benchr
Picture a story breaking an hour ago. A product just got recalled, a match just ended in chaos, a stock is moving on a rumor that's only on X. Ask a model trained months ago and you'll get a confident answer about a world that no longer exists. That gap, between what a model learned and what's true this minute, is the whole reason this comparison exists.
Grok 4.3 is built to close it. xAI ships it with two real-time tools: a Web Search tool that "searches the web in real-time and browses web pages," and an X Search tool that runs keyword, semantic, and user search plus thread fetch across X, formerly Twitter. That second one is the differentiator. No other major assistant has first-class, real-time access to X's live firehose. ChatGPT, by contrast, is the polished generalist, with web search bolted on when it needs it.
Grok 4.3 arrived in spring 2026 as a reasoning-capable model with a 1-million-token context window, taking text and image input. A note on hype, though: despite third-party claims, xAI's own docs do not list native video input, so don't plan around it. And xAI hasn't published clean Grok 4.3 benchmark scores, so this page leans on what's documented, the live-context tooling and the pricing, not on leaderboard numbers that don't exist yet.
| Grok 4.3 | ChatGPT (GPT-5.5) | |
|---|---|---|
| Real-time access | Web Search + X Search tools, live X firehose | ChatGPT Search, free, no live X |
| API price ($/M) | $1.25 in / $2.50 out | $5 in / $30 out |
| Context window | 1M tokens | 1.05M tokens |
| Inputs | Text + image | Text + image |
| Consumer plan | SuperGrok, ~$30/mo (reported) | Plus, $20/mo |
How to decide in one pass
You don't need a benchmark to make this call. You need to ask one question about your task, and the answer routes you cleanly.
Breaking news, a live event, prices or sentiment moving right now. If yes, you want fresh data, not a trained-in memory.
Live reactions, a developing thread, what a specific account just posted. Grok's X Search reads that firehose directly; nothing else does.
Reasoning, drafting, coding, explaining, anything evergreen. GPT-5.5's breadth makes it the safer, stronger generalist.
Where ChatGPT stays the default
For the other 90% of what you'll ask, ChatGPT is the stronger tool. GPT-5.5 is the broad generalist that powers ChatGPT's default for everyone, and it's better at sustained reasoning, careful writing, and coding than a model tuned around live retrieval. ChatGPT Search is also free and needs no signup, so for everyday "look something up" you're not even paying. The GPT-5 review covers where that generalist strength holds and where it cracks. If you want the full model spec for Grok 4.3 itself — pricing tiers, context window, and what xAI does and doesn't publish about benchmarks — the Grok 4.3 review has it.
It's also worth being precise about what "real-time" means. On the API, Grok's web and X search are tools an app or developer turns on, not an unconditional behavior of the raw model. In the consumer Grok app they're part of the experience. So Grok can reach the live web and X, but it isn't magically always doing it, and ChatGPT isn't blind to the web either. The honest gap is narrower than the marketing, and it's specifically about X.
The agent angle
If you're building rather than chatting, Grok 4.3's cheap tokens plus live tools make it a natural fit for monitoring agents, things that watch a topic, a ticker, or a set of accounts and report changes. ChatGPT's broader reasoning suits agents that plan and execute multi-step work. The wider state of agent tooling is in AI agents, eighteen months in, and if your real need is sourced answers rather than a chat assistant, compare the dedicated tools in the AI search engines piece.
Use Grok 4.3 when the question is about right now, and especially when the action is on X, where its live search is one of a kind and its API tokens cost a fraction of GPT-5.5's. Stick with ChatGPT as your everyday default for reasoning, writing, and coding. They're not really rivals for the same slot, so the cheap, correct move is to keep ChatGPT open and pull up Grok for the live stuff.
If you're still sorting out which general assistant should be your home base before you add Grok for live context, start with the ChatGPT vs Claude vs Gemini comparison.