DeepSeek-V4 Online — Direct Web Chat Entry

DeepSeek-V4 is DeepSeek's latest large language model series, released in 2026. Core upgrades include a million-token (1M) context window, significantly enhanced Agent capabilities, and major gains across math reasoning, code generation, and world knowledge benchmarks. DeepSeek-V4 comes in Pro and Flash editions to suit different use cases.

DeepSeek-V4-Pro has 1.6T total parameters and 49B active parameters — a flagship model for complex reasoning, agentic coding, and long-document analysis. DeepSeek-V4-Flash has 284B total parameters and 13B active parameters, delivering lower latency and lower cost while retaining strong capabilities — ideal for everyday chat and high-frequency simple tasks. Both support a 1M context window.

DeepSeek-V4's 1M-token context window equals roughly 750,000 Chinese characters — enough to process ultra-long legal contracts, entire code repositories, dozens of academic papers, or full novels in one pass. Compared to the previous DeepSeek generation, V4 requires only 27% of the compute and 10% of the VRAM to handle million-token context, making ultra-long context truly usable.

DeepSeek-V4 supports OpenAI Chat Completions-compatible and Anthropic-compatible APIs. Set model_name to deepseek-v4-pro or deepseek-v4-flash in your API request. Base URL: https://api.deepseek.com. See our tutorials for detailed integration guides.

DeepSeek-V4 is the Agentic Coding model used internally at DeepSeek and achieves the best open-source score on Agentic Coding benchmarks. It supports tool use, multi-step task planning, and code generation, and is optimized for leading Agent products including Claude Code, OpenClaw, and OpenCode.

Yes. DeepSeek-V4 is open-sourced under the MIT license with model weights available for the community to deploy and build upon — continuing DeepSeek's commitment to making advanced AI reasoning accessible worldwide.

Compared to DeepSeek V3.2, DeepSeek-V4-Pro gains over 20 points in agent capabilities, nearly 10 points in math reasoning, and nearly 12 points in instruction following. On the SuperCLUE Chinese benchmark, DeepSeek-V4-Pro ranks #1 in China at 70.98, with the Flash edition close behind at 68.82.

DeepSeek has launched vision mode, and DeepSeek-V4 supports multimodal image recognition and analysis. DeepSeek-V4.1, planned for June 2026, will add full coverage across text, image, and audio, along with a complete enterprise toolchain.

DeepSeek-V4-Flash is positioned as a high-value lightweight edition — approximately $0.14 per million input tokens overseas and ¥1.25 domestically. It matches Pro on simple tasks, making it an ideal choice for everyday personal use.

Yes. Legacy API model names deepseek-chat and deepseek-reasoner will be deprecated on July 24, 2026. Migrate deepseek-chat to deepseek-v4-flash and deepseek-reasoner to deepseek-v4-pro as soon as possible to avoid service interruption.

DeepSeek-V4 excels across many scenarios: long-document analysis and summarization, software development and Agent automation, math and STEM reasoning, multilingual translation and writing, legal contract review, academic literature reviews, and more. Million-token context gives DeepSeek-V4 a unique edge on complex, long-text tasks.

DeepSeek-V4 delivers outstanding Chinese performance. On SuperCLUE, DeepSeek-V4-Pro ranks #1 in China at 70.98, and scores 84.4% on the Chinese-SimpleQA benchmark. Whether for Chinese conversation, writing, or knowledge Q&A, DeepSeek-V4 provides a fluent and accurate experience.