Head-to-head comparison
Claude Sonnet 5 vs. Claude Mythos 5
Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.
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Specifications and cost
General specifications and standard API pricing
Undisclosed parameter counts and knowledge cutoffs stay marked as unavailable. The table shows direct standard token pricing, including documented context tiers. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.
| Attribute | Claude Sonnet 5 | Claude Mythos 5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Released | Jun 30, 2026 | Jun 9, 2026 |
| Availability | Active | Limited access |
| Model type | Proprietary | Proprietary |
| Parameters | Not published | Not published |
| Architecture | Not published | Not published |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Knowledge cutoff | January 2026 | January 2026 |
| Technical sources | Model, Context | Model, Context, Knowledge cutoff |
| API pricing per 1M tokens | ||
| API input | $2 | $10 |
| API output | $10 | $50 |
| Cache read | $0.2 | $1 |
| Cache write (5 min.) | $2.5 | $12.5 |
| Cache write (1 hr.) | $4 | $20 |
| Price verified | 08/11/2026Source | 07/30/2026Source |
Performance
Shared benchmarks
Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.
No directly comparable result series yet
No published benchmark for Claude Sonnet 5 and Claude Mythos 5 currently matches in version, task, metric, and comparison cohort. We therefore show no estimated or blended values.
How to read this comparison
Winning one benchmark is not an overall verdict
Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.
Prices use official API rates per 1M tokens. Web subscriptions and cloud platform surcharges can differ.
Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.
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