DeepSeek V4.1 Flash
by DeepSeek · deepseek/deepseek-v4.1-flash · #101 cheapest of 422 paid models
Prices updated Sep 20, 2026, 12:34 AM UTC · refreshed hourly
DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture. It activates 8B parameters on input and 16B on...
Compare vs:Claude Sonnet 5Claude Opus 4.6Claude Haiku 4.5GPT-5.6 Sol
Pricing
Input
$0.15
per 1M tokens
Output
$0.60
per 1M tokens
Blended (3:1)
$0.262
3 input : 1 output
Cache read
$0.0030
per 1M cached tokens
Cache write
—
per 1M tokens
Cache & batch economics
Effective prices for DeepSeek V4.1 Flash with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $0.262 | $0.0159 | — |
| 50% | $0.207 | $0.00855 | −46% |
| 90% | $0.163 | $0.00267 | −83% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates (available for OpenAI / Anthropic / Google — not flagged for this creator). Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.000255 | $0.255 |
| Document summary | 8,000 | 1,000 | $0.0018 | $1.80 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.0057 | $5.70 |
| Long-context analysis | 150,000 | 5,000 | $0.0255 | $25.50 |
Performance
Intelligence Index
39.5
AA composite quality
Coding Index
—
Math Index
—
Agentic Index
—
Output speed
225 tok/s
median
Time to first token
0.82s
median
Time to first answer
9.70s
after reasoning tokens
Artificial Analysis benchmarks
| Benchmark | Score |
|---|---|
| Humanity's Last Exam | 39.2% |
| SciCode | 51.9% |
| AA-LCR (Long Context Reasoning) | 84.0% |
Specs
Context window
1.05M
tokens
Max output
384K
tokens
Input modalities
text, image
Tokenizer
DeepSeek