DeepSeek V4.1 Flash API
DeepSeek V4.1 Flash is the current cost-efficient V4.1 model. DeepSeek's release notes describe a 552B-parameter MoE with 8B input and 16B output activation, native multimodal input, a substantially smaller KV cache, and released open weights.
Official source: model page · verified 2026-10-22
Pricing
Prices can change with upstream providers; the rate at settlement is authoritative.
Call the API
Use the OpenAI-compatible endpoint; no model-specific SDK setup is required.
curl https://api.kimiseek.app/v1/chat/completions \
-H "Authorization: Bearer $KIMISEEK_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "deepseek-v4.1-flash",
"messages": [{"role": "user", "content": "Hello from KimiSeek"}]
}'Where it fits
Best for
- Cost-sensitive agent and coding workloads
- Long-context document and repository tasks
- Teams that need a current DeepSeek model at lower token rates
Tradeoffs
- Not the capacity-first V4 Pro option
- For maximum output depth, compare V4 Pro before moving a workflow over
Model details
FAQ
Is V4.1 Flash open source?
DeepSeek publishes model weight links for V4.1 Flash. Review the current Hugging Face or ModelScope licence before redistribution or commercial self-hosting.
What changed from the 260910 snapshot?
The 1017 release is the newer V4.1 Flash. The dated 260910 snapshot is no longer part of the active KimiSeek catalog.
How do I call this model?
Use KimiSeek's OpenAI-compatible API and set the model field to deepseek-v4.1-flash with your KimiSeek API key.