tokevenClaudevsGPT
Claude Mythos 5.1 vs o3
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Mythos 5.1
Flagshipo3
Mid-tierInput $/MTok
$10.00
$2.00
Output $/MTok
$50.00
$8.00
Cache discount
98% off
75% 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 Mythos 5.1
o3
Guidance
When to use Claude Mythos 5.1 vs o3
Choose Claude Mythos 5.1 when...
- -You need a larger context window (1,000K vs 200K)
- Similar performance; consider provider preference or ecosystem fit.
Choose o3 when...
- -Cost matters: 80% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Mythos 5.1
o3
100K tokens
$2.20
$0.38Cheaper
1M tokens
$22.00
$3.80Cheaper
10M tokens
$220.00
$38.00Cheaper
FAQ
When should I use Claude Mythos 5.1 instead of o3?
Claude Mythos 5.1 and o3 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is o3 cheaper than Claude Mythos 5.1?
Yes. o3 input costs $2.00/MTok vs $10.00/MTok for Claude Mythos 5.1, saving 80% on input.
What are the context window sizes for Claude Mythos 5.1 and o3?
Claude Mythos 5.1 has a 1,000K token context window. o3 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 Mythos 5.1 and o3 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.