Infinithink AI Chat
The all-in-one AI assistant with Claude, GPT and Gemini
One chat, several AI models. Draft, analyze, summarize and translate, switch to the model that fits each task, and bring your own documents and images into the conversation.
One account, several AI models
Each provider's own app gives you only its own models. The Infinithink all-in-one AI assistant lets you pick the model for each job, with one login and one bill in euros. Models from OpenAI, Anthropic and Google, depending on your plan.
- GPT
- Claude
- Gemini
Why multi-model AI matters
Models differ in writing style, in how much text they can take in at once and in how they work through a problem. With two or three on hand, you can compare answers instead of settling for the first one. Choose the model from the selector at the top of the chat, for example GPT for a short email reply and Claude for a long contract review.
| Model family | Provider | Often used for |
|---|---|---|
| GPT | OpenAI | Everyday drafts and quick replies |
| Claude | Anthropic | Long documents and careful editing |
| Gemini | Long source material and analysis |
The table scrolls sideways on small screens. Use the arrow keys when it has focus.
Every plan, Free included, uses Claude Sonnet 5.5 and the standard GPT models. Gemini comes from Lite, GPT-6 Sol from Starter, and Business adds the most capable Claude and GPT models. The exact list for each plan is on the AI model comparison page.
Claude for business
Infinithink includes Anthropic's Claude next to GPT on every plan, Free included, and Business adds its most capable version. Want Claude AI chat with business tools and Brand Voice built in? It's here, and on Business your whole team shares it.
Chat with PDF, Word and CSV files
Upload a PDF, a Word document (DOC or DOCX) or a CSV file and ask for what you need: a summary, the key dates, a clause, the totals or the points that need a decision. Use chat with PDF for contracts, reports, price lists and manuals. The answers come from the file you upload, so you can check them against the source.
Excel and PowerPoint files aren't supported, so export them to PDF or CSV first. Check the answer against the original before you rely on it. The assistant reads the file, it doesn't give legal advice. Chat with documents and images is included from the Starter plan.
What you can do with an all-in-one AI assistant
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Ask about images
AI Vision reads images. Upload a photo of a shop window, a screenshot of a dashboard or a chart from a report, and ask what it shows, what's missing or how to describe it in text.
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Create images in the chat
Ask for a new image right in the conversation, then take it further with the AI image generator.
AI image generator, Create images in the chat -
Assistants
Preset roles with their own instructions, for example a marketing assistant or a customer support assistant. Pick one, or start from a blank chat.
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Chat history
Your conversations are saved in your history, so you can return to a thread and continue where you left off.
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Draft, summarize and translate
Replies to customers, summaries of long texts, translations between English, Italian and other languages, ideas for your next newsletter.
Where your data goes
When you send a message, your text and any file you attach go to the provider of the model you picked (OpenAI for GPT, Anthropic for Claude, Google for Gemini), which generates the answer. We access these providers through their paid business APIs, which don't use your content to train their models by default. We don't use it to train models either.
Don't paste data you aren't allowed to share, such as passwords, health information or customers' personal details without a legal basis.
A business workspace, not a personal chat
ChatGPT Plus is OpenAI's plan for individuals, built around OpenAI's own models. Infinithink is a business workspace, with models from OpenAI, Anthropic and Google depending on your plan, writing templates and Brand Voice, image and voice tools, and up to 10 seats on Business. If you only need OpenAI's chat for yourself, ChatGPT Plus may be all you need. If you want several models and business tools in one place, see the full comparison.
Compare before you choose
- ChatGPT alternative Compare ChatGPT plans with Infinithink: GPT, Claude and Gemini by plan, writing templates, team seats and prices in euros, with dated sources.
- TypingMind alternative, for chat apps with your own API keys Skip the API keys. Compare TypingMind with Infinithink, where GPT, Claude and Gemini come included by plan, with templates, team seats and prices in euros.
- AI model comparison Which AI models each Infinithink plan includes, what each does best for writing, analysis and images, and how to switch. Start free.
FAQ
Can I use Claude, GPT and Gemini with one subscription?
Yes, on every plan. Free uses Claude Sonnet 5.5 and the standard GPT models, Lite adds Gemini, Starter adds GPT-6 Sol, and Business adds the most capable models. You choose the model in each chat. See the AI model comparison for the exact list.
Can I chat with a PDF?
Yes, from the Starter plan. Upload a PDF, DOC, DOCX or CSV file and ask questions about it. Excel and PowerPoint files need to be exported to PDF or CSV first.
Can I compare two models?
Yes. Open a new chat, pick another model and send the same message, then keep the answer you prefer.
What shouldn't I paste into an AI chat?
Passwords, API keys, payment details, and personal or health data you don't have a legal basis to share. Remove names when the task doesn't need them.
Is there a free AI chat?
Yes. The Free plan includes AI Chat with Claude Sonnet 5.5 and the standard GPT models, plus monthly credits. You register with your email, no credit card required. Paid plans add Gemini, document chat and more credits.
Try the all-in-one AI assistant
Start on the Free plan and move to more capable models when your work needs them.