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Reasonix

DeepSeek-native terminal coding agent with a Go rewrite and MCP support

open sourceupdated Jun 8, 2026
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Reasonix is an open-source terminal coding agent built around DeepSeek workflows, with a newer Go-based 1.0 line, MCP integration, repository-aware code understanding, and BYOK model usage. It fits developers who want a DeepSeek-first CLI agent rather than a Claude- or OpenAI-native workflow.

Reasonix is an open-source terminal coding agent for developers who want a DeepSeek-first workflow in the command line. The current 1.0 generation is a ground-up Go rewrite, while the older TypeScript 0.x line is documented as legacy and maintenance-only.

The tool is positioned around codebase-aware reasoning, terminal execution, and agentic development loops. Its README and migration guide emphasize the Go rewrite, MCP support, and repository intelligence rather than a simple chat wrapper, which makes it a better fit for the AI CLI agent category than a generic model SDK.

For aicoolies readers, Reasonix is most useful as a contrast to Claude Code, OpenCode, Qwen Code, Aider, and other terminal agents. It gives DeepSeek users a dedicated agent shell, but teams should still review provider API costs, model routing, and the current branch/install guidance before standardizing on it.

Reasonix is MIT-licensed and free to install as open-source software. Model usage, API keys, and any hosted provider costs remain separate from the package itself, so the practical cost depends on the user’s DeepSeek or compatible model setup.

Pricing

Free and open source under MIT; model/API usage is billed separately by the chosen provider.

Platforms

Terminal CLI, Go rewrite, npm/installable CLI, BYOK model workflows

Categories

Terminal & CLI ToolsAI CLI AgentsAI Coding Assistants

Tags

Open SourceCLI AgentDeepSeekBYOKAgenticCoding AgentCLI

Use Cases

Terminal AgentsCode GenerationAgentic DevelopmentLocal AI Workflows

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