tokevenClaudevsGPT
Claude Fable 5.1 vs o3 Pro
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Fable 5.1
Flagshipo3 Pro
FlagshipInput $/MTok
$10.00
$20.00
Output $/MTok
$50.00
$80.00
Cache discount
98% off
0% off
Context
1,000K
200K
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
o3 Pro
Guidance
When to use Claude Fable 5.1 vs o3 Pro
Choose Claude Fable 5.1 when...
- -Cost matters: 50% cheaper on input tokens
- -You need a larger context window (1,000K vs 200K)
Choose o3 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
o3 Pro
100K tokens
$2.20Cheaper
$3.80
1M tokens
$22.00Cheaper
$38.00
10M tokens
$220.00Cheaper
$380.00
FAQ
When should I use Claude Fable 5.1 instead of o3 Pro?
Claude Fable 5.1 and o3 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o3 Pro cheaper than Claude Fable 5.1?
o3 Pro input costs $20.00/MTok, which is 100% more than Claude Fable 5.1 at $10.00/MTok.
What are the context window sizes for Claude Fable 5.1 and o3 Pro?
Claude Fable 5.1 has a 1,000K token context window. o3 Pro has a 200K 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 o3 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.