DeepSeek V4 Pro/Flash on Vercel AI Gateway for Agents

DeepSeek V4 Capabilities for Coding and Reasoning

DeepSeek V4 offers two variants with a default 1M token context window. V4 Pro targets agentic coding, formal math reasoning, and long-horizon workflows—it handles full feature development, bug fixes, refactoring across tech stacks, and tool use in frameworks like MCP or agent harnesses. It also generates clear, structured long-form documents. V4 Flash delivers near-Pro reasoning performance on simpler agent tasks but with fewer parameters for faster inference and lower API costs, suiting high-volume or latency-sensitive apps.

This setup lets you delegate complex tasks like repository audits with refactor proposals and PRs, as in this AI SDK example:

import { streamText } from 'ai';

const result = streamText({
  model: 'deepseek/deepseek-v4-pro', // or 'deepseek/deepseek-v4-flash'
  prompt: `Audit this repository for unsafe concurrent access patterns,
    propose a refactor that introduces proper synchronization,
    and open the changes as a PR with a migration plan.`,
});

Specify deepseek/deepseek-v4-pro or deepseek/deepseek-v4-flash in the AI SDK to start streaming responses.

Vercel AI Gateway for Reliable Model Access

AI Gateway unifies model calls across providers, tracks usage/costs, and adds retries, failover, and optimizations for better uptime than single providers. It supports custom reporting, observability, Bring Your Own Key, and intelligent routing. Check the model leaderboard or playground to benchmark DeepSeek V4 against others before integrating.