DeepSeek V4 Flash is $1.15 cheaper per 1M input tokens (92% lower; 12.5x difference).
API cost decision in 10 seconds
🔥DeepSeek V4 Flash vs Grok 4.20
Pick DeepSeek V4 Flash for lower cost; pick Grok 4.20 only if the larger context window matters more.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick DeepSeek V4 Flash for lower cost; pick Grok 4.20 only if the larger context window matters more.
On the standard 1M input plus 500K output workload, DeepSeek V4 Flash is estimated at $0.2 vs $2.5 for Grok 4.20, saving $2.3 (92% lower).
Cost-first pickDeepSeek V4 Flash
Context-first pickGrok 4.20
Sample savings$2.392%
10x traffic gap$23
Grok 4.20 has more context, but DeepSeek V4 Flash saves $2.3 on the standard workload. At 10x that traffic, the same price gap is about $23. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
DeepSeek V4 Flash stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | DeepSeek V4 Flash | Grok 4.20 |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | DeepSeek V4 Flash | $0.6 | $7.5 |
| Balanced workload | 1M input + 1M output | DeepSeek V4 Flash | $0.3 | $3.75 |
| Output-heavy chatbot | 1M input + 5M output | DeepSeek V4 Flash | $1.1 | $13.75 |
DeepSeek V4 Flash is $2.3 cheaper per 1M output tokens (92% lower; 12.5x difference).
Grok 4.20 has 951.42K more context (1.91x larger).
DeepSeek V4 Flash is $2.3 cheaper on the standard workload (92% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
DeepSeek V4 Flash has the lower input price; DeepSeek V4 Flash has the lower output price; Grok 4.20 offers the larger context window. For the 1M input plus 500K output sample, DeepSeek V4 Flash is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $0.2 for DeepSeek V4 Flash and $2.5 for Grok 4.20.
Choose DeepSeek V4 Flash when you care most about lower input-token price, and lower output-token price.
Choose Grok 4.20 when you care most about larger context window.
- On the standard 1M input plus 500K output workload, DeepSeek V4 Flash is estimated at $0.2 vs $2.5 for Grok 4.20, saving $2.3 (92% lower).
- DeepSeek V4 Flash is $2.3 cheaper on the standard workload (92% lower).
- DeepSeek V4 Flash is $1.15 cheaper per 1M input tokens (92% lower; 12.5x difference).
- DeepSeek V4 Flash is $2.3 cheaper per 1M output tokens (92% lower; 12.5x difference).
- Grok 4.20 has 951.42K more context (1.91x larger).
| Feature | 🔥DeepSeek V4 Flash (DeepSeek) | Grok 4.20 (xAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.1 | $1.25 |
| Completion Price per 1M tokens | $0.2 | $2.5 |
| Sample Workload Cost 1M input + 500K output | $0.2 | $2.5 |
| Context Window | 1.05M | 2M |
| Release Date | ||
| Popularity | #1 |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | DeepSeek V4 Flash | On the standard 1M input plus 500K output workload, DeepSeek V4 Flash is estimated at $0.2 vs $2.5 for Grok 4.20, saving $2.3 (92% lower). |
| High-volume input processing | DeepSeek V4 Flash | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | DeepSeek V4 Flash | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Grok 4.20 | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- DeepSeek V4 Flash (free) can replace DeepSeek V4 Flash when lower sample workload cost matters most: $0.
- Grok Build 0.1 can replace Grok 4.20 when lower sample workload cost matters most: $2.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Hy3 preview · Tencent · #2
- Claude Opus 4.7 · Anthropic · #3
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Open xAI modelsDeepSeek V4 Flash is an efficiency-optimized Mixture-of-Experts model from DeepSeek with 284B total parameters and 13B activated parameters, supporting a 1M-token context window. It is designed for fast inference and...
Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...