tokevenClaude Mythos 5.1 vs Claude Sonnet 4.5
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Mythos 5.1
FlagshipClaude Sonnet 4.5
Mid-tierQuality
Task confidence comparison
Guidance
When to use Claude Mythos 5.1 vs Claude Sonnet 4.5
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 Claude Sonnet 4.5 when...
- -Cost matters: 70% cheaper on input tokens
At scale
Cost at scale
FAQ
When should I use Claude Mythos 5.1 instead of Claude Sonnet 4.5?
Claude Mythos 5.1 and Claude Sonnet 4.5 perform similarly across all tracked tasks. Pick based on pricing and provider preference.
Is Claude Sonnet 4.5 cheaper than Claude Mythos 5.1?
Yes. Claude Sonnet 4.5 input costs $3.00/MTok vs $10.00/MTok for Claude Mythos 5.1, saving 70% on input.
What are the context window sizes for Claude Mythos 5.1 and Claude Sonnet 4.5?
Claude Mythos 5.1 has a 1,000K token context window. Claude Sonnet 4.5 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 Claude Sonnet 4.5 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.