Grok 4.5 is xAI's newest flagship model, released on July 8, 2026. It is a reasoning model — it thinks step by step before answering — with a 500K-token context window and strong coding and agentic performance. On Secret Chat it powers the whole Smart Grok family.

How do I use Grok 4.5 on Secret Chat?

Open the Secret Chat app and select the "Grok" model (the Smart one). Leave it on Smart Agentic for automatic routing, or pick a specific mode — Web Search, Deep Research or image generation. Every answer then comes from Grok 4.5.

Why does Grok Fast still use Grok 4.3?

On purpose. Grok 4.3 is a fast, non-reasoning model, ideal for quick everyday questions. Grok 4.5 always reasons before replying and can't turn that off, which is slower and pricier. Keeping Grok Fast on 4.3 preserves a genuinely quick, free option, while the Smart Grok model uses 4.5.

Can I turn off Grok 4.5's reasoning?

No — Grok 4.5 always reasons before answering; reasoning cannot be disabled. You can influence how hard it thinks (low/medium/high effort), and Secret Chat runs it at high effort by default. If you want a direct, non-reasoning answer instead, use the Grok Fast model (Grok 4.3).

Is Grok 4.5 private on Secret Chat?

Secret Chat forwards your prompts through its own proxy, so you use Grok 4.5 without an xAI account and without your requests being tied to you. No profile is built, no chat is associated with your identity, and your history stays in your browser. Provider-side retention may still apply, but your query reaches the model anonymized. Note that the content of your messages is sent verbatim — only your identity is removed.

Can Grok 4.5 search the web on Secret Chat?

Yes. Its Web Search and Deep Research modes attach xAI's live web and X search, so Grok 4.5 combines its reasoning with current information instead of being limited to training-cutoff knowledge.

Grok 4.5 Is Now on Secret Chat AI: xAI's Reasoning Model

Published July 15, 2026

Good news for everyone who reaches for Grok: xAI's Grok 4.5 is now live on Secret Chat AI. The whole Smart Grok family — the automatic Smart Agentic mode and every manual mode behind it — has been upgraded to xAI's newest and most capable model, right inside the same private workspace where you already chat with GPT, Claude, Gemini and Perplexity.

Grok 4.5 is a genuine step up: a reasoning model that thinks before it answers, an Opus-class contender on the hardest coding and agentic tasks, and the current flagship of xAI's lineup. Below is what it is, exactly how it shows up on Secret Chat, the one place we deliberately kept the older Grok 4.3, and — as always — how you get all of it without a profile ever being built around you.

What Is Grok 4.5?

Grok 4.5 is xAI's latest frontier model, released on July 8, 2026. Unlike the fast, direct Grok models that came before it, Grok 4.5 is a reasoning model: it works through a problem step by step before it replies. A few things set it apart:

Reasoning is always on. Grok 4.5 always reasons before answering — reasoning cannot be switched off. You can dial how hard it thinks (low, medium or high effort), and on Secret Chat it runs at high effort by default, so you get its deepest deliberation on every reply.
A 500K-token context window. It can hold roughly half a million tokens of context at once — long documents, sprawling codebases, and lengthy conversations stay in view while it works.
Opus-class capability. xAI positions Grok 4.5 at the top of its range, tuned hard for coding and long-horizon agentic work, with strong tool use, structured output and web/X search built in.

Grok 4.5 Powers the Whole Smart Grok Family

On Secret Chat, "Grok" isn't a single toggle — it's the Smart Grok model with an intelligent Smart Agentic router plus a set of manual modes you can choose yourself. As of this release, every one of those runs on Grok 4.5:

Smart Agentic — the default. A router reads each message and decides how to handle it: a quick reply for casual chat, a web search when you need fresh facts, or deep research for an involved question — now all answered by Grok 4.5.
Web Search — Grok 4.5 with xAI's live web and X (Twitter) search attached, so answers combine its reasoning with current information rather than training-cutoff knowledge.
Deep Research — the same model turned loose on multi-step research questions, gathering and synthesizing sources before it answers.
Image generation — Grok's image mode (Grok Imagine Pro) for turning a prompt into a picture.

In short: pick the Grok model, and whether you leave it on Smart Agentic or switch to a specific mode, the brain behind it is now xAI's newest reasoning model.

Why "Grok Fast" Deliberately Stays on Grok 4.3

There is one intentional exception. Secret Chat also offers a separate, free Grok Fast model for quick, everyday questions — and that one stays on the older Grok 4.3 on purpose.

The reason is simple. Grok 4.3 is a genuinely non-reasoning model: it answers directly, which makes it fast and cheap. Grok 4.5, by contrast, always reasons before replying — you can't turn that off. Moving Grok Fast to 4.5 would force every throwaway question to sit through a full reasoning pass, making it slower and more expensive for no real benefit. So we kept the split: Grok Fast stays on the quick, non-reasoning Grok 4.3, and the Smart Grok family gets the heavyweight Grok 4.5. You choose the right tool for the moment.

How to Use Grok 4.5 on Secret Chat AI

There's nothing to install or switch on — it's already live:

Open the Secret Chat app and select the Grok model in the model picker (the Smart one, not "Grok Fast").
Leave it on Smart Agentic to let the router handle everything, or pick a specific mode next to the message box — Web Search, Deep Research, or image generation — when you already know what you want.

From there, every answer comes from Grok 4.5. If you just want a fast, no-frills reply for a simple question, switch to the free Grok Fast model instead — it stays on the quick Grok 4.3.

I want your best reasoning on a hard problem. Take your time, think it through step by step, weigh the approaches you would reject and why, and then give me your strongest answer. Here is the problem:

Private by Design, Whatever Grok You Pick

The upgrade changes the model, not the privacy. Secret Chat is a private gateway between you and the AI providers: your prompts are forwarded through our proxy, so you don't need an xAI account and your requests are never tied to you on the provider's side. We don't build a profile of you, and no chat is ever associated with your identity. Your conversation history lives locally in your own browser, not on our servers, and you can pay with crypto if you'd rather not link a card to your AI use.

That matters especially with Grok. As we covered in Does Grok Save Your Chats?, xAI trains on Grok conversations by default and keeps your history. Reaching Grok 4.5 through Secret Chat lets you use the exact same model as a stranger: retention may still apply at the provider, but your query arrives anonymized — not linked to your email or identity. One honest caveat, as always: Secret Chat removes you from your queries, it does not remove the content of your messages, so redacting any identifying details before you send is still up to you. For the full picture of how anonymized Grok access works, see our dedicated Private Grok page.

If you like having several models on tap for the same question, that's the whole idea — see why using GPT, Claude, Gemini, Grok and Perplexity together beats relying on any single one.

Conclusion

Grok 4.5 is xAI's newest and most capable model, and it now powers the entire Smart Grok family on Secret Chat — Smart Agentic, Web Search, Deep Research and image generation alike. We kept the free Grok Fast model on the quick, non-reasoning Grok 4.3 so you always have a cheap fast option, and reserved Grok 4.5's deeper reasoning for the "Grok" model where it earns its keep.

Try it today at Secret Chat AI — with the full multi-model lineup, your history in your own browser, and every query reaching the model anonymously.

Frequently Asked Questions

What is Grok 4.5?
Grok 4.5 is xAI's newest flagship model, released on July 8, 2026. It is a reasoning model — it thinks step by step before answering — with a 500K-token context window and strong coding and agentic performance. On Secret Chat it powers the whole Smart Grok family.
How do I use Grok 4.5 on Secret Chat?
Open the Secret Chat app and select the "Grok" model (the Smart one). Leave it on Smart Agentic for automatic routing, or pick a specific mode — Web Search, Deep Research or image generation. Every answer then comes from Grok 4.5.
Why does Grok Fast still use Grok 4.3?
On purpose. Grok 4.3 is a fast, non-reasoning model, ideal for quick everyday questions. Grok 4.5 always reasons before replying and can't turn that off, which is slower and pricier. Keeping Grok Fast on 4.3 preserves a genuinely quick, free option, while the Smart Grok model uses 4.5.
Can I turn off Grok 4.5's reasoning?
No — Grok 4.5 always reasons before answering; reasoning cannot be disabled. You can influence how hard it thinks (low/medium/high effort), and Secret Chat runs it at high effort by default. If you want a direct, non-reasoning answer instead, use the Grok Fast model (Grok 4.3).
Is Grok 4.5 private on Secret Chat?
Secret Chat forwards your prompts through its own proxy, so you use Grok 4.5 without an xAI account and without your requests being tied to you. No profile is built, no chat is associated with your identity, and your history stays in your browser. Provider-side retention may still apply, but your query reaches the model anonymized. Note that the content of your messages is sent verbatim — only your identity is removed.
Can Grok 4.5 search the web on Secret Chat?
Yes. Its Web Search and Deep Research modes attach xAI's live web and X search, so Grok 4.5 combines its reasoning with current information instead of being limited to training-cutoff knowledge.