The AI
Time Machine
Talk to AI from the past. Chat with language models whose knowledge stops at specific dates — and discover what the world knew then.
"What did AI know in 2020? Ask it yourself."
Three steps to the past
Pick a year
Choose from our library of time-locked AI models spanning 2018 to 2024.
Start a conversation
Ask anything. The AI only knows what the world knew up to that date.
Explore & compare
Run the same prompt across different years. Watch knowledge evolve in real time.
See it in action
Select a year and watch a sample conversation unfold. Each model only knows what the world knew at that point in time.
↑ Live demo — select a year to see sample conversations
Built for people who
need to know when
Researchers
Study how AI knowledge and capabilities evolved over time. Compare outputs across eras for academic papers.
Journalists
Verify what was known and when. Fact-check historical claims against the AI knowledge of that period.
AI Enthusiasts
Explore how language models evolved year by year. Compare predictions, capabilities, and blind spots across eras.
Educators
Teach students how rapidly AI and world knowledge evolves. Create interactive history lessons.
Curious Minds
Relive the past. Ask an AI from 2018 about crypto, or one from 2020 about the pandemic as it unfolded.
Simple, transparent pricing
Start free. Upgrade when you need more.
No credit card required
- ✓10 messages per day
- ✓3 models: 2020, 2022, 2024
- ✓Basic conversation history
Unlimited access for individuals
- ✓Unlimited conversations
- ✓All models: 2018–2024
- ✓Side-by-side comparison
- ✓Export & share conversations
- ✓Priority support
For teams up to 5 members
- ✓Everything in Pro
- ✓5 team seats included
- ✓Shared conversation library
- ✓API access included
- ✓Admin dashboard
Why historical AI perspectives matter
AI doesn't just change — it forgets. Every time a model is updated, its previous worldview disappears. What did AI "think" about the pandemic in March 2020? What did it know about crypto before the crash? Those perspectives are gone.
Epoch preserves them. We maintain time-stamped language models — each one frozen at a specific point in history. They don't know what happens next. They can't retroactively adjust their knowledge. They are honest snapshots of AI understanding at that moment.
For researchers studying AI evolution, journalists fact-checking timelines, educators teaching history, or anyone curious about how knowledge compounds — Epoch is a window into the past that never closes.
GPT-1 released. AI could barely write a paragraph.
GPT-3 arrives. COVID reshapes every conversation.
ChatGPT goes viral. AI enters the mainstream.
Multimodal models. AI reasons, codes, creates.
The past has answers.
Start asking.
Join researchers, journalists, and curious minds exploring what AI knew — and when it knew it.
Get started with Epoch →