tokevenClaudevsClaude
Claude Sonnet 5 vs Claude Fable 5.1
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Sonnet 5
Mid-tierClaude Fable 5.1
FlagshipInput $/MTok
$2.00
$10.00
Output $/MTok
$10.00
$50.00
Cache discount
90% off
98% off
Context
200K
1,000K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
93
vs
0
Code Review
96
vs
0
Summarization
91
vs
0
Q&A
89
vs
0
Extraction
88
vs
0
Reasoning
90
vs
0
Classification
86
vs
0
Creative Writing
87
vs
0
Claude Sonnet 5
Claude Fable 5.1
Guidance
When to use Claude Sonnet 5 vs Claude Fable 5.1
Choose Claude Sonnet 5 when...
- -Cost matters: 80% cheaper on input tokens
Choose Claude Fable 5.1 when...
- -You need a larger context window (1,000K vs 200K)
- 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 Sonnet 5
Claude Fable 5.1
100K tokens
$0.44Cheaper
$2.20
1M tokens
$4.40Cheaper
$22.00
10M tokens
$44.00Cheaper
$220.00
FAQ
When should I use Claude Sonnet 5 instead of Claude Fable 5.1?
Claude Sonnet 5 and Claude Fable 5.1 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Claude Fable 5.1 cheaper than Claude Sonnet 5?
Claude Fable 5.1 input costs $10.00/MTok, which is 400% more than Claude Sonnet 5 at $2.00/MTok.
What are the context window sizes for Claude Sonnet 5 and Claude Fable 5.1?
Claude Sonnet 5 has a 200K token context window. Claude Fable 5.1 has a 1,000K 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 Sonnet 5 and Claude Fable 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.