DeepSeekPaidOperational

DeepSeek V3.1 Terminus

API model name: deepseek-v3.1-terminus

DeepSeek V3.1 Terminus is DeepSeek's chat model, served on the Api.Airforce unified API. Capabilities include Reasoning. It is priced at $1.74 per million input tokens and $5.22 per million output tokens. Access it through the OpenAI-compatible API with one key, alongside 100+ other models on Api.Airforce.

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Pricing

Input / 1M tokens

$1.74

Output / 1M tokens

$5.22

Cache read / 1M tokens

$0.36

Specifications

Provider: DeepSeek
Type: chat model

Capabilities

Reasoning

Benchmarks

Independent evaluations and measured speed from Artificial Analysis.

Intelligence Index

21.4/100

Math Index

53.7/100

MMLU-Pro84%

GPQA Diamond75%

Humanity's Last Exam8%

LiveCodeBench53%

AIME 202554%

Source: Benchmark data by Artificial Analysis (artificialanalysis.ai)

What is DeepSeek V3.1 Terminus used for?

Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.
Complex reasoning — math, coding and step-by-step problem solving.

DeepSeek V3.1 Terminus vs. similar models

Model	Intelligence	Context	Input / 1M	Output / 1M
DeepSeek V3.1 Terminus	21.4	—	$1.74	$5.22
DeepSeek	—	—	$0.63	$0.96
DeepSeek R1	20.1	64K	$0.87	$3.42
DeepSeek R1	20.1	—	$0.87	$3.42

Prices are Api.Airforce pay-as-you-go rates per 1M tokens. Context is the maximum input length.

Related models

DeepSeekDeepSeek · $0.63 / 1M DeepSeek R1DeepSeek · $0.87 / 1M DeepSeek R1DeepSeek · $0.87 / 1M DeepSeek ReasonerDeepSeek · $0.72 / 1M DeepSeek V3DeepSeek · $0.18 / 1M DeepSeek V3.1DeepSeek · $0.87 / 1M DeepSeek V3.2DeepSeek · $0.19 / 1M DeepSeek V4 FlashDeepSeek · $0.12 / 1M DeepSeek V4 ProDeepSeek · $0.41 / 1M GPT 5 NanoOpenAI · $0.03 / 1M GPT 5.1OpenAI · $0.27 / 1M GPT 5.1 ChatOpenAI · $0.27 / 1M

DeepSeek V3.1 Terminus — frequently asked questions

How much does DeepSeek V3.1 Terminus cost?: DeepSeek V3.1 Terminus is billed pay-as-you-go at $1.74 per 1M input tokens and $5.22 per 1M output tokens. There is no subscription — you only pay for what you use.
What can DeepSeek V3.1 Terminus do?: DeepSeek V3.1 Terminus supports Reasoning.
Is DeepSeek V3.1 Terminus free to use?: DeepSeek V3.1 Terminus is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
How do I use DeepSeek V3.1 Terminus via the API?: DeepSeek V3.1 Terminus is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID deepseek-v3.1-terminus with your Api.Airforce API key.
Who makes DeepSeek V3.1 Terminus?: DeepSeek V3.1 Terminus is DeepSeek's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

All models·Quickstart·Chat API reference

Use DeepSeek V3.1 Terminus via the API

OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass deepseek-v3.1-terminus as the model.

cURL

curl https://api.airforce/v1/chat/completions \
  -H "Authorization: Bearer $AIRFORCE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek-v3.1-terminus",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Python

from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
    model="deepseek-v3.1-terminus",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://api.airforce/v1", apiKey: process.env.AIRFORCE_API_KEY });
const r = await client.chat.completions.create({
  model: "deepseek-v3.1-terminus",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);