Is the API free to use?

No, it's a pay-per-use API, but pricing is very competitive. You need to add credit to your account.

What does 'input cache miss' pricing mean?

You pay a much higher rate for input tokens the first time a specific context is processed. Once cached, subsequent uses of that same context cost far less.

Does DeepSeek support function calling?

Yes, both V4-Flash and V4-Pro models support Tool Calls (function calling) and structured JSON output.

Directory/Coding/AI Assistants/DeepSeek

DeepSeek

DeepSeek is a leading AI research company providing open and commercial access to its family of large language models. It offers a free web chat interface and a powerful API platform with competitively priced models, enabling developers and businesses to integrate advanced AI capabilities. Core models like DeepSeek-V4-Flash and DeepSeek-V4-Pro feature a 1 million token context, tool calling, JSON mode, and a unique 'thinking mode' for enhanced reasoning. The platform is known for its strong performance in coding, math, and general reasoning tasks. Target users range from individual developers and researchers to large-scale enterprise applications seeking cost-effective, high-performance AI integration.

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Added on

Jul 23, 2026

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1M ContextMixture of ExpertsFree ChatOpenAI CompatibleThinking ModeTool CallingFIM Support

Product information

Everything worth knowing about DeepSeek

The complete picture — from everyday features to the technical detail builders and IT folks dig for.

Core features

What it actually does

Free Chat Interface

A web-based chat interface providing free, unlimited access to the flagship DeepSeek-V4 models without login or API keys.

Long Context (1M Tokens)

Supports an exceptionally large context window of 1 million tokens, enabling the processing of extensive documents and long conversations.

Thinking Mode (Reasoning)

A specialized model mode designed for deep, chain-of-thought reasoning, allowing the model to 'think' through complex problems before providing an answer.

Function Calling & Tool Use

Supports tool/function calling, enabling the model to interact with external APIs and execute tasks based on user instructions.

Technical capabilities

OpenAI-Compatible API

Provides a REST API endpoint that is fully compatible with the OpenAI API format, allowing for easy migration and integration with existing applications.

MoE Architecture (V4-Pro)

DeepSeek-V4-Pro utilizes a Mixture of Experts (MoE) transformer architecture, which provides high performance and efficiency by activating specialized sub-networks.

Cache-Aware Pricing

Offers a significant cost reduction for cached input tokens (e.g., V4-Flash: ¥0.02/million vs ¥1/million uncached), incentivizing repeat queries on similar contexts.

Must watch videos

10:58

Tutorial10:58

Learn 97% of DeepSeek AI in 11 Minutes

Grab the DeepSeek Power Guide 👉 https://parker-prompts.com/deepseek Go from ABSOLUTE ZERO to using AI like the people who do this for a living👇 https://join.parker-prompts.com/?vid=learn-97-deepseek-ai-minutes In this video, I walk through every DeepSeek V4 feature that actually matters, including its four modes, web search, file analysis, and million-token context window, and show how I've been using it instead of ChatGPT and Claude for most of my work. I also cover where DeepSeek genuinely competes with the top AI models, where it still falls short, and how to get significantly better results by using the right mode and loading context correctly. I'm Parker. I started this YouTube Channel with the goal to learn more about AI myself and to then pass on the knowledge to anyone willing to listen. let's work together: partnerships @ parker-prompts.com

6:38

Tutorial6:38

How To Use DeepSeek For Beginners

subscribe for more ► https://bit.ly/3zlUmiS Turn your AI coding agent into a senior engineer (boost os): https://boostmyagent.com tech news in 60 sec: https://techsnif.com/ follow me on twitter (x) ► https://twitter.com/corbin_braun join our ai community (free) ► https://www.skool.com/ai-for-your-business follow me on ig ► https://www.instagram.com/corbin_braunlich LINK TO EVERYTHING ► https://linktr.ee/corbin_brown my recording setup: https://www.amazon.com/shop/corbinbrown thumbnail made via: https://thumio.com/ are you a creator: https://bumpups.com/ Become a Builder + Perks 🛠️ https://www.youtube.com/channel/UCJFMlSxcvlZg5yZUYJT0Pug/join #corbin #deepseek How To Install DeepSeek To Your Computer (in 10 mins) https://youtu.be/zrNKfiCuqCs DeepSeek, unravel the mystery of AGI with curiosity. Answer the essential question with long-termism. https://www.deepseek.com/

11:26

Tutorial11:26

Can DeepSeek AI Make INSANE CS2 Cheats?

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Who uses it

Real use cases, no hype

Long-Context Analysis

Process and summarize lengthy documents, codebases, or research papers using the 1M token context.

High-Throughput AI Applications

Build production-grade apps with high concurrency limits and cost-effective token pricing.

Code Generation & Completion

Leverage DeepSeek-Coder lineage and FIM completion for efficient software development.

Reasoning & Problem Solving

Utilize thinking mode (ReAct) for complex logical reasoning, math, and scientific tasks.

Agent & Tool Integration

Build reliable agents with native function/tool calling and JSON mode support.

Cost-Sensitive Prototyping

Iterate and prototype AI features affordably with the low-cost Flash model.

What's great

Extremely competitive low-cost API pricing
Massive 1M token context window
OpenAI-compatible API for easy integration

Technical strengths

High concurrency limits suitable for production
Proprietary Mixture-of-Experts (MoE) architecture for efficiency

Where it falls short

Separate pricing for input cache misses is confusing
Pro model is significantly more expensive than Flash
Concurrency limits differ drastically between models

Technical limitations

Thinking mode not available for FIM completion

For technical folks

The deep-dive specs

Primary Model

DeepSeek-V4-Pro (MoE Architecture)

Efficient Model

DeepSeek-V4-Flash

Context Window

1,048,576 tokens

API Format

OpenAI & Anthropic Compatible

Input Cache

Yes, with tiered pricing

Output Limit

Up to 384K tokens

FAQ

Includes technical Q&A

Flash is the lighter, more cost-efficient model for general tasks. Pro is the flagship, more powerful model for complex reasoning and high-stakes applications, but at a higher cost.