tokevenClaudevsGPT
Claude Mythos 5 vs GPT 5.5 Pro
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 Pro
FlagshipInput $/MTok
$10.00
$30.00
Output $/MTok
$50.00
$180.00
Cache discount
90% off
0% 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
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 5.5 Pro
Guidance
When to use Claude Mythos 5 vs GPT 5.5 Pro
Choose Claude Mythos 5 when...
- -Cost matters: 67% cheaper on input tokens
Choose GPT 5.5 Pro when...
- -You need a larger context window (1,050K vs 1,000K)
- 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 Mythos 5
GPT 5.5 Pro
100K tokens
$2.20Cheaper
$7.50
1M tokens
$22.00Cheaper
$123.00
10M tokens
$220.00Cheaper
$1230.00
FAQ
When should I use Claude Mythos 5 instead of GPT 5.5 Pro?
Claude Mythos 5 and GPT 5.5 Pro perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is GPT 5.5 Pro cheaper than Claude Mythos 5?
GPT 5.5 Pro input costs $30.00/MTok, which is 200% more than Claude Mythos 5 at $10.00/MTok.
What are the context window sizes for Claude Mythos 5 and GPT 5.5 Pro?
Claude Mythos 5 has a 1,000K token context window. GPT 5.5 Pro 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 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.