Model comparison
Claude Sonnet 5 vs DeepSeek V4.1 Flash
Compare Claude Sonnet 5 vs DeepSeek V4.1 Flash API pricing: input/output token costs, cache pricing, context windows, workload estimates, and routing fit.
Claude Sonnet 5
anthropic · claude-sonnet-5
- Input
- $2
- Output
- $10
- 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 Sonnet 5 has the larger context window at 1M tokens.
Choose Claude Sonnet 5 if...
- Claude Sonnet 5 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 Sonnet 5 | DeepSeek V4.1 Flash | Cheaper |
|---|---|---|---|
| 1M input + 200K output | $4.00 | $0.54 | DeepSeek V4.1 Flash |
| 10M input + 2M output | $40.00 | $5.40 | DeepSeek V4.1 Flash |
| 100M input + 20M output | $400.00 | $54.00 | DeepSeek V4.1 Flash |
Context, output, and capability fit
Claude Sonnet 5 provides the larger context window. Check max output separately when the task needs long reports, code generation, or full-document rewrites.
- Claude Sonnet 5 max output
- 128K
- DeepSeek V4.1 Flash max output
- 384K
- Claude Sonnet 5 features
- prompt caching, function calling, vision
- DeepSeek V4.1 Flash features
- prompt caching, function calling, vision
Risk notes for Claude Sonnet 5
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.
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
frontierreasoningcodingagentsenterprise-raglong-contextmultimodalcache-friendlyragbudgethigh-volume