Deepseek - 2026 Pricing, Features, Reviews & Alternatives

Deepseek is an AI research company that develops and open-sources frontier large language models, delivering products across two primary surfaces: a free chat interface accessible via web (chat.deepseek.com) and mobile (iOS and Android), and an API platform hosted at api.deepseek.com for developer and enterprise integration. The chat interface requires no subscription, carries no ads, and includes no in-app purchases. Core chat capabilities include web search integration, a Deep Think reasoning mode with configurable thinking effort levels (low, high, max), file upload with text extraction, multimodal input via a vision model supporting mixed text and image input, and cross-platform chat history sync. A 1M token context window is available by default across all services.

The API platform supports OpenAI ChatCompletions and Anthropic API formats, reducing the integration effort for teams already working within those ecosystems. Additional API-layer capabilities include hard disk caching to reduce per-request costs, peak and off-peak pricing tiers, Responses API support, and Codex integration. For teams building agentic systems, the DeepSeek Harness plugin-based agent framework (currently in developer preview) supports sandboxes, tool-use, session logging, and custom agent presets, with thinking integrated directly into tool-use workflows.

All model weights are released under the MIT License, permitting free download, self-hosted deployment, and derivative use including model distillation and derivative product development. Technical reports are published alongside each model release, supporting academic research and community evaluation. The underlying model architecture uses a Mixture-of-Experts (MoE) design with chain-of-thought reasoning (DeepSeek-R1 series), retrieval-augmented generation (RAG) support, and multimodal vision capabilities. Target users span general consumers, software development teams, academic researchers, and organizations requiring agentic coding and tool-use capabilities.