diff --git a/benchmarks/_chart/templates/job.yaml b/benchmarks/_chart/templates/job.yaml
index 98bbcef0..2b8a22ab 100644
--- a/benchmarks/_chart/templates/job.yaml
+++ b/benchmarks/_chart/templates/job.yaml
@@ -24,7 +24,7 @@ spec:
       {{- end }}
       containers:
         - name: otelcol
-          image: {{ .Values.registry }}/core/otel:latest
+          image: {{ .Values.registry }}/core{{ .Values.registrySuffix }}otel:latest
           imagePullPolicy: IfNotPresent
           ports:
             - { name: otlp-grpc, containerPort: 4317 }
@@ -34,7 +34,7 @@ spec:
             - { name: output, mountPath: /output }
 
         - name: gateway
-          image: {{ .Values.registry }}/models/{{ .Values.gatewayImage }}:{{ .Values.gatewayTag }}
+          image: {{ .Values.registry }}/models{{ .Values.registrySuffix }}{{ .Values.gatewayImage }}:{{ .Values.gatewayTag }}
           imagePullPolicy: IfNotPresent
           ports:
             - { name: gateway, containerPort: 4000 }
@@ -60,7 +60,7 @@ spec:
             {{- end }}
 
         - name: runner
-          image: {{ .Values.registry }}/evals/{{ .Values.benchmark }}--{{ .Values.agent }}:{{ .Values.runnerTag }}
+          image: {{ .Values.registry }}/evals{{ .Values.registrySuffix }}{{ .Values.benchmark }}--{{ .Values.agent }}:{{ .Values.runnerTag }}
           imagePullPolicy: IfNotPresent
           command: ["/bin/bash", "-c"]
           # $? / $rc are the container's shell — Helm leaves them untouched
diff --git a/benchmarks/_chart/values.yaml b/benchmarks/_chart/values.yaml
index 306b29ad..6fb3b1d1 100644
--- a/benchmarks/_chart/values.yaml
+++ b/benchmarks/_chart/values.yaml
@@ -7,6 +7,12 @@
 agent: claude-code
 task: "0"
 registry: quay.io/eval-containers
+# Separator between an image's category and name. "/" keeps the nested refs
+# (registry/core/otel). A flattened internal registry (e.g. an OpenShift
+# imagestream) sets "-" so each image collapses to registry/core-otel — set it
+# once in a platform overlay (deploy/values-openshift.yaml). Mirrors the
+# REGISTRY_SUFFIX build-arg on the Dockerfiles (PR #23).
+registrySuffix: "/"
 # The gateway is a fixed proxy image; `evalModel` is the upstream it proxies to
 # (CLI --model sets evalModel + model). `model` is the runner's logging tag.
 gatewayImage: gpt-5.4--bifrost