Veo 3.1 Fast Preview

Google

google/veo-3.1-fast-generate-previewClosed API

Video model for prompt-guided generation, editing, and motion workflows

Benchmark Pricing$0.00 / 1M in$0.00 / 1M out

Context: 1,024 tokens•Max Output: 4,096 tokens•Released: 2025-10-15

TECHNICAL SPECIFICATIONS

Context Window1,0241K tokens

Max Output4,0964.1K tokens

LicenseProprietaryCloud API only

Input Modalities

TextVisionVideo

Function / Tool CallingNot Supported

Structured OutputsPrompt Based

MODEL CONTEXT PROTOCOL (MCP) READINESS

⚠ Veo 3.1 Fast Preview does not natively advertise tool-calling capabilities. When connecting to MCP servers, function calling must be handled via structured prompt injection.

MCP Context Window Recommendations

With a context capacity of 1,024 tokens, this model can handle compact tool sets. Consider keeping MCP server tool manifests minimal to preserve headroom.

API CALL INVOCATION EXAMPLE

// Example: Calling Veo 3.1 Fast Preview via OpenAI SDK
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.GOOGLE_API_KEY,
});

const response = await client.chat.completions.create({
  model: "google/veo-3.1-fast-generate-preview",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

console.log(response.choices[0].message.content);