> ## Documentation Index > Fetch the complete documentation index at: https://apidoc.deerapi.com/llms.txt > Use this file to discover all available pages before exploring further. # Veo 3 Chat > Use DeerAPI to call the Veo 3 Chat endpoint with request details, response details, examples, and an OpenAPI playground. ## Overview Use this endpoint to call the Veo 3 Chat workflow through DeerAPI. The API reference on this page shows the request schema, response schema, authentication requirements, and runnable examples for the configured endpoint. ## Before you start Use the DeerAPI base URL and pass your API Key in the `Authorization` header: ```text theme={null} https://api.deerapi.com ``` ```text theme={null} Authorization: Bearer $DEERAPI_KEY ``` ## Model selection Choose a current model ID from the [live pricing page](https://api.deerapi.com/pricing). Model availability changes over time, so avoid copying a model ID from an old project without checking the live list first. ## Implementation notes * Use the OpenAPI playground for the exact request fields accepted by this endpoint. * Keep API Keys on the server side when you build production applications. * Log the request ID from failed calls so support can investigate the request. * Retry `429`, `500`, and `503` responses with exponential backoff. ## OpenAPI ````yaml /api/openapi/video/veo3/post-veo3-chat.openapi.json POST /v1/chat/completions openapi: 3.1.0 info: title: Veo 3 Chat API version: 1.0.0 servers: - url: https://api.deerapi.com security: - bearerAuth: [] paths: /v1/chat/completions: post: summary: Veo 3 Chat API operationId: post_v1_chat_completions requestBody: required: true content: application/json: schema: type: object required: - model - messages properties: model: type: string description: Use this field according to the endpoint schema. default: gpt-5.2 messages: type: array description: Use this field according to the endpoint schema. items: type: object properties: role: type: string content: type: string default: - role: system content: You are a helpful assistant. - role: user content: Hello! stream: type: boolean description: Use this field according to the endpoint schema. temperature: type: integer description: Use this field according to the endpoint schema. top_p: type: integer description: Use this field according to the endpoint schema. 'n': type: integer description: Use this field according to the endpoint schema. stop: type: string description: Use this field according to the endpoint schema. max_tokens: type: integer description: Use this field according to the endpoint schema. presence_penalty: type: number description: Use this field according to the endpoint schema. frequency_penalty: type: number description: Use this field according to the endpoint schema. logit_bias: type: 'null' description: Use this field according to the endpoint schema. user: type: string description: Use this field according to the endpoint schema. default: model: gpt-5.2 messages: - role: system content: You are a helpful assistant. - role: user content: Hello! examples: URL_Image_To_Video: summary: Veo 3 Chat API value: model: veo3-fast-frames messages: - role: user content: - type: text text: >- Generate a cute kitten sitting on a cloud, in a manga style. - type: image_url image_url: url: >- https://filesystem.site/cdn/20250414/chxiLc2O45zoLT8BCrQ6WQlTvGDDnK.png max_tokens: 300 example: model: veo3-fast-frames messages: - role: user content: - type: text text: >- Generate a cute kitten sitting on a cloud, in a manga style. - type: image_url image_url: url: >- https://filesystem.site/cdn/20250414/chxiLc2O45zoLT8BCrQ6WQlTvGDDnK.png max_tokens: 300 responses: '200': description: Successful Response content: application/json: schema: type: object required: - id - object - created - model - system_fingerprint - choices - usage properties: id: type: string description: Use this field according to the endpoint schema. object: type: string description: Use this field according to the endpoint schema. created: type: integer description: Use this field according to the endpoint schema. model: type: string description: Use this field according to the endpoint schema. system_fingerprint: type: string description: Use this field according to the endpoint schema. choices: type: array description: Use this field according to the endpoint schema. items: type: object properties: index: type: integer description: Use this field according to the endpoint schema. message: type: object description: Use this field according to the endpoint schema. required: - content - role properties: content: type: string description: Use this field according to the endpoint schema. role: type: string description: Use this field according to the endpoint schema. finish_reason: type: string description: Use this field according to the endpoint schema. usage: type: object description: Use this field according to the endpoint schema. required: - completion_tokens - completion_tokens_details - prompt_tokens - prompt_tokens_details - total_tokens properties: completion_tokens: type: integer description: Use this field according to the endpoint schema. completion_tokens_details: type: object description: Use this field according to the endpoint schema. properties: {} prompt_tokens: type: integer description: Use this field according to the endpoint schema. prompt_tokens_details: type: object description: Use this field according to the endpoint schema. properties: {} total_tokens: type: integer description: Use this field according to the endpoint schema. x-codeSamples: - lang: Shell label: cURL source: | curl https://api.deerapi.com/v1/chat/completions \ -H "Content-Type: application/json" \ -H "Authorization: Bearer $DEERAPI_KEY" \ -d '{ "model": "veo3-fast-frames", "messages": [ { "role": "user", "content": [ { "type": "text", "text": "Generate a cute kitten sitting on a cloud, in a manga style." }, { "type": "image_url", "image_url": { "url": "https://filesystem.site/cdn/20250414/chxiLc2O45zoLT8BCrQ6WQlTvGDDnK.png" } } ] } ], "max_tokens": 300 }' - lang: Python label: requests source: | import os import requests url = "https://api.deerapi.com/v1/chat/completions" headers = { "Authorization": "Bearer " + os.environ["DEERAPI_KEY"], "Content-Type": "application/json", } payload = { "model": "veo3-fast-frames", "messages": [ { "role": "user", "content": [ { "type": "text", "text": "Generate a cute kitten sitting on a cloud, in a manga style." }, { "type": "image_url", "image_url": { "url": "https://filesystem.site/cdn/20250414/chxiLc2O45zoLT8BCrQ6WQlTvGDDnK.png" } } ] } ], "max_tokens": 300 } response = requests.post(url, headers=headers, json=payload) print(response.json()) - lang: JavaScript label: fetch source: > const response = await fetch("https://api.deerapi.com/v1/chat/completions", { method: "POST", headers: { Authorization: `Bearer ${process.env.DEERAPI_KEY}`, "Content-Type": "application/json", }, body: JSON.stringify({ "model": "veo3-fast-frames", "messages": [ { "role": "user", "content": [ { "type": "text", "text": "Generate a cute kitten sitting on a cloud, in a manga style." }, { "type": "image_url", "image_url": { "url": "https://filesystem.site/cdn/20250414/chxiLc2O45zoLT8BCrQ6WQlTvGDDnK.png" } } ] } ], "max_tokens": 300 }), }); console.log(await response.json()); components: securitySchemes: bearerAuth: type: http scheme: bearer description: Use a DeerAPI API Key as a Bearer token. ````