DeepSeek
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash is a DeepSeek model with 1M context, $0.30 in / $1.20 out per million tokens, last verified September 26, 2026. Open weights: yes. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.
DeepSeek V4.1 Flash is DeepSeek's new default — an open-weight (MIT) multimodal MoE that DeepSeek says beats V4-Pro on performance, cost and speed.
Catalog record checked September 26, 2026Individual provider fields may change
| Specification | DeepSeek V4.1 Flash |
|---|---|
| Provider | DeepSeek |
| Tier | Balanced |
| Context window | 1M |
| Max output | 384K |
| Input / 1M tokens | $0.30 |
| Output / 1M tokens | $1.20 |
| Weights | Open |
| Parameters | 552B MoE (causal encoder-decoder; 8B active for input, 16B for output) |
| Reasoning levels | low, high, max |
| Modalities | text, image |
| License | MIT |
| API model id | deepseek-flash |
| Released | September 10, 2026 |
Pricing tiers: Official peak rates $0.30/$1.20 per MTok; off-peak $0.15/$0.60 (50% of peak). Cache hit $0.006 peak / $0.003 off-peak. Peak hours are weekdays 01:00–04:00 and 06:00–10:00 UTC. Open weights (MIT). The legacy deepseek-v4-flash and deepseek-v4-flash-vision-exp ids temporarily route here.
Verified evidence
Published benchmark results
Each result keeps its source and measurement date visible. A missing benchmark is not treated as a zero.
| Benchmark | Score | Measured | Source |
|---|---|---|---|
| Artificial Analysis Intelligence Index [max] | 39.5 | 2026-09-26 | Artificial Analysis · View source |
| DeepSWE 1.1 [max] | 74.2 | 2026-09-10 | DeepSeek V4.1-Flash release notes (vendor; not yet on Datacurve's board) · View source |
| Terminal-Bench 2.1 [max] | 90.6 | 2026-09-10 | DeepSeek V4.1-Flash release notes (vendor) · View source |
| GPQA Diamond [max] | 90.9 | 2026-09-10 | DeepSeek V4.1-Flash release notes (vendor) · View source |
Best for
- Open-weight price-performance
- High-volume hosted agents
- Self-hosting with MIT weights
Watch out
History
DeepSeek V4.1 Flash timeline
Release and status events for this model that passed two-source verification — dated, sourced, and linked.
- DeepSeek V4.1-FlashReleaseSeptember 10, 2026
DeepSeek releases V4.1-Flash (MIT weights, 1M context, image input) as its new default at $0.30/$1.20 per MTok peak ($0.15/$0.60 off-peak) under the API id `deepseek-flash`, and says it beats V4-Pro on performance, cost and speed.
DeepSeek — V4.1-Flash release notes
Source receipts
Catalog figures for this model were checked against the following sources.
- DeepSeek — V4.1-Flash release (2026-09-10) (accessed 2026-09-26)
- DeepSeek API pricing (deepseek-flash $0.30/$1.20 peak) (accessed 2026-09-26)
- Hugging Face — deepseek-ai/DeepSeek-V4.1-Flash (accessed 2026-09-26)
Common questions
DeepSeek V4.1 Flash
Answered from the verified figures on this page rather than general guidance.
How much does DeepSeek V4.1 Flash cost per million tokens?
What is DeepSeek V4.1 Flash's context window?
What is DeepSeek V4.1 Flash best for?
Can I self-host DeepSeek V4.1 Flash?
Compare it
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