Claude, OpenAI Codex, Google Gemini, and xAI's Grok. Each is a model family (the brain) plus the chat app, API, and coding agent the maker ships around it. Picking one is mostly about which company you trust most and which products you already pay for — the underlying model quality is close enough that it rarely decides the question.
Each guide below is a complete mirror of its standalone subdomain (which now 301s here). For the orchestration harness that ties them together, see Hermes. For setting them up on a specific device, see the OS guides.
A complete, plain-language guide to Claude and the wider Anthropic toolkit — products, design workflow, integrations, and machine builds. The most-used model on the WholeTech network.
An end-to-end guide to OpenAI Codex — the CLI, the IDE extension, the cloud, GitHub @codex, AGENTS.md, approval modes, prompting, and the workflows that actually pay off.
The practical guide to Google's AI stack — the Gemini app, AI Studio, Gemini API, Workspace, Android, Search, model choices, workflows, and how Gemini fits beside Claude, Codex, and Hermes.
The end-to-end guide to xAI's Grok and the platform formerly known as Twitter — the models (Grok 4, 4 Heavy, mini, Aurora, Imagine), every surface, every plan, the timeline algorithm, and how to actually win on X.
| Assistant | Maker | Headline model (May 2026) | Strongest single use | Coding agent |
|---|---|---|---|---|
| Claude | Anthropic | Opus 4.7 | Careful reasoning, long documents, code | Claude Code (CLI + IDE) |
| Codex | OpenAI | GPT-5.5 | Raw coding throughput | Codex CLI + IDE |
| Gemini | Gemini 2.5 Pro | Long context, Google-app integration | Gemini CLI | |
| Grok | xAI | Grok 4 / 4 Heavy | Real-time, X-native context | (no dedicated agent — chat + API) |
Hermes — the orchestration harness that drives any of the four assistants.
OS guides — set them up on Windows, Mac, Linux, Synology, Android, iOS, Proxmox, or Cloud.
Tool map — the full landscape of AI tools, including chat assistants beyond these four (Perplexity, Microsoft Copilot, Meta AI).