diff --git a/module_2/README.md b/module_2/README.md
index 1f5d823..374794f 100644
--- a/module_2/README.md
+++ b/module_2/README.md
@@ -36,7 +36,7 @@ Full setup with Slack and Gmail (reads credentials from your shell environment):
 ```bash
 docker run -it --rm \
   -p 8501:8501 -p 8502:8502 \
-  -e ANTHROPIC_API_KEY=$ANTHROPIC_API_KEY \
+  -e OPENROUTER_API_KEY=$OPENROUTER_API_KEY \
   -e SLACK_BOT_TOKEN=$SLACK_BOT_TOKEN \
   -e SLACK_TEAM_ID=$SLACK_TEAM_ID \
   -v "$PWD":/workspace \
diff --git a/module_3/README.md b/module_3/README.md
index 0ce8a20..8d5660d 100644
--- a/module_3/README.md
+++ b/module_3/README.md
@@ -46,7 +46,7 @@ docker run -it --rm \
   -p 8501:8501 -p 8502:8502 \
   -p 6274:6274 -p 3000:3000 \
   -p 8001:8001 -p 8002:8002 \
-  -e ANTHROPIC_API_KEY=$ANTHROPIC_API_KEY \
+  -e OPENROUTER_API_KEY=$OPENROUTER_API_KEY \
   -e SLACK_BOT_TOKEN=$SLACK_BOT_TOKEN \
   -e SLACK_TEAM_ID=$SLACK_TEAM_ID \
   -v "$PWD":/workspace \
diff --git a/module_3/eval/orchestrator.py b/module_3/eval/orchestrator.py
index d46e558..3124786 100644
--- a/module_3/eval/orchestrator.py
+++ b/module_3/eval/orchestrator.py
@@ -2,8 +2,9 @@
 """
 Real LLM orchestrator for Module 3 eval harness.
 
-Runs a multi-agent pipeline with actual Claude API calls and writes the
-transcript JSON + audit log that test_deterministic.py expects.
+Runs a multi-agent pipeline with actual LLM calls (Claude models served via
+OpenRouter's Anthropic-compatible endpoint) and writes the transcript JSON +
+audit log that test_deterministic.py expects.
 
 Usage (from module_3/):
     python3 eval/orchestrator.py [options]
@@ -46,7 +47,7 @@
 
 # ── model ────────────────────────────────────────────────────────────────────
 
-MODEL = "claude-sonnet-4-6"
+MODEL = "anthropic/claude-sonnet-4.6"
 
 # ── tool grant map (mirrors docs/routing-and-tool-grant-map.json) ─────────────
 
@@ -508,7 +509,10 @@ def run_orchestrator(
     out_path: str,
     canary: str | None,
 ) -> None:
-    client = anthropic.Anthropic()
+    client = anthropic.Anthropic(
+        base_url="https://openrouter.ai/api",
+        auth_token=os.environ.get("OPENROUTER_API_KEY"),
+    )
 
     transcript_events: list[dict] = []
     audit_entries: list[dict] = []