# DeepSeek V4 Flash (`deepseek-v4-flash`) Call deepseek-v4-flash on Lazu for $0.1875 per million input tokens and $0.75 per million output tokens. 1M context, up to 384k output tokens, with Tool calling, Vision, Reasoning and Structured output. DeepSeek V4.1 Flash with native vision, reasoning, tool calling and context caching. Legacy API name served by V4.1 Flash; use deepseek-flash for new integrations. ## Facts - **Context:** 1M - **Max output:** 384k - **Knowledge cutoff:** 2025-05 - **Input:** Text · Image - **Output:** Text - **Endpoints:** /v1/chat/completions · /v1/responses ## Prices (USD per million tokens) | Lane | Input | Output | Cache read | Cache write 5m | 7-day availability | |---|---|---|---|---|---| | DeepSeek official price | $0.15 | $0.60 | — | — | — | | Stable | $0.1875 | $0.75 | $0.00375 | — | 99.70% | Prices checked 2026-10-03 17:20 UTC ## Capabilities Tool calling, Vision, Reasoning, Structured output, Prompt caching Reasoning effort: low, high, max ## Example request (POST /v1/chat/completions) ```bash curl -X POST https://api.lazu.ai/v1/chat/completions \ -H "Authorization: Bearer $LAZU_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "deepseek-v4-flash", "messages": [{ "role": "user", "content": "Hello from Lazu" }] }' ``` Any OpenAI SDK works: set `base_url` to `https://api.lazu.ai/v1`. Docs: https://lazu.ai/docs ## Questions ### What is the difference between the stable and discount lanes? The stable lane runs on each maker's official API, is billed at the list price, has the highest availability and suits every use. The discount lane is a reverse-engineered route: a third-party supplier serves the model through its official client, not the official API. It costs far less, but availability varies, a failed request does not fall back to the stable lane, and the supplier may add its own system prompt. So use it only inside the matching agent tool: Claude models in Claude Code, GPT models in Codex, Gemini models in Antigravity. For your own code, or anywhere the output must be controlled exactly, use the stable lane. Both lanes work with the same key, and each key picks the lane per model. ### Can I call deepseek-v4-flash with the OpenAI SDK? Yes. Point the SDK's base URL at https://api.lazu.ai/v1 and use deepseek-v4-flash as the model name. ### How is it billed? Per token actually used — input, output and cache — deducted from your wallet balance. There is no monthly fee, and every request shows up itemized in your usage log.