Model
Mistral in any tab: Mistral Large 4 in a browser sidebar
Copilotly runs Mistral Large 4 in a sidebar beside the page you are on, in Chrome, Edge, Firefox, Brave and Opera. It is not made by Mistral AI; it offers Mistral next to GPT, Claude, Gemini and others.
By the Copilotly editorial team. Last verified November 11, 2026 against the current Copilotly release.
Quick answer
Mistral's own chat product, formerly Le Chat and now called Vibe, runs on the web and mobile, and we found no official Mistral browser extension. To use Mistral Large 4 in a sidebar on any page, install Copilotly, pick it in the model menu and press Alt+C. Free includes 10 premium messages a day.
- Mistral Large 4 and the compact Mistral Small 4
- Described in the picker as European and multilingual
- Free plan includes 10 premium-model messages a day
- Or use your own Mistral API key, unmetered by Copilotly
At a glance
- Mistral models
- Mistral Large 4 (premium), Mistral Small 4 (fast)
- Mistral Large 4
- Open-weight multimodal, 1M-token context (per Mistral, Nov 2026)
- Price to start
- Free, no card; 10 premium messages a day
- Works in
- Chrome, Edge, Firefox, Brave, Opera, Arc, Vivaldi
- Your own key
- Mistral API key, never metered by Copilotly
- Made by
- Copilotly, not Mistral AI
How to use Mistral in any tab
Install the extension
Add Copilotly from the download page for Chrome, Edge, Firefox, Brave, Opera, Arc or Vivaldi. Create a free account when it asks; there is no card.
Pick Mistral Large 4 in the model menu
Open the model menu and choose Mistral Large 4, described as European and multilingual. Mistral Small 4 is the compact, quick model.
Open it on any page with Alt+C
Press Alt+C to open the sidebar beside whatever page you are on. Ask about the page, select text and rewrite it, or start a new chat. Switching to another model mid-conversation is one click in the same menu.
What does Mistral in a browser sidebar do?
Choose Mistral Large 4 and the sidebar answers with Mistral while it can read the page you are on.
Writing and questions in more than one language
Copilotly's picker describes Mistral Large 4 as European and multilingual, so it is a good one to try for writing and questions in languages other than English, and alongside bilingual page translation when you read in a second language. Mistral's own model pages do not make a language claim for it, so test it on your language before relying on it.
General-purpose and multimodal
Mistral calls Large 4 an open-weight, general-purpose multimodal model with a 1M-token context, listing structured outputs, function calling, document Q&A and chat completions.
The rest of the product
The rest of Copilotly works the same whichever model answers: rewrite selected text anywhere, web search with cited sources, chat with files and memory and custom instructions.
Is there an official Mistral or Le Chat browser extension?
We found none. as of November 2026, Mistral's product page says Le Chat is now Vibe, which combines an AI chat assistant and a coding agent, with your conversations, settings and plans carried over. It links to web, iOS and Android apps, lists web search, voice input, agents, deep research, document creation and connectors to 100+ tools, and does not mention a browser extension. The extensions that turn up in store searches for Le Chat are by third parties and small in number.
When Mistral's own app is the better choice
If you want Mistral's own assistant, its connectors to tools like Slack, GitHub and Jira, or its coding tools, use Mistral's app. Check Mistral's site for current plans.
Where Copilotly differs
- A sidebar on the page. Mistral beside what you are reading, in any supported browser.
- Every model in one menu. GPT, Claude, Gemini, Grok and DeepSeek too.
- Bring your own key. Use a Mistral API key and pay Mistral directly.
Copilotly does not have Mistral's tool connectors; it works on the page and files in front of you.
Which Mistral models do you get on each plan?
Mistral's model overview lists many models, including audio, OCR and embeddings; the two in Copilotly's picker are the general-purpose ones (as of November 2026).
| Model | Tier | Free plan | Pro plan |
|---|---|---|---|
| Mistral Small 4 | fast | Included, within your token allowance | Included, within your token allowance |
| Mistral Large 4 | premium | 10 messages a day, then Mistral Small 4 | Unlimited |
There is no frontier-tier Mistral model in the list. Pro is $6.99/week, $19.99/month or $149.99/year, with a 7-day free trial for first-time subscribers.
Mistral Large 4
Mistral describes it as an open-weight, general-purpose multimodal model; its model page lists a 1M-token context and a 1.6B-parameter vision component. Free gets 10 messages a day.
Mistral Small 4
Mistral says it combines instruct, reasoning and coding in one model. Copilotly's picker calls it compact and quick, and it is available on every plan within your token allowance. See pricing for plan limits.
Can I use Mistral without a subscription?
On the free plan
Yes. The free plan includes Mistral Small 4 and 10 premium-model messages a day for Mistral Large 4. A free account is required; a card is not. After 10 messages the chat continues on Mistral Small 4.
On your own Mistral API key
Every model on this page can also run on your own API key. Requests made on your own key are never metered by Copilotly, whatever the model's tier, and that includes frontier models on the free plan, which are otherwise Pro-only. You pay the provider directly at their API rates. The steps are on the bring your own key page.
Connect a Mistral API key and Mistral Large 4 runs unmetered, billed by Mistral. Mistral's API account is separate from its chat plans, so check which one you hold.
When is Mistral the right pick?
Several languages
Try Mistral Large 4 when you work in more than one language, or when you want a second opinion from a different provider. It is a premium model, so it draws on your 10 daily messages on Free.
Everyday edits
Mistral Small 4 is compact and quick for everyday edits and lookups, and Mistral says it handles instruct, reasoning and coding tasks in one model.
Compare on your own text
Compare Mistral with Gemini or Claude on text in your language to see which reads better to you, and check anything that matters. Machine output in a second language can be fluent and still wrong, especially for names, numbers and legal or medical wording.
How does Mistral compare with the other models in the picker?
Mistral Large 4 is described by Mistral as open-weight, multimodal and general-purpose, with a 1M-token context on its model page.
| Model | Context window | Image input | Source (Nov 2026) |
|---|---|---|---|
| GPT-6.1 Terra | 1.05M | Yes | OpenAI docs |
| Claude Sonnet 5.5 | 1M | Yes | Copilotly catalogue |
| Gemini 4 Argon | 1M | Yes, plus audio, video and PDF | Google AI Studio docs |
| DeepSeek V4 Pro | 1M | No (Flash: yes) | DeepSeek docs |
| Grok 4.7 | 500K | Yes | xAI docs |
| Mistral Large 4 | 1M | Multimodal | Mistral docs |
What open-weight means here
Mistral says the weights are openly available. In Copilotly that changes nothing about how you use it: you pick it in the menu and it runs through Mistral's API. It matters if your organisation cares about where a model comes from or whether it can be self-hosted, which is a decision outside this extension.
Languages
The picker calls it European and multilingual. Mistral's page lists no language support for Large 4, so the honest comparison is one you run: the same paragraph in your language through two models, read by someone fluent.
How do I get better answers from Mistral in the sidebar?
Say the language and register
Ask for a specific language and tone, for example formal French for a customer letter. The rewrite toolbar's tone and length pickers help for shorter edits.
Read both versions side by side
Use bilingual page translation for reading and ask questions about passages that look odd. The original stays on screen.
Keep names, numbers and dates under review
Fluent output can still change a name, a date or a figure. Compare those against the source every time.
Let memory carry your preferences
Put your preferred language and style in custom instructions so you do not repeat them in every chat.
Why would I choose a European model?
Mistral AI is a European company, and Copilotly's picker labels Mistral Large 4 as European. Some people want a second provider for that reason, some for language coverage and some for open weights.
What it changes and what it does not
Picking Mistral in Copilotly does not move your data to Europe by itself. Copilotly sends your message to Mistral's API to answer it, and where that is processed is Mistral's to document. If data location matters to you, read Mistral's own terms and your organisation's policy first.
Reasons that hold up
- A cross-check. A model from a different provider can disagree with the first one in useful ways.
- Open weights. Mistral describes Large 4 as open-weight, which matters if you later want to self-host.
- Your language. If your first language is not English, try it and judge for yourself.
This is general information, not compliance advice.
Does Mistral work in Firefox, Opera and Safari?
Mistral in Firefox comes from the Firefox Add-ons listing. Mistral in Opera uses the Chrome Web Store build, as do Brave, Arc and Vivaldi.
| Where | Status | How |
|---|---|---|
| Chrome | Supported | Chrome Web Store |
| Edge | Supported | Its own Edge Add-ons listing |
| Firefox | Supported | Its own Firefox Add-ons listing |
| Brave | Supported | Installs the Chrome Web Store build |
| Opera | Supported | Installs the Chrome Web Store build |
| Arc, Vivaldi | Supported | Install the Chrome Web Store build |
| Safari | Not yet | There is no Safari build in the App Store |
| iPhone, Android | Supported | The Copilotly iOS and Android apps, which work on the free plan |
Who it is for
Bilingual professionals writing in a second language
Draft in your own language, ask Mistral Large 4 to render it in the other, then read both side by side. Use the rewrite toolbar for tone, and have a fluent colleague check anything formal or contractual. Do not rely on any model alone for legal wording.
Readers of foreign-language news and documents
Open the page and use page translation for the bilingual view, then ask Mistral about a passage that reads oddly. Seeing original and translation together shows where meaning may have shifted.
People who want a non-US model as a second opinion
Mistral AI is a European company. Ask the same question of Mistral Large 4 and a US-built model and compare. Where they disagree, open the source. This is a cross-check, not proof either is right.
Mistral through its own app or through Copilotly
| Mistral's own apps (Vibe, formerly Le Chat) | Mistral in Copilotly | |
|---|---|---|
| Models | Mistral's models | Mistral plus GPT, Claude, Gemini, Grok, DeepSeek |
| Where you use it | Web, iOS, Android (per Mistral, Nov 2026) | Sidebar in any supported browser, web app, iOS, Android |
| Browser extension | We found no official one | Yes, sidebar in Chrome, Edge, Firefox, Brave, Opera |
| Connectors to Slack, GitHub, Jira | Yes, 100+ tools listed by Mistral | No |
| Rewrite selected text on any site | Not its main purpose | Yes, with diff and undo |
| Your own API key | Not how it is used | Yes, unmetered by Copilotly |
| Free to try | Free plan listed by Mistral | Free plan, 10 premium messages a day |
If something goes wrong
I cannot find Le Chat in the extension
Copilotly is not Le Chat, which Mistral now calls Vibe. Mistral's apps run on the web, iOS and Android. Copilotly gives you Mistral's models in a sidebar on any page, without Mistral's tool connectors.
The chat moved to Mistral Small 4
That is the fallback after your 10 daily Mistral Large 4 messages on Free. The count resets daily, and your own Mistral key is never metered.
Replies in my language are weaker than expected
Mistral's model pages make no language claim for Large 4. Try Gemini or Claude on the same text from the model menu, and use whichever reads best to you.
Alt+C does not open the sidebar
Another extension or the browser may be using the same shortcut. In Chrome, Edge and Brave open chrome://extensions/shortcuts (Edge uses edge://extensions/shortcuts) and check what is assigned to Copilotly. In Firefox, open the Add-ons page, use the gear menu and choose Manage Extension Shortcuts.
Guides that go with this
Best AI Copilots by Profession (2026): Honest Picks for 8 Fields
We picked the best AI copilot for 8 professions and use cases in 2026: GitHub Copilot for developers, Microsoft 365 Copilot for office workers, and domain-specific copilots for legal, health, tax, finance, career, and small business questions. Every pick includes real alternatives, honest pricing, and the cases where a different tool wins.
ChatGPT vs Claude vs Gemini: We Tested Real Legal, Medical, and Tax Questions
We put ChatGPT, Claude, and Gemini through dozens of real professional questions covering contract review, lab results, retirement planning, and tax deductions. Each platform showed clear strengths and surprising failure modes, and none of the 3 matched domain-specific copilots for high-stakes guidance.
Common questions
Is this Mistral's official extension?
No. Copilotly is independent and not affiliated with Mistral AI. It uses Mistral models through their API. We found no official Mistral browser extension.
Which Mistral models can I use?
Mistral Large 4 (premium) and Mistral Small 4 (fast).
Can I use Mistral without a subscription?
Yes. The free plan covers Mistral Small 4 and 10 premium-model messages a day, and your own Mistral key works unmetered. A free account is required; a card is not.
Is it good for languages other than English?
Copilotly's picker describes Mistral Large 4 as European and multilingual, but Mistral's model pages do not make a language claim for it. Test it on your own text; the model menu lets you ask the same thing of two models.
Is Le Chat the same as this?
No. Le Chat, which Mistral now calls Vibe, is Mistral's own chat and coding product. Copilotly is a separate extension that runs Mistral's models in a sidebar next to other providers' models.
What is Mistral Small 4 for?
Mistral says it combines instruct, reasoning and coding in one model. In Copilotly it is the compact, quick model on every plan and the fallback when your 10 daily Mistral Large 4 messages on Free are used.
Does Copilotly have Mistral's connectors to Slack, GitHub or Jira?
No. Mistral's product page lists connectors to 100+ tools in its own app. Copilotly works with the page, text and files in front of you and does not connect to those services. If tool connectors are what you need, use Mistral's own app.
Can I use Mistral in Firefox, Opera or Safari?
Copilotly is the same extension across browsers, so Mistral is too. It is listed for Firefox and Edge. Brave and Opera install the Chrome Web Store build, and Arc and Vivaldi do the same. Safari is not supported yet: there is no Safari build in the App Store, so use one of the other browsers on a Mac, or the iOS and Android apps on a phone.
Sources
Keep going
Related
More ai models
Use Mistral on any page
Install the free extension, pick Mistral Large 4 and press Alt+C. No card needed.