# DeepSeek V4.1 Flash

> DeepSeek V4.1 Flash is an open-weight language model from DeepSeek, released on 10 Sept 2026. It accepts text and images and generates text, with a 1M-token context window and up to 393K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.15 per million input tokens and $0.60 per million output tokens (DeepSeek API), across 10 providers we track.

Source page: https://www.aimodel.directory/models/deepseek-v4-1-flash
Last verified: 4 Oct 2026

## Specifications

- **Developer:** DeepSeek
- **Release date:** 10 Sept 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Weights:** Open weights (source: Hugging Face, https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash)
- **License:** mit (source: Hugging Face, https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash)
- **Parameters:** 763B (source: Hugging Face, https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash)
- **Context window:** 1M (1,000,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Max output:** 393K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Knowledge cutoff:** May 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Input:** Text and images (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/deepseek/models/deepseek-flash.toml)
- **Hugging Face:** deepseek-ai/DeepSeek-V4.1-Flash (source: Hugging Face, https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| NVIDIA NIM | Free | Free | – | 1M |
| OpenRouter | $0.003 | $2.40 | $0.003 | 1M |
| DeepSeek API | $0.15 | $0.60 | $0.003 | 1M |
| DeepInfra | $0.20 | $0.60 | $0.006 | 1M |
| Baseten | $0.30 | $1.20 | $0.03 | 1M |
| Nebius AI Studio | $0.30 | $1.20 | $0.30 | 1M |
| Fireworks AI | $0.30 | $1.20 | $0.006 | 1M |
| Together AI | $0.30 | $1.20 | $0.006 | 1M |
| Hugging Face Inference Providers | $0.30 | $1.20 | – | 1M |
| Fireworks AI | $0.30 | $1.20 | $0.006 | 1M |
| Vercel AI Gateway | $0.30 | $1.20 | $0.007 | 1M |
| Vercel AI Gateway | $0.30 | $1.20 | $0.006 | 1M |
| Baseten | $0.60 | $2.40 | – | 1M |

## FAQ

### What is the context window of DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash has a context window of 1,000,000 tokens (1M) and can generate up to 393,216 tokens in a single response, according to models.dev.

### How much does the DeepSeek V4.1 Flash API cost?

Through DeepSeek API, DeepSeek V4.1 Flash costs $0.15 per million input tokens and $0.60 per million output tokens. Prices last verified 4 Oct 2026.

### Is DeepSeek V4.1 Flash open source?

DeepSeek V4.1 Flash is an open-weight model: its weights are published on Hugging Face as deepseek-ai/DeepSeek-V4.1-Flash under the mit license. Check the license terms before commercial use.

### When was DeepSeek V4.1 Flash released?

DeepSeek released DeepSeek V4.1 Flash on 10 Sept 2026, according to models.dev.

### Which providers offer DeepSeek V4.1 Flash?

We track DeepSeek V4.1 Flash on 10 providers: NVIDIA NIM, OpenRouter, DeepSeek API, DeepInfra, Baseten, Nebius AI Studio, Fireworks AI, Together AI, Hugging Face Inference Providers, Vercel AI Gateway.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "DeepSeek V4.1 Flash", https://www.aimodel.directory/models/deepseek-v4-1-flash