tokevenClaudevsGPT
Claude Fable 5.1 vs GPT 5.5
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Fable 5.1
FlagshipGPT 5.5
FlagshipInput $/MTok
$10.00
$5.00
Output $/MTok
$50.00
$30.00
Cache discount
98% off
90% off
Context
1M
1.1M
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
74
vs
65
Code Review
0
vs
90
Summarization
71
vs
70
Q&A
0
vs
90
Extraction
75
vs
78
Reasoning
92
vs
90
Classification
0
vs
85
Creative Writing
78
vs
73
Claude Fable 5.1
GPT 5.5
Guidance
When to use Claude Fable 5.1 vs GPT 5.5
Choose Claude Fable 5.1 when...
- -You need strong reasoning (confidence 92 vs 90)
- -You need strong creative writing (confidence 78 vs 73)
- -You need strong code generation (confidence 74 vs 65)
- -You need strong summarization (confidence 71 vs 70)
Choose GPT 5.5 when...
- -You need strong extraction (confidence 78 vs 75)
- -Cost matters: 50% cheaper on input tokens
- -You need a larger context window (1.1M vs 1M)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Fable 5.1
GPT 5.5
100K tokens
$2.20
$1.25Cheaper
1M tokens
$22.00
$20.50Cheaper
10M tokens
$220.00
$205.00Cheaper
FAQ
When should I use Claude Fable 5.1 instead of GPT 5.5?
Claude Fable 5.1 outperforms GPT 5.5 for Code Generation, Summarization, Reasoning. It costs $10.00/$50.00 per million tokens (input/output).
Is GPT 5.5 cheaper than Claude Fable 5.1?
Yes. GPT 5.5 input costs $5.00/MTok vs $10.00/MTok for Claude Fable 5.1, saving 50% on input.
What are the context window sizes for Claude Fable 5.1 and GPT 5.5?
Claude Fable 5.1 has a 1M token context window. GPT 5.5 has a 1.1M 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 Fable 5.1 and GPT 5.5 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.