DeepSeek V4.1 Flash (1017)
deepseek-v4.1-flash-1017AvailableDeepSeek's V4.1 Flash, October 17 release. Fast, low-cost long-context model for coding, agents, and tool use.
Specs and pricing
| Model ID | deepseek-v4.1-flash-1017 |
|---|---|
| Context | 1,048,576 tokens |
| Max output | 8,192 tokens |
| Default output | 1,024 tokens |
| Input price | $0.15 per 1M tokens |
| Cached input price | $0.005 per 1M tokens |
| Output price | $0.57 per 1M tokens |
| API compatibility | OpenAI Chat Completions, OpenAI Responses, Anthropic Messages |
| Tool calling | Yes |
| JSON response format | Yes |
Quickstart
Set REDROUTER_API_KEY to a key from API Keys.
- Base URL
https://redrouter.org/v1- Model ID
deepseek-v4.1-flash-1017
curl 'https://redrouter.org/v1/chat/completions' \
-H "Authorization: Bearer $REDROUTER_API_KEY" \
-H 'Content-Type: application/json' \
-d '{"messages":[{"content":"Hello","role":"user"}],"model":"deepseek-v4.1-flash-1017"}'curl -N 'https://redrouter.org/v1/chat/completions' \
-H "Authorization: Bearer $REDROUTER_API_KEY" \
-H 'Content-Type: application/json' \
-d '{"messages":[{"content":"Hello","role":"user"}],"model":"deepseek-v4.1-flash-1017","stream":true,"stream_options":{"include_usage":true}}'import os
from openai import OpenAI
client = OpenAI(
base_url="https://redrouter.org/v1",
api_key=os.environ["REDROUTER_API_KEY"],
)
response = client.chat.completions.create(
model="deepseek-v4.1-flash-1017",
messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://redrouter.org/v1",
apiKey: process.env.REDROUTER_API_KEY,
});
const response = await client.chat.completions.create({
model: "deepseek-v4.1-flash-1017",
messages: [{ role: "user", content: "Hello" }],
});
console.log(response.choices[0].message.content);Supported parameters
Other parameters are rejected with HTTP 400. The user field is accepted for compatibility and is not forwarded.
modelmessagesstreamstream_optionsmax_tokensmax_completion_tokenstemperaturetop_pstoppresence_penaltyfrequency_penaltyseedtoolstool_choiceparallel_tool_callsresponse_formatuserreasoning_effortreasoningenable_thinkingthinkingthinking_budgetchat_template_kwargsoutput_config
Deployment
- Routing
- Your request runs on the model you named. RedRouter does not substitute a different model.
Model version
As reported by the hosting provider. RedRouter has not independently verified the served weights.
- Weights
- deepseek-ai/DeepSeek-V4.1-Flash-1017 ↗
- Revision
- Not disclosed by host
- License
- Not disclosed by host
- Quantization
- MXFP4
- Tokenizer
- Not disclosed by host
- Chat template
- Not disclosed by host