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Reasonix

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

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at a glance
verified specs
Pricing Model
open-source
License
Open Source
Telemetry
Clean
Last Verified
Aug 26, 2026
Supported Platforms
Terminal CLI, Go rewrite, npm/installable CLI, BYOK model workflows
Primary Categories
Terminal & CLI Tools, AI CLI Agents, AI Coding Assistants
Key Use Cases
Terminal Agents, Code Generation, Agentic Development, Local AI Workflows
Tags
Open Source, CLI Agent, DeepSeek, BYOK, Agentic, Coding Agents, CLI

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 & Platform Specs

Pricing Summary

Reasonix is 100% free and open-source software under the MIT license ($0 software cost). It utilizes DeepSeek's high-efficiency prefix caching to reduce LLM token expenses during long autonomous coding runs.

full pricing breakdown →

Supported Platforms

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

Sources & verification

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Content verified

Verification dates are editorial checks. Routine CMS saves and automatic updatedAt timestamps do not advance them.

FAQ

What is Reasonix?

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.

Is Reasonix free?

Yes — Reasonix is open source and free to use. Reasonix is 100% free and open-source software under the MIT license ($0 software cost). It utilizes DeepSeek's high-efficiency prefix caching to reduce LLM token expenses during long autonomous coding runs.

Is Reasonix open source?

Yes — Reasonix is open source.

Is Reasonix still maintained?

Yes — Reasonix is active. Its listing was last verified on August 26, 2026.