tokevenClaudevsGPT
Claude Mythos 5 vs GPT 5.1
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Mythos 5
FlagshipGPT 5.1
Mid-tierInput $/MTok
$10.00
$1.25
Output $/MTok
$50.00
$10.00
Cache discount
90% off
90% off
Context
1,000K
272K
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
GPT 5.1
Guidance
When to use Claude Mythos 5 vs GPT 5.1
Choose Claude Mythos 5 when...
- -You need a larger context window (1,000K vs 272K)
- Similar performance; consider provider preference or ecosystem fit.
Choose GPT 5.1 when...
- -Cost matters: 88% 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
GPT 5.1
100K tokens
$2.20
$0.39Cheaper
1M tokens
$22.00
$3.88Cheaper
10M tokens
$220.00
$38.75Cheaper
FAQ
When should I use Claude Mythos 5 instead of GPT 5.1?
Claude Mythos 5 and GPT 5.1 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.1 cheaper than Claude Mythos 5?
Yes. GPT 5.1 input costs $1.25/MTok vs $10.00/MTok for Claude Mythos 5, saving 88% on input.
What are the context window sizes for Claude Mythos 5 and GPT 5.1?
Claude Mythos 5 has a 1,000K token context window. GPT 5.1 has a 272K 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 and GPT 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.