tokevenClaudevsClaude
Claude Opus 4.8 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 Opus 4.8
FlagshipClaude Fable 5.1
FlagshipInput $/MTok
$5.00
$10.00
Output $/MTok
$25.00
$50.00
Cache discount
90% off
98% off
Context
1M
1M
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
63
vs
74
Code Review
94
vs
0
Summarization
69
vs
71
Q&A
85
vs
0
Extraction
73
vs
75
Reasoning
89
vs
92
Classification
80
vs
0
Creative Writing
81
vs
78
Claude Opus 4.8
Claude Fable 5.1
Guidance
When to use Claude Opus 4.8 vs Claude Fable 5.1
Choose Claude Opus 4.8 when...
- -You need strong creative writing (confidence 81 vs 78)
- -Cost matters: 50% cheaper on input tokens
Choose Claude Fable 5.1 when...
- -You need strong reasoning (confidence 92 vs 89)
- -You need strong extraction (confidence 75 vs 73)
- -You need strong code generation (confidence 74 vs 63)
- -You need strong summarization (confidence 71 vs 69)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Opus 4.8
Claude Fable 5.1
100K tokens
$1.10Cheaper
$2.20
1M tokens
$11.00Cheaper
$22.00
10M tokens
$110.00Cheaper
$220.00
FAQ
When should I use Claude Opus 4.8 instead of Claude Fable 5.1?
Claude Opus 4.8 outperforms Claude Fable 5.1 for Creative Writing. It costs $5.00/$25.00 per million tokens (input/output).
Is Claude Fable 5.1 cheaper than Claude Opus 4.8?
Claude Fable 5.1 input costs $10.00/MTok, which is 100% more than Claude Opus 4.8 at $5.00/MTok.
What are the context window sizes for Claude Opus 4.8 and Claude Fable 5.1?
Claude Opus 4.8 has a 1M token context window. Claude Fable 5.1 has a 1M 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 4.8 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.