DeepSeek V4.1 Flash 1017
An open-weight multimodal MoE model from DeepSeek with a 1M-token context, built for agentic coding, long-document work, and vision tasks.
DeepSeek V4.1 Flash 1017 is a dated snapshot in DeepSeek's V4.1 Flash series, released on October 17, 2026 under the MIT license. It is a causal encoder-decoder mixture-of-experts model with 552B backbone parameters, activating 8B parameters per input token and 16B per output token, published in FP8 with safetensors shards. It accepts text and images and generates text.
The model targets reasoning, coding, agent workflows, and image-to-text tasks. It handles agentic programming such as terminal operations and multi-step task completion, long-document processing through its 1M-token context window, visual understanding with image input, and creative coding like game development and 3D modeling. Tool calling, multi-turn dialogue, thinking mode, and interleaved image content are supported.
Compared with its predecessor, this revision improves benchmark results across nearly all categories while shortening task execution time and output length, aiming at a better cost-performance tradeoff. The API model name deepseek-flash and the calling method are unchanged, so existing integrations can adopt it without code changes.
Updated:
MODEL ID
deepseek-v4.1-flash-1017- Context
- 1.049M
- Max output
- 393.216K
- Recommended API
- messages
- Input
- text / image
- Output
- text
Providers
2 providersCompare API prices across providers. Select a provider to view all charges and conditions.
| $0.3 | $1.2 | $0.007 | |
| $0.049 | $0.375 | $0.001176 |
Reasoning
- Default effort
- high
- Enabled by default
- Yes
- Always enabled
- No
- Available effort levels
- max / high / low / none
Quick Start
Drop-in code to call this model with Felo API Platform compatible APIs. Start in the Playground when you want to test prompts before writing code.
Get your API key
Create a key from your Felo API Platform account and set it as an environment variable.
export FELO_API_KEY="YOUR_API_KEY"Make your first request
Use this model ID with the Felo API Platform endpoint. Optional request headers such as X-Request-Id can help troubleshooting.
deepseek-v4.1-flash-1017This model is reasoning-capable. If your selected protocol and model route expose reasoning controls, preserve the returned reasoning metadata when continuing a conversation.
const response = await fetch("https://openapi.felo.ai/api/v1/messages", {
method: 'POST',
headers: {
Authorization: `Bearer ${process.env.FELO_API_KEY}`,
'Content-Type': 'application/json',
},
body: JSON.stringify({
"model": "deepseek-v4.1-flash-1017",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "Hello"
}
]
}),
});
if (!response.ok) throw new Error(await response.text());
console.log(await response.json());Using third-party SDKs
Use compatible SDKs by setting baseURL to https://openapi.felo.ai/api/v1. Use the Anthropic-compatible base URL for Claude-style clients. https://openapi.felo.ai/api.
Enable streaming
Add stream: true to receive responses as server-sent events.
curl -N https://openapi.felo.ai/api/v1/messages \
-H "Authorization: Bearer $FELO_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "deepseek-v4.1-flash-1017",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"stream": true
}'Endpoint
Felo API Platform exposes compatible model-calling surfaces. Pick the surface your app or agent client already supports.
Messages
Anthropic-compatible messages for Claude-style clients.
POST
https://openapi.felo.ai/api/v1/messagesParameters
modelstringdeepseek-v4.1-flash-1017Public model ID to call.max_tokensinteger—Maximum generated tokens.messagesarray—Conversation messages for Chat Completions.frequency_penalty———include_reasoning———logit_bias———logprobs———max_completion_tokens———min_p———parallel_tool_calls———presence_penalty———reasoning———reasoning_effort———repetition_penalty———response_formatobject—Request structured output when supported.seed———stop———structured_outputs———temperaturenumber—Controls response variety when supported.tool_choicestring or object—Controls whether a tool should be called.toolsarray—Tool calling definitions following compatible schema.top_k———top_logprobs———top_p———Frequently asked questions
What is DeepSeek V4.1 Flash 1017?
DeepSeek V4.1 Flash 1017 is a dated snapshot in DeepSeek's V4.1 Flash series, released on October 17, 2026 under the MIT license. It is a causal encoder-decoder mixture-of-experts model with 552B backbone parameters, activating 8B parameters per input token and 16B per output token, published in FP8 with safetensors shards. It accepts text and images and generates text. The model targets reasoning, coding, agent workflows, and image-to-text tasks. It handles agentic programming such as terminal operations and multi-step task completion, long-document processing through its 1M-token context window, visual understanding with image input, and creative coding like game development and 3D modeling. Tool calling, multi-turn dialogue, thinking mode, and interleaved image content are supported. Compared with its predecessor, this revision improves benchmark results across nearly all categories while shortening task execution time and output length, aiming at a better cost-performance tradeoff. The API model name deepseek-flash and the calling method are unchanged, so existing integrations can adopt it without code changes.
How is usage billed?
Your bill depends on the provider you use, its prices and your usage. Longer inputs or other conditions may have different prices.
