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Settings · Model routing
Bring your own key

You pay the models.
We don't resell their tokens.

History Lesson runs on four specialised agents. Pick a provider for each — or paste the keys you already have and we'll route the work automatically. Keys stay sealed in your encrypted session cookie; they're never written to disk server-side.

Providers connected
0 / 2
Storage
Session cookie
Avg lesson cost
~$0.14
01

Connect providers

AI Gateway
Vercel · routes every provider
Using env var
vck_
Docs · vercel.com/docs/ai-gatewayFalls back to AI_GATEWAY_API_KEY env when empty
K
Kling AI
Direct · default videographer · JWT-signed
Not set
ak
sk
Get keys · app.klingai.com/global/devkling-v2-6 · v2-5-turbo · v2-1 · v1-6
B
ByteDance ModelArk
Direct · Seedance family · bearer token
Not set
ark_
Get a key · console.byteplus.com/arkseedance-2.0 · 1.5-pro · 1.0-pro · 1.0-lite
ElevenLabs
Voices · 2 models
Not set
Get a key · elevenlabs.io/app/settings/api-keyseleven_multilingual_v2 · eleven_v3
OpenAI
Teleport panoramas (gpt-image-2) · 1 models
Not set
sk-
Get a key · platform.openai.com/api-keysgpt-image-2
02

Route the agents

Curator
Searches the web for topics that happened on a date.
!
Trailer writer
Writes the cinematic teaser that fades in over the stage while the lesson generates.
!
Fact checker
Builds the cast roster and physics rules every visual step must respect.
!
Narrative planner
Designs the arc — lens, crisis, stakes, thesis — before the narrator writes.
!
Narrator
Writes the story from primary sources and calibrates tone to age.
!
Voice
Reads the story aloud as the video plays.
!
Camera crew
Decides the scene imagery, visual style and direction.
!
Concurrent keyframes
4
Higher = faster. Image providers usually allow 4–6 in parallel; bump this up if your quota permits.
Videographer
Creates the clips, builds the scene, and delivers movie magic.
!
Concurrent clips
2
Kling standard plans trip at 4–5/min. Lower this if you hit rate limits, raise it if you have headroom.
Human detector
Vision call to detect if scene contains a person. Ensures moderation and proper scene generation.
!
World planner
Builds the interactive historical World, landmarks, people, places and events.
!
Teleporter
Picks scenes with best teleportation possibility. Generates a portal to that time in history.
!
ElevenLabs voice ID
Paste any voice_id from your ElevenLabs library — your key, your voices. The quick-picks below are just ElevenLabs' public defaults.
George · British gentleman
Quick picks
03

Visual fidelity

Default video fidelity
New lessons use this fidelity. You can override it on the topic picker screen before each lesson.
StorytellingHyper-real
Keys are encrypted in your session cookie and never written to disk server-side.