--- description: Gemini 3.5 Flash-Lite is a low-latency, cost-effective multimodal model optimized for high-throughput, low-cost execution for subagent tasks and document parsing. title: Gemini 3.5 Flash-Lite image: https://developers.cloudflare.com/og-docs.png --- [Skip to content](#main-content) > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/llms.txt > Use this file to discover all available pages before exploring further. ![Google logo](https://developers.cloudflare.com/_astro/google.DyXKPTPP.svg) # Gemini 3.5 Flash-Lite Text Generation • Google Copy as Markdown|[View as Markdown](https://developers.cloudflare.com/ai/models/google/gemini-3.5-flash-lite/index.md)|[Agent setup](https://developers.cloudflare.com/agent-setup/) `google/gemini-3.5-flash-lite` * Third-party Gemini 3.5 Flash-Lite is a low-latency, cost-effective multimodal model optimized for high-throughput, low-cost execution for subagent tasks and document parsing. | Model Info | | | ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------ | | Context Window[ ↗](https://developers.cloudflare.com/workers-ai/platform/glossary/) | 1,048,576 tokens | | Terms and License | [link ↗](https://ai.google.dev/gemini-api/terms) | | More information | [link ↗](https://deepmind.google/technologies/gemini/) | | Request formats | Chat Completions | | Pricing | [View pricing in the Cloudflare dashboard ↗](https://dash.cloudflare.com/?to=/:account/ai/models/google/gemini-3.5-flash-lite) | ## Usage ```ts const response = await env.AI.run( 'google/gemini-3.5-flash-lite', { contents: [{ parts: [{ text: 'What are the three laws of thermodynamics?' }], role: 'user' }] }, ) console.log(response) ``` ```bash curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \ --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \ --header "Content-Type: application/json" \ --data '{ "model": "google/gemini-3.5-flash-lite", "input": { "contents": [ { "parts": [ { "text": "What are the three laws of thermodynamics?" } ], "role": "user" } ] } }' ``` The three laws of thermodynamics are fundamental physical principles that describe how energy behaves in the universe—specifically regarding heat, work, entropy, and the limits of energy transfer. Here is a summary of the three laws, along with a "zeroth law" that was established later but is equally fundamental. --- ### The Zeroth Law of Thermodynamics *(Establishes temperature as a measurable property and defines thermal equilibrium.)* * **The Law:** If two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other. * **Plain English:** If System A is the same temperature as System C, and System B is also the same temperature as System C, then System A and System B are the same temperature. * **Why it matters:** This law forms the scientific basis for thermometers. --- ### The First Law of Thermodynamics *(The Law of Conservation of Energy)* * **The Law:** Energy cannot be created or destroyed in an isolated system; it can only be changed from one form to another. * **Plain English:** You can’t get something for nothing. The total amount of energy in the universe remains constant. If a system gains energy, it must come from somewhere else; if it loses energy, it must go somewhere else. * **Example:** When you drive a car, chemical energy stored in the gasoline is converted into thermal energy (heat) and kinetic energy (motion). No energy is lost, just transformed. --- ### The Second Law of Thermodynamics *(The Law of Entropy)* * **The Law:** The total entropy (disorder or randomness) of an isolated system always increases over time. Heat naturally flows from a hotter object to a cooler object, never the reverse spontaneously. * **Plain English:** Things naturally fall apart, cool down, or become disorganized unless you put work into maintaining them. You cannot convert heat energy into work with 100% efficiency; some energy is always "lost" as unusable waste heat. * **Example:** A cup of hot coffee left on a table will eventually cool down to room temperature. The reverse—a room-temperature cup of coffee spontaneously absorbing heat from the room to become boiling hot—never happens naturally. * **Why it matters:** This law explains why perpetual motion machines are impossible and gives our universe a "direction of time" (often called the "arrow of time"). --- ### The Third Law of Thermodynamics *(The Behavior at Absolute Zero)* * **The Law:** As the temperature of a system approaches absolute zero ($0\text{ Kelvin}$ or $-273.15^\circ\text{C}$), the entropy of a pure, perfect crystalline substance approaches a minimum value (typically zero). * **Plain English:** You cannot reach absolute zero. As atoms get colder and colder, they slow down and lose thermal motion, but you can never completely stop molecular motion entirely. * **Why it matters:** It sets a fundamental lower limit on temperature and helps scientists calculate the absolute entropy of substances. ```json { "candidates": [ { "content": { "role": "model", "parts": [ { "text": "The three laws of thermodynamics are fundamental physical principles that describe how energy behaves in the universe—specifically regarding heat, work, entropy, and the limits of energy transfer. \n\nHere is a summary of the three laws, along with a \"zeroth law\" that was established later but is equally fundamental.\n\n---\n\n### The Zeroth Law of Thermodynamics\n*(Establishes temperature as a measurable property and defines thermal equilibrium.)*\n* **The Law:** If two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other.\n* **Plain English:** If System A is the same temperature as System C, and System B is also the same temperature as System C, then System A and System B are the same temperature. \n* **Why it matters:** This law forms the scientific basis for thermometers.\n\n---\n\n### The First Law of Thermodynamics\n*(The Law of Conservation of Energy)*\n* **The Law:** Energy cannot be created or destroyed in an isolated system; it can only be changed from one form to another.\n* **Plain English:** You can’t get something for nothing. The total amount of energy in the universe remains constant. If a system gains energy, it must come from somewhere else; if it loses energy, it must go somewhere else.\n* **Example:** When you drive a car, chemical energy stored in the gasoline is converted into thermal energy (heat) and kinetic energy (motion). No energy is lost, just transformed.\n\n---\n\n### The Second Law of Thermodynamics\n*(The Law of Entropy)*\n* **The Law:** The total entropy (disorder or randomness) of an isolated system always increases over time. Heat naturally flows from a hotter object to a cooler object, never the reverse spontaneously.\n* **Plain English:** Things naturally fall apart, cool down, or become disorganized unless you put work into maintaining them. You cannot convert heat energy into work with 100% efficiency; some energy is always \"lost\" as unusable waste heat.\n* **Example:** A cup of hot coffee left on a table will eventually cool down to room temperature. The reverse—a room-temperature cup of coffee spontaneously absorbing heat from the room to become boiling hot—never happens naturally. \n* **Why it matters:** This law explains why perpetual motion machines are impossible and gives our universe a \"direction of time\" (often called the \"arrow of time\").\n\n---\n\n### The Third Law of Thermodynamics\n*(The Behavior at Absolute Zero)*\n* **The Law:** As the temperature of a system approaches absolute zero ($0\\text{ Kelvin}$ or $-273.15^\\circ\\text{C}$), the entropy of a pure, perfect crystalline substance approaches a minimum value (typically zero).\n* **Plain English:** You cannot reach absolute zero. As atoms get colder and colder, they slow down and lose thermal motion, but you can never completely stop molecular motion entirely.\n* **Why it matters:** It sets a fundamental lower limit on temperature and helps scientists calculate the absolute entropy of substances.", "thoughtSignature": "AY89a1/ol32QPrMVbKQjdSf9juhARUkac2Z+KPcq5oo84TKrgbEj7WuE+4yuNhidBd0=" } ] }, "finishReason": "STOP" } ], "usageMetadata": { "promptTokenCount": 8, "candidatesTokenCount": 634, "totalTokenCount": 642, "trafficType": "ON_DEMAND", "promptTokensDetails": [ { "modality": "TEXT", "tokenCount": 8 } ], "candidatesTokensDetails": [ { "modality": "TEXT", "tokenCount": 634 } ] }, "modelVersion": "gemini-3.5-flash-lite", "createTime": "2026-07-21T16:21:55.338444Z", "responseId": "o5xfaozUFK2o8sYPiYHy-Ag" } ``` ## Examples **Data Extraction** — Structured data extraction from unstructured text, a common subagent task ```ts const response = await env.AI.run( 'google/gemini-3.5-flash-lite', { contents: [ { parts: [ { text: "Extract the name, email, and phone number from this text as JSON: 'Hi, I'm Jordan Blake, reach me at jordan.blake@example.com or 555-2938.'", }, ], role: 'user', }, ], generationConfig: { temperature: 0 }, systemInstruction: { parts: [ { text: 'You are a data extraction assistant. Respond with only valid JSON, no extra commentary.', }, ], }, }, ) console.log(response) ``` ```bash curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \ --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \ --header "Content-Type: application/json" \ --data '{ "model": "google/gemini-3.5-flash-lite", "input": { "contents": [ { "parts": [ { "text": "Extract the name, email, and phone number from this text as JSON: '\''Hi, I'\''m Jordan Blake, reach me at jordan.blake@example.com or 555-2938.'\''" } ], "role": "user" } ], "generationConfig": { "temperature": 0 }, "systemInstruction": { "parts": [ { "text": "You are a data extraction assistant. Respond with only valid JSON, no extra commentary." } ] } } }' ``` { "name": "Jordan Blake", "email": "jordan.blake@example.com", "phone": "555-2938" } ```json { "candidates": [ { "content": { "role": "model", "parts": [ { "text": "{\n \"name\": \"Jordan Blake\",\n \"email\": \"jordan.blake@example.com\",\n \"phone\": \"555-2938\"\n}", "thoughtSignature": "AY89a1+AejOv/9okEuBeoArPDSAKd5ZcT4tlNk6itaskjb7ezx7K9fEu5NLFUx4iUig=" } ] }, "finishReason": "STOP" } ], "usageMetadata": { "promptTokenCount": 63, "candidatesTokenCount": 43, "totalTokenCount": 106, "trafficType": "ON_DEMAND", "promptTokensDetails": [ { "modality": "TEXT", "tokenCount": 63 } ], "candidatesTokensDetails": [ { "modality": "TEXT", "tokenCount": 43 } ] }, "modelVersion": "gemini-3.5-flash-lite", "createTime": "2026-07-21T16:21:57.867550Z", "responseId": "pZxfat75NIvG8sYP3dfakAo" } ``` **Multi-turn Conversation** — Continuing a short conversation with low-latency, high-throughput responses ```ts const response = await env.AI.run( 'google/gemini-3.5-flash-lite', { contents: [ { parts: [ { text: 'Summarize this in one sentence: The meeting covered Q3 budget overruns, a proposed hiring freeze, and a plan to renegotiate vendor contracts.', }, ], role: 'user', }, { parts: [ { text: 'The meeting addressed Q3 budget overruns by proposing a hiring freeze and vendor contract renegotiations.', }, ], role: 'model', }, { parts: [{ text: 'Now make it even shorter, under 10 words.' }], role: 'user' }, ], generationConfig: { maxOutputTokens: 512 }, }, ) console.log(response) ``` ```bash curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/run \ --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \ --header "Content-Type: application/json" \ --data '{ "model": "google/gemini-3.5-flash-lite", "input": { "contents": [ { "parts": [ { "text": "Summarize this in one sentence: The meeting covered Q3 budget overruns, a proposed hiring freeze, and a plan to renegotiate vendor contracts." } ], "role": "user" }, { "parts": [ { "text": "The meeting addressed Q3 budget overruns by proposing a hiring freeze and vendor contract renegotiations." } ], "role": "model" }, { "parts": [ { "text": "Now make it even shorter, under 10 words." } ], "role": "user" } ], "generationConfig": { "maxOutputTokens": 512 } } }' ``` Addressing Q3 budget overruns, hiring freezes, and vendor contracts. ```json { "candidates": [ { "content": { "role": "model", "parts": [ { "text": "Addressing Q3 budget overruns, hiring freezes, and vendor contracts.", "thoughtSignature": "AY89a1/dUv1ajorDdpZkOzaeL0fb5CjoZL4SoKtpQeX8AK5jF5vNa/v4F6r7OqdabWs=" } ] }, "finishReason": "STOP" } ], "usageMetadata": { "promptTokenCount": 61, "candidatesTokenCount": 14, "totalTokenCount": 75, "trafficType": "ON_DEMAND", "promptTokensDetails": [ { "modality": "TEXT", "tokenCount": 61 } ], "candidatesTokensDetails": [ { "modality": "TEXT", "tokenCount": 14 } ] }, "modelVersion": "gemini-3.5-flash-lite", "createTime": "2026-07-21T16:21:58.695703Z", "responseId": "ppxfape7KqSn8sYPpMq_gQ8" } ``` ## Parameters Schema variant Generate ContentChat Completions ▶contents\[\] `array`required ▶systemInstruction{} `object` ▶generationConfig{} `object` ▶safetySettings\[\] `array` ▶tools\[\] `array` toolConfig `` ▶messages\[\] `array`required temperature `number`minimum: 0maximum: 2 max\_tokens `number`exclusiveMinimum: 0 max\_completion\_tokens `number`exclusiveMinimum: 0 top\_p `number`minimum: 0maximum: 1 frequency\_penalty `number`minimum: \-2maximum: 2 presence\_penalty `number`minimum: \-2maximum: 2 stream `boolean` ▶stream\_options{} `object` ▶tools\[\] `array` tool\_choice `` response\_format `` ▶modalities\[\] `array` ▶audio{} `object` ▶candidates\[\] `array` ▶usageMetadata{} `object` modelVersion `string` id `string` object `string` created `number` model `string` ▶choices\[\] `array` ▶usage{} `object` ## API Schemas (Raw) Input Output Was this helpful? YesNo ## On this page [![](https://developers.cloudflare.com/_astro/logo.DMYpXs3t.svg)Docs](https://developers.cloudflare.com/) ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/ai/models/google/gemini-3.5-flash-lite/#page","headline":"Gemini 3.5 Flash-Lite (Google) · Cloudflare AI docs · Cloudflare AI docs","description":"Gemini 3.5 Flash-Lite is a low-latency, cost-effective multimodal model optimized for high-throughput, low-cost execution for subagent tasks and document parsing.","url":"https://developers.cloudflare.com/ai/models/google/gemini-3.5-flash-lite/","inLanguage":"en","image":"https://developers.cloudflare.com/og-docs.png","publisher":{"@type":"Organization","name":"Cloudflare","url":"https://www.cloudflare.com/"},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}} ```