922K 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 5.6 Luna 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.