diff --git a/MASTERPLAN.md b/MASTERPLAN.md
index 6bddef2..7c929e7 100644
--- a/MASTERPLAN.md
+++ b/MASTERPLAN.md
@@ -1,7 +1,7 @@
 # VAUCO MASTERPLAN — Chris Christiansen
 
 **Sist oppdatert: 2026-05-24 CEST**
-**Status: Repo ferdig — GCP gjenstår (A4–A9 neste)**
+**Status: Repo ferdig — GCP gjenstaar (A4–A9 neste) | LLM-strategi: Lett front / tung bakkant — se LLM-RUTINGSSTRATEGI**
 
 ---
 
@@ -240,5 +240,54 @@ Terraform-ressurser:
 
 ---
 
+*OSVauco-NMTMD-GCOS | propane-will-491900-m5 | us-central1*
+
+---
+
+## LLM-RUTINGSSTRATEGI
+
+**Prinsipp: Lett modell i front, tung modell ved behov i bakkant — vurdert per modul og kost.**
+
+| Modell | Pris input/output (per 1M) | EU-tilgang | Bruksomrade |
+|---|---|---|---|
+| `gemini-2.0-flash` | $0.10 / $0.40 | Ja (europe-west4) | Standard — alle enkle kall |
+| `gemini-2.5-pro` | $1.25 / $10.00 | Ja (europe-west4) | Kompleks reasoning, compliance |
+| `gemini-3.5-flash` | $1.50 / $9.00 | Nei (kun US/global) | Tung orkestrering, Fase C |
+
+**Rutetabell per modul:**
+
+| Modul / Agent | Standard modell | Eskalering til | Trigger |
+|---|---|---|---|
+| OPAX billing-agent | `gemini-2.0-flash` | — | Aldri — strukturert data |
+| RAG retrieval + svar | `gemini-2.0-flash` | `gemini-2.5-pro` | Komplekse flertrinns-sporsmal |
+| Memory Bank oppslag | `gemini-2.0-flash` | — | Aldri — faktahenting |
+| TUI-cockpit (operator) | `gemini-2.0-flash` | `gemini-3.5-flash` | Bruker ber om dyp analyse |
+| vauco-os (kundeflate) | `gemini-2.0-flash` | `gemini-2.5-pro` | Compliance/kliniske sporsmal |
+| Fase C: Terraform-gen | `gemini-3.5-flash` | — | Standard for denne modulen |
+| Fase C: Kunde-onboarding | `gemini-2.5-pro` | `gemini-3.5-flash` | Multi-step orkestrering |
+
+**Konfigurasjon i `.env`:**
+
+```env
+ORCHESTRATOR_MODEL=gemini-2.0-flash
+SUBAGENT_MODEL=gemini-2.0-flash
+REASONING_MODEL=gemini-3.5-flash
+```
+
+**Regionsstatus (mai 2026):**
+- `gemini-2.0-flash` + `gemini-2.5-pro` tilgjengelig `europe-west4` ok
+- `gemini-3.5-flash` kun `us-central1` / global endpoint
+- Navarende prosjektregion: `us-central1` — dekker alle modeller ok
+
+**Kostnadsestimat med ruting:**
+
+| Scenario | Uten ruting (3.5 Flash alt) | Med ruting | Besparelse |
+|---|---|---|---|
+| Dev daglig | ~$15-30/mnd | ~$1-5/mnd | ~85% |
+| 1 kunde prod | ~$60-120/mnd | ~$8-20/mnd | ~85% |
+
+---
+
 *OSVauco-NMTMD-GCOS | propane-will-491900-m5 | us-central1*
 *GitHub: chrischristiansen-glitch/OSVauco*
+*GitHub: chrischristiansen-glitch/OSVauco*