diff --git a/src/core/client/admin/routes/Configure/sections/Moderation/PerspectiveConfig.tsx b/src/core/client/admin/routes/Configure/sections/Moderation/PerspectiveConfig.tsx
index 0d3989dd1..3a3b250c7 100644
--- a/src/core/client/admin/routes/Configure/sections/Moderation/PerspectiveConfig.tsx
+++ b/src/core/client/admin/routes/Configure/sections/Moderation/PerspectiveConfig.tsx
@@ -5,6 +5,10 @@ import { Field } from "react-final-form";
 
 import { formatPercentage, parsePercentage } from "coral-framework/lib/form";
 
+import {
+  TOXICITY_MODEL_DEFAULT,
+  TOXICITY_THRESHOLD_DEFAULT,
+} from "coral-common/constants";
 import { ExternalLink } from "coral-framework/lib/i18n/components";
 import {
   composeValidators,
@@ -32,9 +36,6 @@ import APIKeyField from "./APIKeyField";
 
 import styles from "./PerspectiveConfig.css";
 
-/* TODO: use a common constants for both client and server. */
-const TOXICITY_DEFAULT = 80;
-
 interface Props {
   disabled: boolean;
 }
@@ -69,7 +70,7 @@ const PerspectiveConfig: FunctionComponent<Props> = ({ disabled }) => {
 
       <FormField container={<FieldSet />}>
         <Localized id="configure-moderation-perspective-filter">
-          <InputLabel container="legend">Spam Detection Filter</InputLabel>
+          <InputLabel container="legend">Toxic Comment Filter</InputLabel>
         </Localized>
         <OnOffField
           name="integrations.perspective.enabled"
@@ -85,12 +86,12 @@ const PerspectiveConfig: FunctionComponent<Props> = ({ disabled }) => {
         </Localized>
         <Localized
           id="configure-moderation-perspective-toxicityThresholdDescription"
-          $default={TOXICITY_DEFAULT}
+          $default={TOXICITY_THRESHOLD_DEFAULT + "%"}
         >
           <InputDescription>
             This value can be set a percentage between 0 and 100. This number
             represents the likelihood that a comment is toxic, according to
-            Perspective API. Defaults to $default.
+            Perspective API. By default the threshold is set to $default.
           </InputDescription>
         </Localized>
         <Field
@@ -113,7 +114,7 @@ const PerspectiveConfig: FunctionComponent<Props> = ({ disabled }) => {
                 autoCapitalize="off"
                 spellCheck={false}
                 adornment={<Typography variant="bodyCopy">%</Typography>}
-                placeholder={TOXICITY_DEFAULT.toString()}
+                placeholder={TOXICITY_THRESHOLD_DEFAULT.toString()}
                 textAlignCenter
               />
               {meta.touched && (meta.error || meta.submitError) && (
@@ -126,6 +127,53 @@ const PerspectiveConfig: FunctionComponent<Props> = ({ disabled }) => {
         </Field>
       </FormField>
 
+      <FormField>
+        <Localized id="configure-moderation-perspective-toxicityModel">
+          <InputLabel htmlFor="configure-moderation-perspective-model">
+            Toxicity Model
+          </InputLabel>
+        </Localized>
+        <Localized
+          id="configure-moderation-perspective-toxicityModelDescription"
+          externalLink={
+            <ExternalLink
+              href={
+                "https://github.com/conversationai/perspectiveapi/blob/master/api_reference.md#models"
+              }
+            />
+          }
+          $default={TOXICITY_MODEL_DEFAULT}
+        >
+          <InputDescription>
+            Choose your Perspective Model. The default is $default. You can find
+            out more about model choices here.
+          </InputDescription>
+        </Localized>
+        <Field name="integrations.perspective.model">
+          {({ input, meta }) => (
+            <>
+              <TextField
+                id="configure-moderation-perspective-model"
+                name={input.name}
+                onChange={input.onChange}
+                value={input.value}
+                disabled={disabled}
+                autoComplete="off"
+                autoCorrect="off"
+                autoCapitalize="off"
+                placeholder={TOXICITY_MODEL_DEFAULT}
+                spellCheck={false}
+              />
+              {meta.touched && (meta.error || meta.submitError) && (
+                <ValidationMessage>
+                  {meta.error || meta.submitError}
+                </ValidationMessage>
+              )}
+            </>
+          )}
+        </Field>
+      </FormField>
+
       <FormField container={<FieldSet />}>
         <Localized id="configure-moderation-perspective-allowStoreCommentData">
           <InputLabel container="legend">
@@ -135,7 +183,7 @@ const PerspectiveConfig: FunctionComponent<Props> = ({ disabled }) => {
         <Localized id="configure-moderation-perspective-allowStoreCommentDataDescription">
           <InputDescription>
             Stored comments will be used for future research and community model
-            building purposes to improve the API over time
+            building purposes to improve the API over time.
           </InputDescription>
         </Localized>
         <div>
diff --git a/src/core/client/admin/routes/Configure/sections/Moderation/PerspectiveConfigContainer.tsx b/src/core/client/admin/routes/Configure/sections/Moderation/PerspectiveConfigContainer.tsx
index c4b8d7d2b..a26ce1fae 100644
--- a/src/core/client/admin/routes/Configure/sections/Moderation/PerspectiveConfigContainer.tsx
+++ b/src/core/client/admin/routes/Configure/sections/Moderation/PerspectiveConfigContainer.tsx
@@ -32,6 +32,7 @@ const enhanced = withFragmentContainer<Props>({
           enabled
           endpoint
           key
+          model
           threshold
           doNotStore
         }
diff --git a/src/core/client/admin/test/configure/__snapshots__/general.spec.tsx.snap b/src/core/client/admin/test/configure/__snapshots__/general.spec.tsx.snap
index 2610bcec8..e77690e2c 100644
--- a/src/core/client/admin/test/configure/__snapshots__/general.spec.tsx.snap
+++ b/src/core/client/admin/test/configure/__snapshots__/general.spec.tsx.snap
@@ -294,6 +294,7 @@ Markdown can be found
                 <a
                   className="ExternalLink-root"
                   href="#"
+                  rel="noopener noreferrer"
                   target="_blank"
                 >
                   here
diff --git a/src/core/client/admin/test/configure/__snapshots__/moderation.spec.tsx.snap b/src/core/client/admin/test/configure/__snapshots__/moderation.spec.tsx.snap
index c6ec71ae3..75a3bd5ee 100644
--- a/src/core/client/admin/test/configure/__snapshots__/moderation.spec.tsx.snap
+++ b/src/core/client/admin/test/configure/__snapshots__/moderation.spec.tsx.snap
@@ -202,7 +202,7 @@ the
                 className="Box-root Typography-root Typography-detail Typography-colorTextSecondary"
               >
                 This value can be set a percentage between 0 and 100. This number represents the likelihood that a
-comment is toxic, according to Perspective API. By default the treshold is set to 80.
+comment is toxic, according to Perspective API. By default the threshold is set to 80%.
               </p>
               <div
                 className="TextField-root PerspectiveConfig-thresholdTextField"
@@ -232,6 +232,48 @@ comment is toxic, according to Perspective API. By default the treshold is set t
                 </div>
               </div>
             </div>
+            <div
+              className="Box-root HorizontalGutter-root FormField-root HorizontalGutter-half"
+            >
+              <label
+                className="Box-root Typography-root Typography-inputLabel Typography-colorTextPrimary InputLabel-root"
+                htmlFor="configure-moderation-perspective-model"
+              >
+                Toxicity Model
+              </label>
+              <p
+                className="Box-root Typography-root Typography-detail Typography-colorTextSecondary"
+              >
+                Choose your Perspective Model. The default is TOXICITY. You can find out more about model choices 
+                <a
+                  className="ExternalLink-root"
+                  href="https://github.com/conversationai/perspectiveapi/blob/master/api_reference.md#models"
+                  rel="noopener noreferrer"
+                  target="_blank"
+                >
+                  here
+                </a>
+                .
+              </p>
+              <div
+                className="TextField-root"
+              >
+                <input
+                  autoCapitalize="off"
+                  autoComplete="off"
+                  autoCorrect="off"
+                  className="TextField-input TextField-colorRegular"
+                  disabled={false}
+                  id="configure-moderation-perspective-model"
+                  name="integrations.perspective.model"
+                  onChange={[Function]}
+                  placeholder="TOXICITY"
+                  spellCheck={false}
+                  type="text"
+                  value=""
+                />
+              </div>
+            </div>
             <fieldset
               className="FieldSet-root Box-root HorizontalGutter-root FormField-root HorizontalGutter-half"
             >
@@ -244,7 +286,7 @@ comment is toxic, according to Perspective API. By default the treshold is set t
                 className="Box-root Typography-root Typography-detail Typography-colorTextSecondary"
               >
                 Stored comments will be used for future research and community model building purposes to
-improve the API over time
+improve the API over time.
               </p>
               <div>
                 <div>
@@ -309,6 +351,7 @@ improve the API over time
                 <a
                   className="ExternalLink-root"
                   href="https://github.com/conversationai/perspectiveapi/blob/master/quickstart.md"
+                  rel="noopener noreferrer"
                   target="_blank"
                 >
                   https://github.com/conversationai/perspectiveapi/blob/master/quickstart.md
@@ -477,6 +520,7 @@ in your Akismet account:
                 <a
                   className="ExternalLink-root"
                   href="https://akismet.com/account/"
+                  rel="noopener noreferrer"
                   target="_blank"
                 >
                   https://akismet.com/account/
diff --git a/src/core/client/admin/test/configure/__snapshots__/wordList.spec.tsx.snap b/src/core/client/admin/test/configure/__snapshots__/wordList.spec.tsx.snap
index 5fccbaaa0..bbd4b3748 100644
--- a/src/core/client/admin/test/configure/__snapshots__/wordList.spec.tsx.snap
+++ b/src/core/client/admin/test/configure/__snapshots__/wordList.spec.tsx.snap
@@ -141,6 +141,7 @@ and paste a comma separated list?
                 <a
                   className="ExternalLink-root"
                   href="#"
+                  rel="noopener noreferrer"
                   target="_blank"
                 >
                   Learn how to convert your list
@@ -198,6 +199,7 @@ and paste a comma separated list?
                 <a
                   className="ExternalLink-root"
                   href="#"
+                  rel="noopener noreferrer"
                   target="_blank"
                 >
                   Learn how to convert your list
diff --git a/src/core/client/admin/test/configure/moderation.spec.tsx b/src/core/client/admin/test/configure/moderation.spec.tsx
index fe7e1ed92..b0883acb6 100644
--- a/src/core/client/admin/test/configure/moderation.spec.tsx
+++ b/src/core/client/admin/test/configure/moderation.spec.tsx
@@ -150,6 +150,7 @@ it("change perspective settings", async () => {
                 enabled: true,
                 endpoint: "https://custom-endpoint.net",
                 key: "my api key",
+                model: null,
                 threshold: 0.1,
               }
             );
diff --git a/src/core/client/framework/lib/i18n/components/ExternalLink.tsx b/src/core/client/framework/lib/i18n/components/ExternalLink.tsx
index 21217c7ea..8996ed43a 100644
--- a/src/core/client/framework/lib/i18n/components/ExternalLink.tsx
+++ b/src/core/client/framework/lib/i18n/components/ExternalLink.tsx
@@ -6,7 +6,17 @@ const ExternalLink: FunctionComponent<{
   href?: string;
   children?: string;
 }> = ({ href, children }) => (
-  <a href={href || children} target="_blank" className={styles.root}>
+  <a
+    href={href || children}
+    target="_blank"
+    /**
+     * Added as a security workaround as per:
+     *
+     * https://www.jitbit.com/alexblog/256-targetblank---the-most-underestimated-vulnerability-ever/
+     */
+    rel="noopener noreferrer"
+    className={styles.root}
+  >
     {children}
   </a>
 );
diff --git a/src/core/client/framework/lib/i18n/components/__snapshots__/ExternalLink.spec.tsx.snap b/src/core/client/framework/lib/i18n/components/__snapshots__/ExternalLink.spec.tsx.snap
index a1e593820..49419993c 100644
--- a/src/core/client/framework/lib/i18n/components/__snapshots__/ExternalLink.spec.tsx.snap
+++ b/src/core/client/framework/lib/i18n/components/__snapshots__/ExternalLink.spec.tsx.snap
@@ -4,6 +4,7 @@ exports[`renders correctly 1`] = `
 <a
   className="ExternalLink-root"
   href="http://test.com"
+  rel="noopener noreferrer"
   target="_blank"
 >
   http://test.com
diff --git a/src/core/common/constants.ts b/src/core/common/constants.ts
index 31f829e06..4c6a48835 100644
--- a/src/core/common/constants.ts
+++ b/src/core/common/constants.ts
@@ -16,3 +16,14 @@ export const CLIENT_ID_PARAM = "clientID";
  * token in connectionParams when authenticating a websocket connection.
  */
 export const ACCESS_TOKEN_PARAM = "accessToken";
+
+/**
+ * TOXICITY_THRESHOLD_DEFAULT is the default value used when the threshold is
+ * not set.
+ */
+export const TOXICITY_THRESHOLD_DEFAULT = 80;
+
+/**
+ * TOXICITY_MODEL_DEFAULT is the default value used for the toxicity model.
+ */
+export const TOXICITY_MODEL_DEFAULT = "TOXICITY";
diff --git a/src/core/server/graph/tenant/schema/schema.graphql b/src/core/server/graph/tenant/schema/schema.graphql
index 4a347f5eb..087999c94 100644
--- a/src/core/server/graph/tenant/schema/schema.graphql
+++ b/src/core/server/graph/tenant/schema/schema.graphql
@@ -763,6 +763,11 @@ type PerspectiveExternalIntegration {
   """
   threshold: Float
 
+  """
+  model is the Perspective model to use.
+  """
+  model: String
+
   """
   When True, comments sent will not be stored by the Google Perspective API.
   """
@@ -2693,6 +2698,11 @@ input SettingsPerspectiveExternalIntegrationInput {
   """
   key: String
 
+  """
+  model is the name of the Perspective model to use.
+  """
+  model: String
+
   """
   The threshold that given a specific toxic comment score, the comment will
   be marked by Coral as toxic.
diff --git a/src/core/server/services/comments/pipeline/phases/toxic.ts b/src/core/server/services/comments/pipeline/phases/toxic.ts
index c7ef915dd..97088275a 100644
--- a/src/core/server/services/comments/pipeline/phases/toxic.ts
+++ b/src/core/server/services/comments/pipeline/phases/toxic.ts
@@ -2,6 +2,10 @@ import { isNil } from "lodash";
 import ms from "ms";
 import fetch from "node-fetch";
 
+import {
+  TOXICITY_MODEL_DEFAULT,
+  TOXICITY_THRESHOLD_DEFAULT,
+} from "coral-common/constants";
 import { Omit } from "coral-common/types";
 import { ToxicCommentError } from "coral-server/errors";
 import {
@@ -56,8 +60,7 @@ export const toxic: IntermediateModerationPhase = async ({
 
   let threshold = integration.threshold;
   if (isNil(threshold)) {
-    // TODO: (wyattjoh) replace hardcoded default with config.
-    threshold = 0.8;
+    threshold = TOXICITY_THRESHOLD_DEFAULT / 100;
 
     log.trace(
       { threshold },
@@ -81,17 +84,17 @@ export const toxic: IntermediateModerationPhase = async ({
   try {
     logger.trace("checking comment toxicity");
 
-    // TODO: (wyattjoh) support custom toxicity model.
-    const model = "TOXICITY";
+    // Pull the custom model out.
+    const model = integration.model || TOXICITY_MODEL_DEFAULT;
 
     // Call into the Toxic comment API.
     const score = await getScore(
       comment.body,
-      model,
       {
         endpoint,
         key: integration.key,
         doNotStore,
+        model,
       },
       timeout
     );
@@ -142,10 +145,10 @@ export const toxic: IntermediateModerationPhase = async ({
  */
 async function getScore(
   text: string,
-  model: string,
   {
     key,
     endpoint,
+    model,
     doNotStore,
   }: Required<Omit<GQLPerspectiveExternalIntegration, "enabled" | "threshold">>,
   timeout: number
diff --git a/src/locales/en-US/admin.ftl b/src/locales/en-US/admin.ftl
index ae0fd6f75..c0b1b7fd0 100644
--- a/src/locales/en-US/admin.ftl
+++ b/src/locales/en-US/admin.ftl
@@ -245,11 +245,14 @@ configure-moderation-perspective-filter = Toxic Comment Filter
 configure-moderation-perspective-toxicityThreshold = Toxicity Threshold
 configure-moderation-perspective-toxicityThresholdDescription =
   This value can be set a percentage between 0 and 100. This number represents the likelihood that a
-  comment is toxic, according to Perspective API. By default the treshold is set to { $default }.
+  comment is toxic, according to Perspective API. By default the threshold is set to { $default }.
+configure-moderation-perspective-toxicityModel = Toxicity Model
+configure-moderation-perspective-toxicityModelDescription =
+  Choose your Perspective Model. The default is { $default }. You can find out more about model choices <externalLink>here</externalLink>.
 configure-moderation-perspective-allowStoreCommentData = Allow Google to Store Comment Data
 configure-moderation-perspective-allowStoreCommentDataDescription =
   Stored comments will be used for future research and community model building purposes to
-  improve the API over time
+  improve the API over time.
 configure-moderation-perspective-customEndpoint = Custom Endpoint
 configure-moderation-perspective-defaultEndpoint =
   By default the endpoint is set to { $default }. You may override this here.