tokevenClaudevsGPT
Claude Fable 5.1 vs GPT 5 Pro
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 Pro
FlagshipInput $/MTok
$10.00
$15.00
Output $/MTok
$50.00
$120.00
Cache discount
98% off
0% off
Context
1,000K
400K
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 Pro
Guidance
When to use Claude Fable 5.1 vs GPT 5 Pro
Choose Claude Fable 5.1 when...
- -Cost matters: 33% cheaper on input tokens
- -You need a larger context window (1,000K vs 400K)
Choose GPT 5 Pro when...
- 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 Fable 5.1
GPT 5 Pro
100K tokens
$2.20Cheaper
$4.65
1M tokens
$22.00Cheaper
$46.50
10M tokens
$220.00Cheaper
$465.00
FAQ
When should I use Claude Fable 5.1 instead of GPT 5 Pro?
Claude Fable 5.1 and GPT 5 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5 Pro cheaper than Claude Fable 5.1?
GPT 5 Pro input costs $15.00/MTok, which is 50% more than Claude Fable 5.1 at $10.00/MTok.
What are the context window sizes for Claude Fable 5.1 and GPT 5 Pro?
Claude Fable 5.1 has a 1,000K token context window. GPT 5 Pro has a 400K 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 Pro 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.