tokevenClaudevsGPT
Claude Mythos 5 vs GPT 5.5
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Mythos 5
FlagshipGPT 5.5
FlagshipInput $/MTok
$10.00
$5.00
Output $/MTok
$50.00
$30.00
Cache discount
90% off
90% off
Context
1,000K
1,050K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
0
vs
91
Code Review
0
vs
90
Summarization
0
vs
89
Q&A
0
vs
90
Extraction
0
vs
87
Reasoning
0
vs
95
Classification
0
vs
85
Creative Writing
0
vs
91
Claude Mythos 5
GPT 5.5
Guidance
When to use Claude Mythos 5 vs GPT 5.5
Choose Claude Mythos 5 when...
- Similar performance; consider provider preference or ecosystem fit.
Choose GPT 5.5 when...
- -Cost matters: 50% cheaper on input tokens
- -You need a larger context window (1,050K vs 1,000K)
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Mythos 5
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 Mythos 5 instead of GPT 5.5?
Claude Mythos 5 and GPT 5.5 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.5 cheaper than Claude Mythos 5?
Yes. GPT 5.5 input costs $5.00/MTok vs $10.00/MTok for Claude Mythos 5, saving 50% on input.
What are the context window sizes for Claude Mythos 5 and GPT 5.5?
Claude Mythos 5 has a 1,000K token context window. GPT 5.5 has a 1,050K 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 5.5 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.