diff --git a/packages/modelfusion/src/model-function/generate-text/prompt-template/Phi3PromptTemplate.test.ts b/packages/modelfusion/src/model-function/generate-text/prompt-template/Phi3PromptTemplate.test.ts
new file mode 100644
index 000000000..664631ee5
--- /dev/null
+++ b/packages/modelfusion/src/model-function/generate-text/prompt-template/Phi3PromptTemplate.test.ts
@@ -0,0 +1,72 @@
+import { chat, instruction, text } from "./Phi3PromptTemplate";
+
+describe("text prompt", () => {
+  it("should format prompt", () => {
+    const prompt = text().format("prompt");
+
+    expect(prompt).toMatchSnapshot();
+  });
+});
+
+describe("instruction prompt", () => {
+  it("should format prompt with instruction", () => {
+    const prompt = instruction().format({
+      instruction: "instruction",
+    });
+
+    expect(prompt).toMatchSnapshot();
+  });
+
+  it("should format prompt with system and instruction", () => {
+    const prompt = instruction().format({
+      system: "system",
+      instruction: "instruction",
+    });
+
+    expect(prompt).toMatchSnapshot();
+  });
+
+  it("should format prompt with instruction and response prefix", () => {
+    const prompt = instruction().format({
+      instruction: "instruction",
+      responsePrefix: "response prefix",
+    });
+
+    expect(prompt).toMatchSnapshot();
+  });
+});
+
+describe("chat prompt", () => {
+  it("should format prompt with user message", () => {
+    const prompt = chat().format({
+      messages: [{ role: "user", content: "user message" }],
+    });
+
+    expect(prompt).toMatchSnapshot();
+  });
+
+  it("should format prompt with user-assistant-user messages", () => {
+    const prompt = chat().format({
+      messages: [
+        { role: "user", content: "1st user message" },
+        { role: "assistant", content: "assistant message" },
+        { role: "user", content: "2nd user message" },
+      ],
+    });
+
+    expect(prompt).toMatchSnapshot();
+  });
+
+  it("should format prompt with system message and user-assistant-user messages", () => {
+    const prompt = chat().format({
+      system: "you are a chatbot",
+      messages: [
+        { role: "user", content: "1st user message" },
+        { role: "assistant", content: "assistant message" },
+        { role: "user", content: "2nd user message" },
+      ],
+    });
+
+    expect(prompt).toMatchSnapshot();
+  });
+});
diff --git a/packages/modelfusion/src/model-function/generate-text/prompt-template/Phi3PromptTemplate.ts b/packages/modelfusion/src/model-function/generate-text/prompt-template/Phi3PromptTemplate.ts
new file mode 100644
index 000000000..cd8f25f4a
--- /dev/null
+++ b/packages/modelfusion/src/model-function/generate-text/prompt-template/Phi3PromptTemplate.ts
@@ -0,0 +1,116 @@
+import { TextGenerationPromptTemplate } from "../TextGenerationPromptTemplate";
+import { ChatPrompt } from "./ChatPrompt";
+import { validateContentIsString } from "./ContentPart";
+import { InstructionPrompt } from "./InstructionPrompt";
+import { InvalidPromptError } from "./InvalidPromptError";
+
+const END_SEGMENT = "<|end|>";
+
+function segmentStart(role: "system" | "user" | "assistant") {
+  return `<|${role}|>\n`;
+}
+
+function segment(
+  role: "system" | "user" | "assistant",
+  text: string | undefined
+) {
+  return text == null ? "" : `${segmentStart(role)}${text}${END_SEGMENT}\n`;
+}
+
+/**
+ * Formats a text prompt using the Phi3 format.
+ */
+export function text(): TextGenerationPromptTemplate<string, string> {
+  return {
+    stopSequences: [END_SEGMENT],
+    format(prompt) {
+      // prompt and then prefix start of assistant response:
+      return segment("user", prompt) + segmentStart("assistant");
+    },
+  };
+}
+
+/**
+ * Formats an instruction prompt using the Phi3 format.
+ *
+ * Phi3 prompt template:
+ * ```
+ * <|system|>
+ * ${ system prompt }<|end|>
+ * <|user|>
+ * ${ instruction }<|end|>
+ * <|assistant|>
+ * ${response prefix}
+ * ```
+ */
+export function instruction(): TextGenerationPromptTemplate<
+  InstructionPrompt,
+  string
+> {
+  return {
+    stopSequences: [END_SEGMENT],
+    format(prompt) {
+      const instruction = validateContentIsString(prompt.instruction, prompt);
+
+      return (
+        segment("system", prompt.system) +
+        segment("user", instruction) +
+        segmentStart("assistant") +
+        (prompt.responsePrefix ?? "")
+      );
+    },
+  };
+}
+
+/**
+ * Formats a chat prompt using the Phi3 format.
+ *
+ * Phi3 prompt template:
+ * ```
+ * <|system|>
+ * You are a helpful assistant that answers questions about the world.<|end|>
+ * <|user|>
+ * What is the capital of France?<|end|>
+ * <|assistant|>
+ * Paris<|end|>
+ * ```
+ */
+export function chat(): TextGenerationPromptTemplate<ChatPrompt, string> {
+  return {
+    format(prompt) {
+      let text = prompt.system != null ? segment("system", prompt.system) : "";
+
+      for (const { role, content } of prompt.messages) {
+        switch (role) {
+          case "user": {
+            text += segment("user", validateContentIsString(content, prompt));
+            break;
+          }
+          case "assistant": {
+            text += segment(
+              "assistant",
+              validateContentIsString(content, prompt)
+            );
+            break;
+          }
+          case "tool": {
+            throw new InvalidPromptError(
+              "Tool messages are not supported.",
+              prompt
+            );
+          }
+          default: {
+            const _exhaustiveCheck: never = role;
+            throw new Error(`Unsupported role: ${_exhaustiveCheck}`);
+          }
+        }
+      }
+
+      // prefix start of assistant response:
+      text += segmentStart("assistant");
+
+      return text;
+    },
+    stopSequences: [END_SEGMENT],
+  };
+}
diff --git a/packages/modelfusion/src/model-function/generate-text/prompt-template/__snapshots__/Phi3PromptTemplate.test.ts.snap b/packages/modelfusion/src/model-function/generate-text/prompt-template/__snapshots__/Phi3PromptTemplate.test.ts.snap
new file mode 100644
index 000000000..bee05099a
--- /dev/null
+++ b/packages/modelfusion/src/model-function/generate-text/prompt-template/__snapshots__/Phi3PromptTemplate.test.ts.snap
@@ -0,0 +1,62 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`chat prompt > should format prompt with system message and user-assistant-user messages 1`] = `
+"<|system|>
+you are a chatbot<|end|>
+<|user|>
+1st user message<|end|>
+<|assistant|>
+assistant message<|end|>
+<|user|>
+2nd user message<|end|>
+<|assistant|>
+"
+`;
+
+exports[`chat prompt > should format prompt with user message 1`] = `
+"<|user|>
+user message<|end|>
+<|assistant|>
+"
+`;
+
+exports[`chat prompt > should format prompt with user-assistant-user messages 1`] = `
+"<|user|>
+1st user message<|end|>
+<|assistant|>
+assistant message<|end|>
+<|user|>
+2nd user message<|end|>
+<|assistant|>
+"
+`;
+
+exports[`instruction prompt > should format prompt with instruction 1`] = `
+"<|user|>
+instruction<|end|>
+<|assistant|>
+"
+`;
+
+exports[`instruction prompt > should format prompt with instruction and response prefix 1`] = `
+"<|user|>
+instruction<|end|>
+<|assistant|>
+response prefix"
+`;
+
+exports[`instruction prompt > should format prompt with system and instruction 1`] = `
+"<|system|>
+system<|end|>
+<|user|>
+instruction<|end|>
+<|assistant|>
+"
+`;
+
+exports[`text prompt > should format prompt 1`] = `
+"<|user|>
+prompt<|end|>
+<|assistant|>
+"
+`;
diff --git a/packages/modelfusion/src/model-provider/llamacpp/LlamaCppPrompt.ts b/packages/modelfusion/src/model-provider/llamacpp/LlamaCppPrompt.ts
index 05e14c9d1..021d3f66b 100644
--- a/packages/modelfusion/src/model-provider/llamacpp/LlamaCppPrompt.ts
+++ b/packages/modelfusion/src/model-provider/llamacpp/LlamaCppPrompt.ts
@@ -9,6 +9,7 @@ import * as synthiaPrompt from "../../model-function/generate-text/prompt-templa
 import * as textPrompt from "../../model-function/generate-text/prompt-template/TextPromptTemplate";
 import * as vicunaPrompt from "../../model-function/generate-text/prompt-template/VicunaPromptTemplate";
 import * as LlamaCppBakLLaVA1Prompt from "./LlamaCppBakLLaVA1PromptTemplate";
+import * as phi3Prompt from "../../model-function/generate-text/prompt-template/Phi3PromptTemplate";
 import { LlamaCppCompletionPrompt } from "./LlamaCppCompletionModel";
 
 export function asLlamaCppPromptTemplate<SOURCE_PROMPT>(
@@ -79,3 +80,4 @@ export const Alpaca = asLlamaCppTextPromptTemplateProvider(alpacaPrompt);
 export const Synthia = asLlamaCppTextPromptTemplateProvider(synthiaPrompt);
 export const Vicuna = asLlamaCppTextPromptTemplateProvider(vicunaPrompt);
 export const BakLLaVA1 = LlamaCppBakLLaVA1Prompt;
+export const Phi3 = asLlamaCppTextPromptTemplateProvider(phi3Prompt);
diff --git a/packages/modelfusion/src/model-provider/ollama/OllamaCompletionPrompt.ts b/packages/modelfusion/src/model-provider/ollama/OllamaCompletionPrompt.ts
index 738d679ef..1954a29c8 100644
--- a/packages/modelfusion/src/model-provider/ollama/OllamaCompletionPrompt.ts
+++ b/packages/modelfusion/src/model-provider/ollama/OllamaCompletionPrompt.ts
@@ -8,6 +8,7 @@ import { TextGenerationPromptTemplateProvider } from "../../model-function/gener
 import * as synthiaPrompt from "../../model-function/generate-text/prompt-template/SynthiaPromptTemplate";
 import * as textPrompt from "../../model-function/generate-text/prompt-template/TextPromptTemplate";
 import * as vicunaPrompt from "../../model-function/generate-text/prompt-template/VicunaPromptTemplate";
+import * as phi3Prompt from "../../model-function/generate-text/prompt-template/Phi3PromptTemplate";
 import { OllamaCompletionPrompt } from "./OllamaCompletionModel";
 
 export function asOllamaCompletionPromptTemplate<SOURCE_PROMPT>(
@@ -83,3 +84,4 @@ export const Synthia =
   asOllamaCompletionTextPromptTemplateProvider(synthiaPrompt);
 export const Vicuna =
   asOllamaCompletionTextPromptTemplateProvider(vicunaPrompt);
+export const Phi3 = asOllamaCompletionTextPromptTemplateProvider(phi3Prompt);