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DeepSeek V4.1 Flash vs DeepSeek V4 Pro
A straight cost comparison of DeepSeek V4.1 Flash (DeepSeek) and DeepSeek V4 Pro (DeepSeek), per 1,000,000 tokens, verified October 2026.
Rate-by-rate comparison
| Metric | DeepSeek V4.1 Flash | DeepSeek V4 Pro | Winner |
|---|---|---|---|
| Input / 1M | $0.30 | $1.32 | DeepSeek V4.1 Flash |
| Cached input / 1M | $0.006 | $0.044 | DeepSeek V4.1 Flash |
| Cache write / 1M | — | — | Tie |
| Output / 1M | $1.20 | $3.96 | DeepSeek V4.1 Flash |
| Context window | 1,100,000 | 1,000,000 | DeepSeek V4.1 Flash |
| Batch API | No | No | Tie |
| Long-context tier | None | None | — |
For per-token metrics, the lower number wins. For context window and batch support, the higher or broader option wins. A dash means the provider does not publish that rate: a missing cache-write fee means writes are not billed per token, while a missing cached-input rate means cache hits bill at the full input rate.
Blended cost: 1M input + 250K output
| Model | Blended cost | Difference |
|---|---|---|
| DeepSeek V4.1 Flash | $0.60 | Cheaper |
| DeepSeek V4 Pro | $2.31 | +$1.71 |
Three workloads, two bills
| Workload | DeepSeek V4.1 Flash | DeepSeek V4 Pro | Winner |
|---|---|---|---|
| Support chat 1,000 requests · 4K input / 600 output | $1.92 | $7.66 | DeepSeek V4.1 Flash |
| RAG with caching 1,000 requests · 50K input (45K cached) / 1K output | $2.98 | $12.60 | DeepSeek V4.1 Flash |
| Nightly batch job 10,000 requests · 10K input / 2K output | $54 | $211 | DeepSeek V4.1 Flash |
Which one should you pick?
DeepSeek V4.1 Flash wins on support chat, cached RAG, nightly batch job, while DeepSeek V4 Pro wins on none of the three workloads above.
Beyond price, the two differ on input rate ($0.30 vs $1.32); output rate ($1.20 vs $3.96); cached-input rate ($0.006 vs $0.044); context window (1,100,000 vs 1,000,000).
Neither model offers a batch tier, so schedule heavy jobs for off-peak hours where the provider supports it. Both publish cached-input discounts, so a stable system prompt is worth caching on either.
FAQ
Is DeepSeek V4.1 Flash cheaper than DeepSeek V4 Pro?
On a blended 1M-input-plus-250K-output workload, DeepSeek V4.1 Flash is cheaper by 74% ($0.60 vs $2.31). The gap changes for cache-heavy prompts and for batch jobs, as the workload table shows.
Which handles longer prompts, DeepSeek V4.1 Flash or DeepSeek V4 Pro?
DeepSeek V4.1 Flash has the larger context window (1,100,000 vs 1,000,000 tokens). Neither model publishes a long-context surcharge.
Do both models support prompt caching?
DeepSeek V4.1 Flash bills cached reads at $0.006 per 1M; DeepSeek V4 Pro at $0.044.