> ## Documentation Index
> Fetch the complete documentation index at: https://mixroute.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# DeepSeek V4.1 Flash 1017

> The October 17 revision of DeepSeek V4.1 Flash, with stronger end-to-end project development and native visual understanding.

The October 17 revision of DeepSeek V4.1 Flash, with stronger end-to-end project development and native visual understanding.

## Model Information

| Field | Description |
| - | - |
| `model` | deepseek-v4.1-flash-1017 |
| `context` | 1M tokens |
| `max output` | 384K tokens |
| `endpoint` | POST /v1/chat/completions |

Context and output sizes describe the model specification. Effective request limits, availability, and billing depend on the MixRoute route.

## Capabilities and Usage

* Improves end-to-end project development, including coding and agent workflows, while reducing task runtime and output length compared with the preceding revision.
* Use this exact MixRoute model ID to select the 1017 revision. Do not assume `deepseek-v4.1-flash` or `deepseek-flash` resolves to the same revision on every route.
* Supports thinking and non-thinking modes. `thinking.type` accepts `enabled` or `disabled`. `reasoning_effort` accepts `none` to disable thinking, or `low`, `high`, and `max` to enable it; the default effort is `high`.

## Request Example

Set `MIXROUTE_API_KEY` before making the request.

```bash theme={null}
curl --request POST "https://api.mixroute.ai/v1/chat/completions" \
  --header "Authorization: Bearer $MIXROUTE_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "deepseek-v4.1-flash-1017",
  "messages": [
    {
      "role": "user",
      "content": "Explain when a database index improves query performance."
    }
  ],
  "thinking": {
    "type": "disabled"
  },
  "max_tokens": 1024
}'
```

## Request Fields

| Field | Description |
| - | - |
| `model` | Required. Use the exact model ID above. |
| `messages` | Required conversation messages with `role` and `content`. |
| `thinking` | Optional. `{"type":"enabled"}` or `{"type":"disabled"}`; default: `enabled`. |
| `reasoning_effort` | Optional. `none`, `low`, `high`, or `max`; default: `high`. Do not combine conflicting thinking settings. |
| `max_tokens` | Optional output-token budget, up to 393216 tokens (384K), subject to the context window and route limits. |
| `stream` | Optional. Set to `true` for streaming responses. |

Complete request format: [Chat Completions](/docs/api-reference/endpoint/chat-openai).


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