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DeepSeek V3.1

DeepSeekOpen-weight

33K context · 671B params · DeepSeek License

deepseek/deepseek-chat-v3-1

DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. It extends the DeepSeek-V3 base with a two-phase long-context...

Cheapest blended: ¥0.3 / 1M tokens on DeepSeekGet custom quote

Reachability & verification

Live reachability

Probing…

Target (DeepSeek): https://api.deepseek.com/v1

Live reachability probe

Measured in real time from the ModelHub gateway egress to this model's API endpoint. Green means reachable right now. Overseas reference latencies are estimates; the live probe is the proof of current reachability.

Pricing across providers

1

Prices are shown in each provider's billing currency — ¥ (CNY) for Chinese providers, $ (USD) for overseas gateways.

ProviderInput /1MOutput /1MBlendedCtxp50 latencyAPIVerified
DeepSeekdeepseek-chat-v3.1¥0.15¥0.75¥0.333K OAI119d ago

Works with

CursorClineAiderContinueOpenCodeOpen WebUI

Any OpenAI-compatible client works — point the base URL at the provider endpoint.

Capabilities

chatreasoningcodemathtool_use

Languages: en, zh

Code samples

Python
from openai import OpenAI

client = OpenAI(
    base_url="https://api.deepseek.com/v1",
    api_key="YOUR_API_KEY",
)

resp = client.chat.completions.create(
    model="deepseek-chat-v3.1",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)
cURL
curl https://api.deepseek.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek-chat-v3.1",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
Node.js
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.deepseek.com/v1",
  apiKey: "YOUR_API_KEY",
});

const resp = await client.chat.completions.create({
  model: "deepseek-chat-v3.1",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(resp.choices[0].message.content);

Technical specs

Context

33K

Max output

7K

Parameters

671B

Release

Training cutoff

License

DeepSeek License

Similar models

Frequently asked questions

How much does DeepSeek V3.1 cost?

The cheapest tracked blended price is ¥0.3 per 1M tokens on DeepSeek. See the pricing matrix above for input/output splits per provider.

Can I use DeepSeek V3.1 from outside China?

Availability depends on the hosting provider. Use our Path Planner on the DeepSeek page to map a verified official-vs-brokered access path, including payment and KYC constraints.

Is DeepSeek V3.1 open source?

Yes — DeepSeek V3.1 is open-weight under the DeepSeek License license. You can self-host it or use any listed inference provider.

Is DeepSeek V3.1 OpenAI-compatible?

Yes — at least one tracked provider exposes an OpenAI-compatible endpoint, so Cursor, Cline, Aider and similar clients work with just a base-URL change.

What is the maximum context window?

DeepSeek V3.1 supports up to 33K tokens of context with a maximum output of 7K tokens.

Need verified access to DeepSeek V3.1?

We broker vetted intros to DeepSeek — payment, KYC and endpoint verification handled.

Request a brokerage intro