# DeepSeek V4.1 Flash 1017

DeepSeek V4.1 Flash 1017 is the October 17, 2026 snapshot of DeepSeek V4.1 Flash, a sparse mixture-of-experts model with native image understanding and a compressed KV cache. It is the cost-efficient tier of the V4.1 family, tuned over the previous Flash snapshot for coding, terminal and long-horizon agent work. Its published context window is 1,048,576 tokens. The advertised input rate is $0.30 per million input tokens. The advertised output rate is $1.20 per million output tokens.

- Model identifier: ` deepseek/deepseek-v4.1-flash-1017 `
- Creator: DeepSeek
- Providers: DeepSeek, Fireworks
- Model type: Text generation
- Canonical model page: [DeepSeek V4.1 Flash 1017](<https://impossibl.com/deepseek/deepseek-v4.1-flash-1017>)
- API availability: Listed as serving through Impossibl.
- Creator release date: 2026-10-17

## Providers

Different companies host DeepSeek V4.1 Flash 1017. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

| Provider | Endpoint location | Routes | Verified context window | Tool calling |
| --- | --- | --- | --- | --- |
| DeepSeek | Not specified | 1 | Not verified | Not verified |
| Fireworks | Not specified | 1 | 1,048,576 tokens | Not verified |

The model price applies whichever provider serves the request. Endpoint locations do not guarantee inference residency.

## Specs and Capabilities

- Context window: 1,048,576 tokens
- Maximum output tokens: Not published in the public catalog; this is separate from the context window.
- Inputs: text, image
- Outputs: text
- Tool calling: Not published

## API access

Use ` deepseek/deepseek-v4.1-flash-1017 ` as the model identifier through the Impossibl API.

Published API endpoints:

- ` /v1/chat/completions `

[API quickstart](<https://impossibl.com/docs/agent-quickstart>) · [Models and billing documentation](<https://impossibl.com/docs/models>)

## Published API prices

All rates are in USD. An unpublished rate is unknown, not zero. Workspace-specific pricing, taxes, balance-purchase fees, billing adjustments, and tool charges can affect the amount paid.

| Usage | Published base rate | Billing unit |
| --- | --- | --- |
| Input | $0.30 | per million input tokens |
| Output | $1.20 | per million output tokens |
| Cache read | $0.006 | per million cached input tokens |
| Cache write (default retention) | Not published | per million tokens |
| Cache write (one-hour retention) | Not published | per million tokens |
| Audio input | Not published | per million audio input tokens |

## Availability and retirement

The model is listed as serving. No retirement is announced in the current public catalog.

## Frequently asked questions

### What is DeepSeek V4.1 Flash 1017?

DeepSeek V4.1 Flash 1017 is the October 17, 2026 snapshot of DeepSeek V4.1 Flash, a sparse mixture-of-experts model with native image understanding and a compressed KV cache. It is the cost-efficient tier of the V4.1 family, tuned over the previous Flash snapshot for coding, terminal and long-horizon agent work.

Sources: [DeepSeek release announcement](<https://api-docs.deepseek.com/news/news261017/>); [OpenRouter: DeepSeek V4.1 Flash 1017](<https://openrouter.ai/deepseek/deepseek-v4.1-flash-1017>); [Hugging Face: DeepSeek-V4.1-Flash-1017](<https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash-1017>)

### How much does DeepSeek V4.1 Flash 1017 cost?

DeepSeek V4.1 Flash 1017 costs $0.30 per million input tokens and $1.20 per million output tokens through the Impossibl API. Cache reads cost $0.006 per million tokens. All rates are in USD.

### What is the context length of DeepSeek V4.1 Flash 1017?

DeepSeek V4.1 Flash 1017 has a 1,048,576-token context window through the Impossibl API.

### What inputs and outputs does DeepSeek V4.1 Flash 1017 support?

DeepSeek V4.1 Flash 1017 accepts text and image as input. DeepSeek V4.1 Flash 1017 returns text.

### How do I use DeepSeek V4.1 Flash 1017 through an API?

DeepSeek V4.1 Flash 1017 is available through the Impossibl API. Use deepseek/deepseek-v4.1-flash-1017 as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

### When was DeepSeek V4.1 Flash 1017 released?

DeepSeek released DeepSeek V4.1 Flash 1017 on October 17, 2026.

Sources: [Creator release announcement](<https://api-docs.deepseek.com/news/news261017/>)

## Sources and related links

Prices, limits, capabilities, endpoints, and availability come from the public Impossibl catalog. Creator documentation supplies descriptions and release dates where available; it does not override the published API offering.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [DeepSeek V4.1 Flash 1017: model details and pricing](<https://impossibl.com/deepseek/deepseek-v4.1-flash-1017>)
- [Model directory](<https://impossibl.com/models>)
- [DeepSeek release announcement](<https://api-docs.deepseek.com/news/news261017/>)
- [OpenRouter: DeepSeek V4.1 Flash 1017](<https://openrouter.ai/deepseek/deepseek-v4.1-flash-1017>)
- [Hugging Face: DeepSeek-V4.1-Flash-1017](<https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash-1017>)