87ns
Per-record sensitivity propagation
Measured against a 4-arg typed DAG, warm cache, single-record perturbation. Methodology and reproducer in the bench file.
bench · commit 46a6328Proof
Every number on this site
points to an artifact.
When the Heartbeat says 87 ns per sensitivity, this is the file the number comes from. When we say bit-identical, this is the test that checks it. When we say 100/100 rubric, this is what the rubric grades on.
Artifacts
1,024drivers
Largest validated DAG
Cold + warm compile sweep across 50 / 200 / 500 / 1000 drivers. 1,024-driver case runs under one second cold.
bench · scale-warm100/ 100
Institutional Excel-export rubric
Six dimensions, 100 points total, 90-point institutional pass threshold. Production exports score 100/100 on the SaaS, DTC, and LBO institutional test models.
rubric · six-sheet test →bit-identical
Same IR always produces same outputs
The compile pipeline is a pure function over the IR: same input, same output, every machine, every run. No floating-point drift across cold and warm caches; no platform variance between macOS arm64 and Linux amd64 in our CI matrix.
determinism guaranteebothday one
MCP + REST surfaces
MCP endpoint at api.flatlandfi.com/mcp · REST endpoint at api.flatlandfi.com/api · same engine, two protocols. Live discovery at /.well-known/oauth-protected-resource.
API reference →50/ month, free
Free tier baseline
50 answers per calendar month per API key. No card required. Two free API keys per account. Resets on the first of the calendar month.
pricing detail →single-digit ms warm
Compile latency
50-driver compile, warm cache, runs in single-digit milliseconds on commodity hardware. Cold compile takes longer because the parser and type system warm up. The bench script in the repo is reproducible.
bench · 50-driver✓by architecture
Tenant isolation
Per-key authentication boundary. Each API key is a logical tenant. Cross-tenant access is architecturally impossible; no shared model store exists that two keys can both read from.
security posture →Flatland · index of everything
Comparisons
Disasters
© 2026 Flatland · made for systems of record · live pulse · awaiting first compile