chini-004-uber-dispatch
Ride Dispatch (Uber-style matching)
Match riders to drivers in real time. Stay alive when a region's matcher dies.
Source: Classic system-design interview corpus (Uber / Lyft dispatch)
Prompt
Design a real-time ride-dispatch system. Functional: - POST /ride accepts a rider's request (location). - The system matches the rider to a nearby driver and returns the match. - Driver location updates stream in continuously. Non-functional: - A spike in ride requests (rain in a city, end of a concert) at 5x must not collapse matching latency. - If one regional matcher fails, requests in that region must reroute, not drop. - Driver-location ingestion must not back-pressure the matching path. Return a Chinilla CanvasState. You'll likely want separate paths for ingest vs match, a queue between them, and replication or routing for the matcher.
Constraints
- Max components
- 14
- Required behaviors
- queue, retry
- Monthly budget
- $1200
Stress scenarios
Baseline rides
baselineNormal ride-request volume.
5x rush spike
spikeRide volume jumps 5x (concert lets out).
Matcher outage
outageA matching component fails. Requests must reroute.
Driver-location flood
cascadeHeavy location-update traffic with jitter. Must not back-pressure matches.
Pass criteria (overall)
- Min stability score
- 70
- Max drop rate
- 5.0%
- Min delivery rate
- 90.0%
- Max errors
- 5
Submit your run
Submissions go through the chini-bench CLI. It calls your model with your key, scores the result locally, and posts to the leaderboard. Nothing leaves your machine except the canvas it produces.
End-to-end:
pip install git+https://github.com/collapseindex/chini-bench-cli.git
export OPENROUTER_API_KEY=...
chini-bench run chini-004-uber-dispatch \
--provider openrouter --model google/gemini-2.0-flash-001 \
--as aliceOr inspect the prompt first:
chini-bench prompt chini-004-uber-dispatch Providers: openai · anthropic · google · openrouter · ollama
Leaderboard
| Rank | Submitter | Model | Score | Stability | Delivery | Design | Pass |
|---|---|---|---|---|---|---|---|
| #1 | rl_v06_run2 | rl_policy custom single-shot | 89 | 78.0 | 100.0 | 60.0 | ✓ |
| #2 | rl_v06_run2 | rl_policy custom single-shot | 89 | 83.0 | 100.0 | 50.0 | ✗ |
| #3 | rl_v06_run2 | rl_policy custom single-shot | 89 | 82.0 | 94.0 | 75.0 | ✗ |
| #4 | rl_v06_run2 | rl_policy custom single-shot | 89 | 83.0 | 92.0 | 75.0 | ✗ |
| #5 | rl_v06_run1 | rl_policy custom single-shot | 87 | 82.0 | 87.0 | 60.0 | ✗ |
| #6 | rl_v06_run1 | rl_policy custom single-shot | 87 | 73.0 | 100.0 | 60.0 | ✓ |
| #7 | rl_v06_run1 | rl_policy custom single-shot | 87 | 82.0 | 87.0 | 85.0 | ✗ |
| #8 | rl_v06_run2 | rl_policy custom single-shot | 87 | 77.0 | 94.0 | 60.0 | ✗ |
| #9 | rl_v06_run2 | rl_policy custom single-shot | 87 | 83.0 | 92.0 | 35.0 | ✗ |
| #10 | rl_v06_run2 | rl_policy custom single-shot | 87 | 80.0 | 89.0 | 75.0 | ✗ |
| #11 | rl_v06_run2 | rl_policy custom single-shot | 87 | 80.0 | 91.0 | 85.0 | ✗ |
| #12 | rl_v06_run1 | rl_policy custom single-shot | 86 | 76.0 | 100.0 | 60.0 | ✗ |
| #13 | rl_v06_run2 | rl_policy custom single-shot | 86 | 80.0 | 87.0 | 85.0 | ✗ |
| #14 | rl_v06_run1 | rl_policy custom single-shot | 85 | 82.0 | 81.0 | 75.0 | ✗ |
| #15 | rl_v06_run2 | rl_policy custom single-shot | 85 | 80.0 | 100.0 | 25.0 | ✗ |
| #16 | rl_v06_run2 | rl_policy custom single-shot | 85 | 73.0 | 94.0 | 85.0 | ✗ |
| #17 | rl_v06_run2 | rl_policy custom single-shot | 85 | 74.0 | 92.0 | 85.0 | ✗ |
| #18 | rl_v06_run2 | rl_policy custom single-shot | 85 | 75.0 | 92.0 | 70.0 | ✗ |
| #19 | rl_v06_run2 | rl_policy custom single-shot | 85 | 78.0 | 87.0 | 60.0 | ✗ |
| #20 | rl_v06_run2 | rl_policy custom single-shot | 85 | 84.0 | 75.0 | 75.0 | ✗ |
| #21 | rl_v06_run2 | rl_policy custom single-shot | 85 | 84.0 | 75.0 | 75.0 | ✗ |
| #22 | rl_v06_run2 | rl_policy custom single-shot | 85 | 80.0 | 83.0 | 75.0 | ✗ |
| #23 | rl_v06_run2 | rl_policy custom single-shot | 85 | 84.0 | 75.0 | 75.0 | ✗ |
| #24 | rl_v06_run1 | rl_policy custom single-shot | 84 | 77.0 | 84.0 | 60.0 | ✗ |
| #25 | rl_v06_run2 | rl_policy custom single-shot | 84 | 78.0 | 84.0 | 75.0 | ✗ |
| #26 | rl_v06_run1 | rl_policy custom single-shot | 83 | 81.0 | 75.0 | 100.0 | ✗ |
| #27 | rl_v06_run1 | rl_policy custom single-shot | 83 | 77.0 | 83.0 | 85.0 | ✗ |
| #28 | rl_v06_run1 | rl_policy custom single-shot | 83 | 76.0 | 83.0 | 85.0 | ✗ |
| #29 | rl_v06_run1 | rl_policy custom single-shot | 83 | 80.0 | 75.0 | 75.0 | ✗ |
| #30 | rl_v06_run1 | rl_policy custom single-shot | 83 | 80.0 | 75.0 | 85.0 | ✗ |
| #31 | rl_v06_run2 | rl_policy custom single-shot | 83 | 81.0 | 75.0 | 60.0 | ✗ |
| #32 | rl_v06_run2 | rl_policy custom single-shot | 83 | 83.0 | 70.0 | 75.0 | ✗ |
| #33 | rl_v06_run2 | rl_policy custom single-shot | 83 | 71.0 | 100.0 | 50.0 | ✗ |
| #34 | rl_v06_run2 | rl_policy custom single-shot | 83 | 81.0 | 75.0 | 60.0 | ✗ |
| #35 | alex | anthropic/claude-sonnet-4.6 default single-shot | 82 | 72.0 | 88.0 | 100.0 | ✗ |
| #36 | rl_v06_run1 | rl_policy custom single-shot | 82 | 80.0 | 74.0 | 75.0 | ✗ |
| #37 | rl_v06_run2 | rl_policy custom single-shot | 82 | 79.0 | 75.0 | 75.0 | ✗ |
| #38 | rl_v06_run1 | rl_policy custom single-shot | 81 | 76.0 | 92.0 | 25.0 | ✗ |
| #39 | rl_v06_run1 | rl_policy custom single-shot | 81 | 77.0 | 75.0 | 75.0 | ✗ |
| #40 | rl_v06_run2 | rl_policy custom single-shot | 81 | 80.0 | 78.0 | 60.0 | ✗ |
| #41 | rl_v06_run2 | rl_policy custom single-shot | 81 | 72.0 | 83.0 | 100.0 | ✗ |
| #42 | rl_v06_run2 | rl_policy custom single-shot | 81 | 81.0 | 75.0 | 60.0 | ✗ |
| #43 | rl_v06_run1 | rl_policy custom single-shot | 80 | 80.0 | 74.0 | 35.0 | ✗ |
| #44 | rl_v06_run2 | rl_policy custom single-shot | 80 | 80.0 | 67.0 | 75.0 | ✗ |
| #45 | rl_v06_run2 | rl_policy custom single-shot | 80 | 84.0 | 75.0 | 50.0 | ✗ |
| #46 | alex | google/gemini-3.1-pro-preview default reflexion | 79 | 73.0 | 75.0 | 100.0 | ✗ |
| #47 | rl_v06_run2 | rl_policy custom single-shot | 79 | 83.0 | 75.0 | 50.0 | ✗ |
| #48 | rl_v06_run2 | rl_policy custom single-shot | 79 | 75.0 | 71.0 | 85.0 | ✗ |
| #49 | rl_v06_run2 | rl_policy custom single-shot | 79 | 72.0 | 75.0 | 60.0 | ✗ |
| #50 | rl_v06_run1 | rl_policy custom single-shot | 77 | 83.0 | 69.0 | 25.0 | ✗ |
| #51 | rl_v06_run2 | rl_policy custom single-shot | 77 | 69.0 | 75.0 | 85.0 | ✗ |
| #52 | rl_v06_run2 | rl_policy custom single-shot | 77 | 78.0 | 75.0 | 25.0 | ✗ |
| #53 | rl_v06_run2 | rl_policy custom single-shot | 77 | 69.0 | 75.0 | 100.0 | ✗ |
| #54 | rl_v06_run1 | rl_policy custom single-shot | 76 | 76.0 | 75.0 | 25.0 | ✗ |
| #55 | rl_v06_run2 | rl_policy custom single-shot | 75 | 77.0 | 55.0 | 60.0 | ✗ |
| #56 | rl_v06_run2 | rl_policy custom single-shot | 74 | 86.0 | 38.0 | 60.0 | ✗ |
| #57 | rl_v06_run1 | rl_policy custom single-shot | 72 | 77.0 | 46.0 | 85.0 | ✗ |
| #58 | alex | x-ai/grok-4.20 default reflexion | 69 | 38.0 | 100.0 | 100.0 | ✗ |
| #59 | alex | openai/gpt-5.4 default reflexion | 68 | 44.0 | 100.0 | 100.0 | ✗ |
| #60 | rl_v06_run1 | rl_policy custom single-shot | 68 | 81.0 | 25.0 | 75.0 | ✗ |
| #61 | alex | openai/gpt-5.4 default single-shot | 53 | 65.0 | 0.0 | 75.0 | ✗ |
| #62 | alex | anthropic/claude-sonnet-4.6 default reflexion | 46 | 0.0 | 100.0 | 100.0 | ✗ |
| #63 | rl_v06_run2 | rl_policy custom single-shot | 46 | 51.0 | 0.0 | 35.0 | ✗ |
| #64 | rl_v06_run2 | rl_policy custom single-shot | 36 | 32.0 | 0.0 | 45.0 | ✗ |
| #65 | alex | x-ai/grok-4.20 default single-shot | 33 | 26.0 | 0.0 | 75.0 | ✗ |
| #66 | rl_v06_run2 | rl_policy custom single-shot | 33 | 25.0 | 0.0 | 35.0 | ✗ |
| #67 | alex | google/gemini-3.1-pro-preview default single-shot | 30 | 19.0 | 0.0 | 100.0 | ✗ |
Per-scenario breakdown of the top run
| Scenario | Health | Drop rate | Delivered | Pass |
|---|---|---|---|---|
| baseline | 81.0 | 0.0% | 300 | ✓ |
| rush-spike | 80.0 | 0.0% | 1500 | ✓ |
| matcher-outage | 71.0 | 0.0% | 72 | ✓ |
| ingest-pressure | 80.0 | 0.0% | 300 | ✓ |