DeepSeekText Generation/v1/ai/chat

DeepSeek V4 Pro API

Access DeepSeek V4 Pro through one API key. Frontier reasoning at a fraction of flagship pricing.

DeepSeek's V4-generation flagship: 1.6T-parameter MoE with 49B activated, 1M token context, built for advanced reasoning, coding, and agentic workflows.

Full Docs Get API Key — Free $5 Credit

No credit card required. Takes 30 seconds.

DeepSeek V4 Pro API pricing

Pay per request from your YepAPI balance — no subscription, no monthly minimum. Prices updated October 23, 2026.

Token type	Price
Input	$1.41 / 1M tokens
Output	$2.82 / 1M tokens
Context window	1.0M tokens

What it costs	Per job	Per 1,000
Chat reply1K input + 500 output tokens	$0.0028	$2.82
RAG answer8K input + 800 output tokens	$0.014	$13.54
Agent step with tools30K input + 2K output tokens	$0.048	$47.94
Long document summary100K input + 2K output tokens	$0.147	$146.64

2,400+

Developers

1.2M+

API calls served

100+

Endpoints

$0.01

Per call

Yep, that's it.

Try it live

Send a message and see DeepSeek V4 Pro respond in real time.

POST/v1/ai/chatdeepseek/deepseek-v4-pro

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

DeepSeek V4 Pro specs

Provider	DeepSeek
Model ID	deepseek/deepseek-v4-pro
Endpoint	/v1/ai/chat
Type	Text Generation
Context window	1.05M tokens
Max output	384K tokens
Reasoning	No
OpenAI-compatible	Yes — /v1/ai/chat/completions

How to get a DeepSeek V4 Pro API key

1
Create a free account
Sign up at yepapi.com with Google or email. It takes about 30 seconds and needs no card.
2
Create an API key
Open the dashboard, go to API Keys and create a key. Copy it — it starts with yep_sk_.
3
Call DeepSeek V4 Pro
Send a request to /v1/ai/chat with the x-api-key header and model "deepseek/deepseek-v4-pro".
4
Pay as you go
Usage is billed per request from your balance. Top up any amount; there is no subscription.

Strengths

✓

1M token context

Accepts up to 1,048,576 input tokens, enabling reasoning over entire codebases and large document collections.

✓

Advanced reasoning

A 1.6T-parameter MoE with 49B activated, built for deep multi-step reasoning and complex problem solving.

✓

Strong coding

High-quality code generation, review, and multi-file editing across languages, a core V4 Pro focus.

✓

Agentic workflows

Tuned for tool use and multi-step agentic tasks, supported by the 1M context and 384K output ceiling.

Quick start

Copy this snippet and start making calls with DeepSeek V4 Pro.

const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "model": "deepseek/deepseek-v4-pro",
    "messages": [
      {
        "role": "user",
        "content": "Explain API gateways in 2 sentences."
      }
    ],
    "maxTokens": 256
  }),
});
const { data } = await res.json();
console.log(data.message.content);

DeepSeek V4 Pro vs similar models

Every model below runs on the same API key — switch by changing the model ID.

Model	Provider	Price	Context
DeepSeek V4 Pro	DeepSeek	$1.41 in / $2.82 out per 1M	1.0M
DeepSeek V4 Flash	DeepSeek	$0.13 in / $0.27 out per 1M	1.0M
DeepSeek V3.2	DeepSeek	$0.41 in / $0.62 out per 1M	164K
DeepSeek V4.1 Flash	DeepSeek	$0.44 in / $1.77 out per 1M	1.0M
DeepSeek V4 Pro 0813	DeepSeek	$0.97 in / $2.92 out per 1M	1.0M
DeepSeek R1 0528	DeepSeek	$0.74 in / $3.18 out per 1M	164K
Nemotron 3 Super	NVIDIA	$0 in / $0 out per 1M	262K
Qwen3.7 Flash	Qwen	$0.04 in / $0.19 out per 1M	1M

Why use DeepSeek V4 Pro through YepAPI?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

DeepSeek V4 Pro API: frontier reasoning at budget pricing

DeepSeek V4 Pro is DeepSeek's V4-generation flagship, a 1.6T-parameter MoE with 49B activated, built for advanced reasoning, coding, and agentic workflows with a 1M-token context. YepAPI serves it through one OpenAI-compatible endpoint.

Your single YepAPI key also reaches Claude, Grok, Gemini, Kimi, and more, plus SEO, SERP, and scraping endpoints, so a frontier reasoning model can drive agents over your data tools.

What is DeepSeek V4 Pro?

DeepSeek V4 Pro is the flagship of DeepSeek's V4 generation, a mixture-of-experts model with 1.6 trillion total parameters and 49 billion activated per token. That scale targets frontier-level reasoning, coding, and agentic workflows while keeping inference efficient through MoE. It offers a 1,048,576-token context window and a 384,000-token output ceiling, so it can reason across entire codebases and large document sets and still produce long, detailed responses. Positioned as DeepSeek's most capable model, V4 Pro is built for the hardest tasks, deep reasoning, complex coding, and multi-step agents, at a fraction of premium-flagship pricing.

Build with DeepSeek V4 Pro via YepAPI

Call YepAPI's OpenAI-compatible /v1/ai/chat endpoint with any OpenAI client; tool/function calling uses the standard schema. Set the base URL, add your key, and set the model string to DeepSeek V4 Pro. Switching models is a single string change. Because the same key reaches the full catalog, your agents can use V4 Pro for the hardest reasoning and call cheaper models or YepAPI's SEO and scraping endpoints for routine steps, all from one integration.

DeepSeek V4 Pro API pricing — $1.41 input / $2.82 output per 1M tokens

DeepSeek V4 Pro costs $1.41 per 1M input tokens and $2.82 per 1M output tokens. For a flagship offering frontier reasoning, strong coding, and a 1M context window, this is remarkable value, a small fraction of what comparable premium flagships charge. Per-token billing means you can run demanding reasoning and agentic workloads at scale without the cost typically attached to top-tier models.

DeepSeek V4 Pro for advanced reasoning and agentic coding

DeepSeek V4 Pro is built for the toughest work: deep multi-step reasoning, complex code generation and review across many files, and agentic workflows that plan and call tools. Its 1M context lets it hold whole repositories and reference material, and the 384K output ceiling supports long, detailed results. When you need flagship-level capability for reasoning or autonomous coding agents but want to keep cost manageable, V4 Pro is the standout choice.

Try DeepSeek V4 Pro free

New YepAPI accounts include $5 of free credit with no card required. That lets you put DeepSeek V4 Pro through real reasoning and coding tasks, test it inside an agent with tool calls, and compare it against premium models on the same key, all before committing to any payment method.

Start generating in 30 seconds

$5 free credit on signup. No credit card required. Pay per call.

Get API Key

What developers say

“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
Marcus T.
SEO Platform Founder

“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
Priya S.
Full-Stack Developer

“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Jake R.
Indie Hacker

Frequently asked questions

DeepSeek's V4-generation flagship: 1.6T-parameter MoE with 49B activated, 1M token context, built for advanced reasoning, coding, and agentic workflows.

DeepSeek V4 Pro costs $1.41 per 1M input tokens and $2.82 per 1M output tokens through YepAPI, billed per request with no monthly fee. For example, a chat reply (1K input + 500 output tokens) costs about $0.0028.

Sign up at yepapi.com (Google or email, about 30 seconds), open the dashboard and create an API key. The same key works for DeepSeek V4 Pro and every other model — no separate DeepSeek account or waitlist.

New YepAPI accounts in most countries get free signup credit, enough to test DeepSeek V4 Pro without a card. After that you pay per request at the rates above — there is no subscription.

Use "deepseek/deepseek-v4-pro" as the model on /v1/ai/chat. The short alias "deepseek-v4-pro" also works.

Yes. Point the OpenAI SDK at https://api.yepapi.com/v1/ai with your YepAPI key and set model to "deepseek/deepseek-v4-pro". Streaming works the same way, so existing OpenAI code only needs the base URL and key changed.

DeepSeek V4 Pro supports a 1.0M token context window with up to 384K output tokens per request.