One prompt. Every model.
Send a single prompt to GPT-4o, Claude, Gemini, and Mistral simultaneously. Watch them race to answer, compare side by side, crown the best response — or merge all four into one synthesized reply.
See it in action
Swipe or use arrows to explore the app screens
Chat Console — Fan-out view
Four models racing to answer your prompt in real time
Placeholder frames — real screenshots drop into public/screens/
Watch the fan-out
See four models race to answer a single prompt in real time
Drop demo.mp4 into public/ to activate
Ready to stop tabbing between ChatGPT, Claude, and Gemini?
Everything in one console
No more switching tabs. No more copy-pasting prompts. One interface, every answer.
Live Fan-Out
Send one prompt and watch GPT-4o, Claude, Gemini, and Mistral race to answer — each streaming char-by-char with their own latency timer.
Side-by-Side Compare
True column layout on wide screens, horizontal-scroll cards on mobile. Every model's response visible at once — no tabbing, no guessing.
Crown the Winner
Vote for the best response per turn. Winners are highlighted, recorded in history, and used to surface which model performs best on your prompts.
Synthesized Merge
Flip to Merged view and get a single SYNTHESIS card that pulls the strongest points from all four models into one coherent answer.
Full History
Every conversation is saved with model count, vote records, and full transcripts. Sidebar on wide web, full-screen drawer on phone.
How it works
Coming soon: AI that judges AI
The current app mocks model responses. Here's what real AI integration unlocks.
AI-Ranked Responses
PlannedA meta-model judges quality, hallucination risk, and reasoning depth — ranking responses before you even read them.
Personal Model Leaderboard
PlannedTrack your voting history across 100s of prompts. Discover which model wins on code vs. creative vs. analysis — personalized to your use case.
Smart Routing
PlannedThe app learns which models you prefer for different task types and pre-selects the best lineup for your next prompt automatically.
Auto-Synthesis Quality Scoring
PlannedAI grades the merged output against each source response, flagging contradictions and confidence gaps before you act on the synthesis.
Shape the roadmap — tell us which AI feature matters most to you.
100 apps. 100 hours. Live on socials.
We're building combine.ai — and 99 other apps — in real time. Every build is screen-recorded and posted. Follow along, vote for features, and be there when we ship.
Don't just watch — get early access
Waitlist members get first access when combine.ai launches, plus input on which AI features ship first.