DeepSeek Agent
OpenAI/Anthropic-compatible Chinese model API (deepseek-chat, deepseek-reasoner) that exposes function calling with a strict JSON-Schema mode, separate reasoning_content channel, and is positioned primarily as a drop-in backend for third-party agent harnesses (Claude Code, Copilot CLI, OpenCode).
Description
DeepSeek does not ship a hosted agent product; instead the API mirrors OpenAI's Chat Completions shape (and is also Anthropic-compatible) so any existing agent harness can swap DeepSeek in as the model. Function calling is supported with up to 128 tools, a strict mode that pins outputs to a JSON Schema, and tool_choice (none/auto/required). The reasoning model deepseek-reasoner emits a separate reasoning_content stream alongside the answer. DeepSeek's own listed agent integrations include Claude Code, GitHub Copilot, GitHub Copilot CLI and others — the company is the model, the agents are the third parties.
Solution
Stateless OpenAI/Anthropic-compatible Chat Completions endpoint. The caller drives a standard tools-loop: post messages + tools[], receive either content or tool_calls, execute tools, append tool messages, repeat. For deepseek-reasoner the model also emits a reasoning_content field at the same level as content, which clients are expected to surface or discard. DeepSeek does not host the agent runtime — the harness lives in the caller (Claude Code, etc.).
Primary use cases
- drop-in backend model for Claude Code / Copilot CLI / OpenCode style agents
- schema-strict function calling for tool-using agents
- reasoning agents that need a separate chain-of-thought channel
- JSON-output extraction pipelines
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