🏆 DeepSeek V4 vs V3 vs R1 vs Qwen3: Which Model Should You Use?

Last updated: July 29, 2026 · 6 min read · Pricing & benchmarks comparison

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OpenAI-compatible endpoint. One API key for DeepSeek V4, V3, R1, Qwen3 & more.
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Quick Comparison Table

Feature DeepSeek V4 Best Overall DeepSeek V3 DeepSeek R1 Qwen3 Flash Budget
Input Price $0.28/M tokens $0.14/M tokens $0.55/M tokens $0.07/M tokens
Output Price $0.42/M tokens $0.28/M tokens $2.19/M tokens $0.07/M tokens
Context Window 128K 128K 128K 32K
Reasoning ⭐⭐⭐⭐⭐ ⭐⭐⭐⭐ ⭐⭐⭐⭐⭐+ ⭐⭐⭐
Coding ⭐⭐⭐⭐⭐ ⭐⭐⭐⭐ ⭐⭐⭐⭐⭐ ⭐⭐⭐⭐
Speed Fast Faster Slow (CoT) Fastest
Best For General purpose, agents Balanced tasks Math, logic, hard reasoning High volume, simple tasks

When to Use Each Model

🏅 DeepSeek V4 — Best All-Rounder

Choose this when you need the best balance of quality and cost for general-purpose tasks. It excels at coding, instruction following, and multi-turn conversations. Ideal for AI agents, chatbots, and production systems.

Use cases: Customer support bots, code assistants, content generation, API backends

💰 DeepSeek V3 — Budget Workhorse

Half the price of V4 with still-strong performance. Perfect when you need good quality but want to minimize costs at scale.

Use cases: Batch processing, data extraction, summarization, non-critical workflows

🧠 DeepSeek R1 — Reasoning Champion

Uses chain-of-thought reasoning to solve complex problems. Slower and more expensive per output token, but delivers superior results on math, logic puzzles, and multi-step reasoning tasks.

Use cases: Mathematical proofs, complex debugging, strategic analysis, research tasks

⚡ DeepSeek V4 Flash / Qwen3 Flash — Speed Demons

At $0.07/M tokens, these are perfect for high-throughput scenarios where you need fast responses and can tolerate slightly lower quality.

Use cases: Autocomplete, real-time chat, classification, simple Q&A, prototyping

Cost Calculator: 1M Requests Example

Assuming average 500 input + 200 output tokens per request:

ModelCost per 1M requestsvs OpenAI GPT-4o
DeepSeek V4$22491% cheaper
DeepSeek V3$12695% cheaper
DeepSeek R1$49380% cheaper
Qwen3 Flash / DS Flash$3598.6% cheaper
OpenAI GPT-4o (reference)$2,500

How to Switch Models

All models are available through the same OpenAI-compatible API. Just change the model parameter:

from openai import OpenAI

client = OpenAI(
    base_url="https://eaf9553505eeb8f5-115-190-107-107.serveousercontent.com/v1",
    api_key="your-api-key"
)

# Switch models by changing one line
response = client.chat.completions.create(
    model="deepseek-v4",  # or deepseek-v3, deepseek-r1, qwen3.6-flash, deepseek-v4-flash
    messages=[{"role": "user", "content": "Hello!"}]
)

Model Availability

All models are available 24/7 through our API with 99.9% uptime SLA. Flash models have the lowest latency (~200ms TTFT), while R1 may take 2-5 seconds for complex reasoning.

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