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Every new account gets 3 days of free access to selected models — no credit card needed. You get 25 messages per day to explore the workspace, try different modes, and see how AiFuse works. After your trial, add funds to unlock all models and providers. Messages start at half a cent, and you'll see the exact cost after each response. There are no subscriptions — your balance is yours to use at your own pace.

• Be specific.
  ❌ "Write something about marketing"
  ✅ "Write a 200-word LinkedIn post about email marketing trends for B2B SaaS, professional tone"
• Provide context.
  ❌ "Is this a good price?"
  ✅ "I'm comparing cloud hosting in Europe for a small SaaS app with ~1000 users. Is €49/month for a 4-core VPS a good price?"
• Assign a role.
  ❌ "Help me with this code"
  ✅ "You are a senior Python developer. Review this function for performance issues and suggest improvements"
• One chat per subject. Start a new conversation when you change topics — it keeps responses focused and avoids confusing the model with unrelated history.
• Break down complex tasks. Instead of "Build me a full website," start with "Design the navigation structure," then "Write the homepage copy," then "Create the CSS layout." Step by step gets better results.
• Iterate. If the first answer isn't right, refine your prompt rather than starting over. Tell the AI what to change: "Make it shorter," "More formal tone," "Focus on the cost comparison."
• Context limits. Every AI model has a context limit. Very long conversations may lose earlier messages — start fresh when things get long.

Single is the default. You pick one model, have a conversation, and switch to a different model anytime — even mid-conversation. Your chat history stays intact when you switch. Different models have different strengths — some are better at coding, others at writing or analysis. Experiment and use what works best for each task. Simple, fast, and the cheapest way to work.

Duo sends your prompt to two models at the same time. You see both responses side by side, pick the one you prefer, and that response becomes the conversation context for your next message. It's useful when you want a second opinion, when you're not sure which model handles a topic best, or when quality matters more than speed.

Example: You ask both models to write a function that validates an email address. Each model takes a different approach — select the one you prefer and continue building on it.

Fusion pairs two models on every message. You choose two AIs — an orchestrator and a consultant. Both respond to your prompt in parallel, then the orchestrator refines the final answer using the consultant's perspective. You get a single, polished response — stronger than either model alone. Use it when you want the best possible answer and don't mind the extra cost.

Example: You ask a question about a legal contract. Both models analyze it independently, then the orchestrator combines the best insights from the consultant into one comprehensive answer — catching things either model might have missed alone.

Incognito mode lets you chat without saving anything to your history. When enabled, your messages and responses are not stored — once you close or leave the conversation, they're gone. You can toggle Incognito on or off at any time from the input bar, even mid-conversation. Messages sent before turning it on remain in your history — Incognito applies from the moment you enable it. The setting is global across all modes and resets when you refresh the page. Note that usage and costs are still tracked for billing purposes — Incognito controls history, not billing.

Context controls how much conversation history is sent to the AI with each message. More context means the AI remembers more of your conversation, but costs more since you're sending more tokens.

AiFuse offers four levels:

Each mode has a different default:

You can change the context level at any time from the dropdown next to the model selector. The cost difference between Economy and Quality can be 3–4x on longer conversations. If the AI starts forgetting earlier details, try a higher context level — or start a fresh conversation.

Duo has two sub-modes depending on context: with None selected, each message is a standalone comparison — the models don't see previous messages. Select Economy, Balanced, or Quality and Duo switches to interactive mode — you pick your preferred reply each turn, and that response becomes the shared context for the next message.

Context vs Incognito: These are independent settings. Context controls how much history the AI sees. Incognito controls whether your conversation is saved. You can use both together — for example, Balanced context with Incognito on means the AI sees recent history during the session, but nothing is saved when you leave.

AiFuse uses a prepaid balance — no subscriptions, no recurring charges. You top up a minimum of $10 and use it at your own pace. Before each message, AiFuse estimates the maximum cost and checks your balance. If it's too low, the request won't run. After the response completes, you're charged the actual cost. The exact cost appears below every response so you always know what you spent. Messages start at half a cent, and your balance never expires.

• Your prompts are sent only to the AI provider you select — nothing is shared across providers or used for advertising.
• Payment is handled entirely by Stripe — AiFuse never sees or stores your card details or address information. The less we know about you, the better you're protected.
• Incognito mode lets you chat without saving history — conversations only live in memory and are gone when you leave or refresh.
• Don't paste sensitive information like passwords, financial details, or personal identifiers into prompts — while AiFuse doesn't store them, the AI provider will process them.

For full details, see our Privacy Policy.

This section will grow as we learn from real usage. For now:

• Message didn't send: Your balance may be too low for the estimated cost. Check your balance and top up if needed.
• AI forgot earlier details: Your context level might be too low. Try switching to a higher level or start a fresh conversation.
• Response seems wrong or incomplete: Try a different model — each has different strengths. Or rephrase your prompt with more detail.
• Costs seem higher than expected: Long conversations on Quality context cost more. Switch to Economy for simple tasks, or start a new conversation to reset the context.

Found a bug, want to request a new model, or have ideas for improvement?
Contact us and we'll help sort it out.