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DeepSeek · DeepSeek · Balanced

DeepSeek V4 Pro

New

DeepSeek's larger V4 model for harder coding and reasoning, text input only.

Model id

deepseek-v4-pro

Price per 1M tokens

Input
$1.32
Output
$3.96
Cached input
$0.04497% below input

Output is 3× the input rate. $1 covers about 303 prompts of 1,000 input + 500 output tokens. 1 credit = $1 of usage. All rates

Ways to pay

  • Pay as you goPrepaid balance at the rates above, top-ups from $3
  • Pro $5/monthWeekly allowance of about 618.2k uncached input tokens of this model
  • Plus $9/monthWeekly allowance of about 1.16M uncached input tokens of this model, 2% below the rates above
  • Max $29/monthWeekly allowance of about 3.85M uncached input tokens of this model, 4% below the rates above

Plans are opening soon; until then every model is pay as you go. How plans will work

Start using DeepSeek V4 Pro

Set RELAYKIT_API_KEY to a key from your console, then run any example. Streaming is on so long answers are not cut off by idle-connection timeouts.

curl https://api.oneaiapikey.com/v1/chat/completions \
  -H "Authorization: Bearer $RELAYKIT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek-v4-pro",
    "stream": true,
    "messages": [{"role": "user", "content": "In two sentences, when should I use coding agents?"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.oneaiapikey.com/v1",
    api_key=os.environ["RELAYKIT_API_KEY"],
)

stream = client.chat.completions.create(
    model="deepseek-v4-pro",
    messages=[{"role": "user", "content": "In two sentences, when should I use coding agents?"}],
    stream=True,  # recommended for long outputs
)
for chunk in stream:
    if chunk.choices and chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="", flush=True)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.oneaiapikey.com/v1",
  apiKey: process.env.RELAYKIT_API_KEY,
});

const stream = await client.chat.completions.create({
  model: "deepseek-v4-pro",
  messages: [{ role: "user", content: "In two sentences, when should I use coding agents?" }],
  stream: true,
});

for await (const chunk of stream) {
  process.stdout.write(chunk.choices[0]?.delta?.content ?? "");
}

More: quickstart · API reference · try it in Chat first

Overview

When DeepSeek V4 Pro fits

DeepSeek V4 Pro is a balanced model from DeepSeek, available here under the exact model id “deepseek-v4-pro”. It is the middle option: noticeably cheaper than a flagship while still capable enough for most day-to-day work.

It costs $1.32 per million input tokens and $3.96 per million output tokens, so output is 3× the input rate. Output is comparatively affordable here, which suits generation-heavy jobs such as drafting, long-form answers or writing code from scratch. With a 3:1 input-to-output mix it ranks 2nd lowest-cost of the 11 models on this site.

Cached input bills at $0.044 per million tokens, 97% below the standard input rate. Workloads that resend the same system prompt, tool definitions and files on every turn, coding agents in particular, get the most from this.

It is served through the OpenAI-compatible format at https://api.oneaiapikey.com/v1, so any SDK or tool that lets you set a custom base URL, for example Codex CLI, Cursor and Cline, can use it. It is not offered on the Anthropic Messages endpoint; pick an Anthropic-format model for Claude Code.

Cost examples

What a workload costs

Worked from the published rates, with the arithmetic shown. Real numbers depend on prompt size and how much the model writes.

Model your own traffic

  • 1M input + 200k output tokens

    1 × $1.32 + 0.2 × $3.96

    $2.112

  • 1,000 chat replies (1.5k in, 400 out each)

    1000 × (0.0015 × $1.32 + 0.0004 × $3.96)

    $3.564

    About 280 replies per credit

  • One agent turn (30k in, 24k of it cached, 2k out)

    0.006 × $1.32 + 0.024 × $0.044 + 0.002 × $3.96

    $0.016896

    $0.04752 with no cache hits. Writing tokens into the cache bills 1.25× the input rate (2× for a 1-hour cache) when the provider reports cache writes

Works with

Compatible agents 7

Coding tools that speak the OpenAI format. Each guide sets the base URL, key and this model id.

Try DeepSeek V4 Pro from a $3 top-up.

There is no sign-up credit: add $3 or more to your wallet and every request is billed at the rates above, with a receipt in your usage log.

DeepSeek V4 Pro is developed by DeepSeek. Model names and trademarks belong to their owners. Relaykit is an independent API gateway and is not affiliated with, endorsed by or sponsored by DeepSeek.