DeepSeek-V4.1-Flash
Canonical page on the main site: sinoaihub.com/models/deepseek-v4-1-flash
Type
model
Definition
DeepSeek-V4.1-Flash is a DeepSeek model in the DeepSeek-V4.1 family: 552B-parameter MoE; Causal Encoder-Decoder; 8B active parameters on input, 16B on output; 1,048,576-token context window; 393,216 max output; open-weight; MIT license; released 2026-09-10.
Key facts
- Architecture: 552B-parameter MoE; Causal Encoder-Decoder; 8B active parameters on input, 16B on output
- Context window: 1,048,576 tokens (max output 393,216)
- Weights: open; MIT license
- API pricing: $0.15 input / $0.6 output per 1M tokens (USD)
- Released: 2026-09-10
- Capabilities: reasoning, coding, vision, tool calling
Provider
Model Family
DeepSeek-V4.1
Release Date
2026-09-10
Release History
| date | event | source | verification_date |
|---|---|---|---|
| 2026-09-10 | V4.1-Flash released — 552B MoE (8B/16B active), multimodal, MIT weights; V4-Flash and V4-Flash-Vision-Exp retired | https://www.deepseek.com/en/news/deepseek-v4-1-flash/ | 2026-09-20 |
Status
active
Architecture
552B-parameter MoE; Causal Encoder-Decoder; 8B active parameters on input, 16B on output
Parameter Information
- total_parameters: 552B
- active_parameters: 8B (input) / 16B (output)
Context Window
1048576
Maximum Output
393216
Capabilities
- reasoning: Yes
- coding: Yes
- vision: Yes
- tool_calling: Yes
- function_calling: Yes
- structured_output: Yes
Open Weight
Yes
License
MIT
Self Hosting
Yes
Api Available
Yes
Pricing
- input_price_per_1m: 0.15
- output_price_per_1m: 0.6
- currency: USD
- pricing_ref: deepseek
Official Api
Yes
Cloud Providers
- DeepSeek Platform
Regions
- unknown
Benchmark Results
| benchmark | score | metric | date | source_type | source_url |
|---|---|---|---|---|---|
| GPQA Diamond | 90.9 | accuracy | 2026-09-10 | vendor_reported | https://api-docs.deepseek.com/updates |
| HLE | 36.8 | accuracy | 2026-09-10 | vendor_reported | https://api-docs.deepseek.com/updates |
| Codeforces | 3471 | rating | 2026-09-10 | vendor_reported | https://api-docs.deepseek.com/updates |
| Terminal-Bench 2.1 | 90.6 | accuracy | 2026-09-10 | vendor_reported | https://api-docs.deepseek.com/updates |
| DeepSWE v1.1 | 74.2 | accuracy | 2026-09-10 | vendor_reported | https://api-docs.deepseek.com/updates |
Related Agents
Related Technologies
Known Limitations
- Pricing is peak/off-peak: listed prices are off-peak; peak (01:00-04:00 and 06:00-10:00 UTC, Mon-Fri) is 2x
- Benchmarks are vendor-reported using DeepSeek Harness (minimal mode, max effort); not independently verified
- HLE score is on the pure-text subset (39.1 on that subset; 36.8 full)
- Legacy API names deepseek-v4-flash and deepseek-v4-flash-vision-exp route to V4.1-Flash
Verification Status
verified
License Changes
No documented license changes on record as of 2026-09-29.
Last Verified
2026-09-20
Sources
| evidence_id | source_name | source_url | source_type | published | verified | confidence | conflict |
|---|---|---|---|---|---|---|---|
| src-models-deepseek-v4-1-flash-1 | DeepSeek API docs — Models & Pricing | https://api-docs.deepseek.com/quick_start/pricing | Official documentation | — | 2026-09-20 | high | — |
| src-models-deepseek-v4-1-flash-2 | DeepSeek API Change Log | https://api-docs.deepseek.com/updates | Official documentation | — | 2026-09-20 | high | — |
| src-models-deepseek-v4-1-flash-3 | DeepSeek-V4.1-Flash release announcement | https://www.deepseek.com/en/news/deepseek-v4-1-flash/ | Official | 2026-09-10 | 2026-09-20 | high | — |
| src-models-deepseek-v4-1-flash-4 | Hugging Face model card — DeepSeek-V4.1-Flash | https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash | Model card | — | 2026-09-20 | high | — |