The city produced 200 schedule files from the CPRA — every monthly construction schedule update from Feb 2022 through Aug 2025, plus the underlying Primavera P6 source files. 188 MB of stuff.
Ran three different LLMs (Claude, Codex, Gemini) over the documents in parallel as independent analysts, then merged. Got back a structured RCA with 10 candidate causes, three of which are dominant: a subcontractor default in late 2023, an RFI thread that sat on the critical path for 9 months in 2024, and a 14-month escalation lag before the city issued a Notice of Material Breach.
Honest part: I’d have read ten of those PDFs and given up. Doing real forensics on 200 of them in a week wasn’t possible for an unpaid citizen before.