DeepSeek V4.1 Flash
deepseek/deepseek-v4.1-flashDeepSeek V4.1 Flash is the smallest model in DeepSeek's V4.1 architecture family, released in September 2026 with native visual understanding. It is a 552B-parameter mixture-of-experts model using a Causal Encoder-Decoder design that activates 8B parameters for input and 16B for output, with a KV cache about a quarter the size of the previous Flash generation. DeepSeek positions it for agentic coding and long-context work and reports it ahead of V4 Pro, replacing V4 Flash and V4 Flash Vision Exp on its API.
- Input price
- $0.22
$0.30USD / 1M tokens - Output price
- $0.90
$1.20USD / 1M tokens - Cache read
- $0.0045
$0.006USD / 1M tokens - Context window
- 1M
- Max output
- 384K
Specifications
- Input
- Text, image
- Output
- Text
Try the model
Playground
Write a prompt to try this model. Usage is billed at the prices shown.
Try a prompt
Add an image (optional)
Your response will appear here
Choose an example or write a prompt, then click Run.
Start building
Send your first request
OpenAI-compatible endpoint with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/chat/completions" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "deepseek/deepseek-v4.1-flash",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Questions
FAQ
How do I call DeepSeek V4.1 Flash through SandBase?
Create a SandBase API key, then send requests with the model ID "deepseek/deepseek-v4.1-flash" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.
How much does DeepSeek V4.1 Flash cost?
$0.22 per 1M input tokens and $0.90 per 1M output tokens with the current 25% discount (list price $0.30 / $1.20), billed per request from your SandBase balance.
What is the context window of DeepSeek V4.1 Flash?
1M tokens of context, with up to 384K output tokens per response.
Which features does DeepSeek V4.1 Flash support?
DeepSeek V4.1 Flash supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.
Do I need a separate DeepSeek account?
No. One SandBase API key and balance gives you access to DeepSeek V4.1 Flash and the other models in the catalog; you do not need to sign up with DeepSeek separately.