Model comparison
Claude Mythos 5.1 vs DeepSeek V4.1 Flash
Compare Claude Mythos 5.1 vs DeepSeek V4.1 Flash API pricing: input/output token costs, cache pricing, context windows, workload estimates, and routing fit.
Claude Mythos 5.1
anthropic · claude-mythos-5-1
- Input
- $10
- Output
- $50
- Context
- 1M
DeepSeek V4.1 Flash
deepseek · deepseek-flash
- Input
- $0.3
- Output
- $1.2
- Context
- 1M
Quick take
DeepSeek V4.1 Flash has the lower input price at $0.3 per 1M input tokens. DeepSeek V4.1 Flash is cheaper for the example blended workload below. Claude Mythos 5.1 has the larger context window at 1M tokens.
Choose Claude Mythos 5.1 if...
- Claude Mythos 5.1 is a reasonable pick when its provider, latency, or integration path fits your stack better.
Choose DeepSeek V4.1 Flash if...
- DeepSeek V4.1 Flash is the better default for cost-sensitive traffic and repeated high-volume calls.
- DeepSeek V4.1 Flash gives more room for long generated answers, reports, or code output.
Example workload cost
Estimates use input tokens plus 20% output tokens. They exclude provider discounts, cache hits, and tool/search surcharges.
| Workload | Claude Mythos 5.1 | DeepSeek V4.1 Flash | Cheaper |
|---|---|---|---|
| 1M input + 200K output | $20.00 | $0.54 | DeepSeek V4.1 Flash |
| 10M input + 2M output | $200.00 | $5.40 | DeepSeek V4.1 Flash |
| 100M input + 20M output | $2,000.00 | $54.00 | DeepSeek V4.1 Flash |
Context, output, and capability fit
Claude Mythos 5.1 provides the larger context window. Check max output separately when the task needs long reports, code generation, or full-document rewrites.
- Claude Mythos 5.1 max output
- 128K
- DeepSeek V4.1 Flash max output
- 384K
- Claude Mythos 5.1 features
- prompt caching, function calling, vision
- DeepSeek V4.1 Flash features
- prompt caching, function calling, vision
Risk notes for Claude Mythos 5.1
- High output price: cap max tokens for verbose generation workloads.
Risk notes for DeepSeek V4.1 Flash
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.
Routing tags
frontierpremiumreasoningcodingagentslong-contextmultimodalcache-friendlymythos-classlimited-availabilityragbudgethigh-volume