Grok vs ChatGPT: which one, and what neither does
ChatGPT is the safer default: the most polished apps, the deepest ecosystem, and the GPT-5.6 family at $20. Grok's case is speed, price at the frontier, and real-time X data no one else has natively. Both lock you to one vendor's models, one linear chat shape, and usage caps they decline to publish. We build NodePad, so weigh the third column accordingly: it is the option for people whose AI conversations are work product, who want Grok-style directness one message and GPT rigor the next, with the model seeing exactly the context they assembled and nothing else. Casual daily assistant: pick one of the first two. Working sessions you return to for weeks: that is what a canvas is for.
| dimension | Grok | ChatGPT | NodePad |
|---|---|---|---|
| Price of entry | Free (volatile caps); SuperGrok Lite $10/mo; SuperGrok $30/mo; Heavy $300/mo; also bundled with X Premium. | Free; Go $8/mo; Plus $20/mo; Pro $200/mo. Ads are being tested on Free and Go. | Free on community models; paid plans from $5/mo. No ads on any tier. |
| Models you can use | xAI models only; the app exposes modes (Auto, Fast, Expert) rather than exact versions. | OpenAI models only; GPT-5.6 Sol, Terra, and Luna on paid plans. | Claude, GPT, and Gemini in one workspace, picked per message. |
| Newest model access | Staged: Grok 4.5 reached the $300 Heavy tier first; $30 subscribers wait through a rollout queue. | GPT-5.6 rolled out to paid plans on July 9, 2026; Free and Go stay on GPT-5.5. | New models appear for every paid plan at once; every paid plan reaches every model. |
| Context window | 500K on grok-4.5, 1M on grok-4.3 per the API docs; the app does not publish its own numbers. | In-app windows are a fraction of the API's (roughly 32K on Plus) and unpublished. | The model's full window, spent on context you chose rather than a resent scrollback. |
| Who assembles the context | Memory lives outside the window and is injected invisibly; in-chat "forget that" does not actually delete it. | Hidden system prompt plus a memory synthesis rewritten in the background. | You. The path you built plus what you referenced or merged. Nothing hidden, nothing injected. |
| Branching a conversation | None documented; chats are linear inside Workspaces. | "Branch in new chat" copies context to a separate flat chat; no tree view, no merge back. | Fork from any point onto a visible parallel path; merge the paths that earn it. |
| Live data and research | The real differentiator; native access to X's firehose plus DeepSearch cited research. | Deep Research, agent mode, connectors; mature and broad. | No built-in web search; plugins can add tools. If live social data is the job, Grok wins this row outright. |
| Voice, mobile, media | Voice with personas, image and video generation from the $10 tier. | Best-in-class apps and full-duplex voice; native image generation. | Browser only; no voice or media generation. Keep one of these alongside if that is daily use. |
| Usage limits | Rolling windows that shift with demand; exact numbers rarely published. | Dynamic and unpublished; they flex with load and region. | A visible usage meter; add usage when it runs out. No hidden throttles. |
No credit card to start. Every paid plan reaches every model.