Model comparison
DeepSeek V4 Flash vs Grok 4.20 Reasoning
Compare DeepSeek V4 Flash vs Grok 4.20 Reasoning API pricing: input/output token costs, cache pricing, context windows, workload estimates, and routing fit.
DeepSeek V4 Flash
deepseek · deepseek-v4-flash
- Input
- $0.14
- Output
- $0.28
- Context
- 1M
Grok 4.20 Reasoning
xai · grok-4.20-0309-reasoning
- Input
- $1.25
- Output
- $2.5
- Context
- 1M
Quick take
DeepSeek V4 Flash has the lower input price at $0.14 per 1M input tokens. DeepSeek V4 Flash is cheaper for the example blended workload below. DeepSeek V4 Flash has the larger context window at 1M tokens.
Choose DeepSeek V4 Flash if...
- DeepSeek V4 Flash is the better default for cost-sensitive traffic and repeated high-volume calls.
- DeepSeek V4 Flash gives more room for long generated answers, reports, or code output.
Choose Grok 4.20 Reasoning if...
- Grok 4.20 Reasoning is a reasonable pick when its provider, latency, or integration path fits your stack better.
Example workload cost
Estimates use input tokens plus 20% output tokens. They exclude provider discounts, cache hits, and tool/search surcharges.
| Workload | DeepSeek V4 Flash | Grok 4.20 Reasoning | Cheaper |
|---|---|---|---|
| 1M input + 200K output | $0.20 | $1.75 | DeepSeek V4 Flash |
| 10M input + 2M output | $1.96 | $17.50 | DeepSeek V4 Flash |
| 100M input + 20M output | $19.60 | $175.00 | DeepSeek V4 Flash |
Context, output, and capability fit
DeepSeek V4 Flash provides the larger context window. Check max output separately when the task needs long reports, code generation, or full-document rewrites.
- DeepSeek V4 Flash max output
- 384K
- Grok 4.20 Reasoning max output
- n/a
- DeepSeek V4 Flash features
- prompt caching, function calling
- Grok 4.20 Reasoning features
- prompt caching, function calling
Risk notes for DeepSeek V4 Flash
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.
Risk notes for Grok 4.20 Reasoning
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.
Routing tags
budgethigh-volumecodingreasoningopen-weightlong-contextcache-friendlyraglocal-openfrontieragentsmultimodal