DeepSeek V4.1-Flash adds server-side built-in tools: web search, file parsing, URL reading

deepseek_ai · x · 2026-11-13

DeepSeek launched built-in tools for V4.1-Flash (deepseek-flash) across Messages, Responses and Chat Completions APIs, with tool calls and context assembly handled server-side:

• Web Search: web/image search with citations in non-thinking mode
• Deep Thinking Search: searches and reads pages throughout multi-step reasoning
• File Input: parses PDFs, Office files, images into context
• URL Reading: auto-fetches links in user messages
• Safety Checks: input/output screening with refusal indicators

Enabled via deepseekwebsearch and deepseekreadurl. Public-facing apps must enable safety checks; developers remain responsible for moderation, model registration and AI-content labeling. Tools are billed separately from tokens.

Related event: DeepSeek Ships V4.1-Flash with Built-in Tools, Opens Full App Capabilities as APIs with Separate Tool Pricing(6 posts)→

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