DeepSeek v4.1-Flash on Openrouter

DeepSeek released DeepSeek V4.1 Flash on September 10, 2026, a sparse mixture-of-experts model the company reports exceeds its V4 Pro flagship on performance, speed, and task completion time. The model is priced at $0.15 per million input tokens and $0.60 per million output tokens, with cache reads at $0.003 per million tokens, and carries a 1,048,576-token context window supporting up to 384,000 completion tokens. OpenRouter serves DeepSeek V4.1 Flash through three providers — DeepSeek, NovitaAI, and DeepInfra — with automatic failover and routing modes Balanced, Nitro, and Exacto.

DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the cost-efficient tier of the V4.1 family. DeepSeek reports that it exceeds V4 Pro on performance, speed, and task completion time, so it sits ahead of the previous flagship rather than beneath it. It is suited for coding, reasoning, and agentic workflows, and is particularly strong at long-horizon tasks that must run to completion across many steps. Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced price + speed , Nitro fastest , or Exacto highest tool-calling accuracy . Pricing The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one. Performance Throughput is how fast the model writes tokens per second — higher is better . Latency is total round-trip time lower is better . TTFT is time-to-first-token — how long before you see anything appear lower is better . Uptime Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error. Apps Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for. Activity Token volume and request traffic to this model over time. Quick Start Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below. When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options. Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents. Kilo Code is an open-source AI coding agent that works across VS Code, JetBrains, and CLI to help developers ship code faster with agentic workflows. 1.03Btokens Frequently asked questions What is DeepSeek V4.1 Flash? DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the cost-efficient tier of the V4.1 family. DeepSeek reports that it exceeds V4 Pro on performance, speed, and task completion time, so it sits ahead of the previous flagship rather than beneath it. How much does DeepSeek V4.1 Flash cost? DeepSeek V4.1 Flash costs $0.15/M input tokens and $0.60/M output tokens, with separate rates for Cache Read at $0.003/M tokens. What is the context length of DeepSeek V4.1 Flash? DeepSeek V4.1 Flash has a 1,048,576 token context window. It supports up to 384,000 completion tokens. Does DeepSeek V4.1 Flash support tool calling and structured outputs? Yes. DeepSeek V4.1 Flash accepts tools and tool choice for function calling. It supports response format for JSON output, without JSON-schema enforcement. What inputs and outputs does DeepSeek V4.1 Flash support? DeepSeek V4.1 Flash accepts text and images as input and returns text. Which providers serve DeepSeek V4.1 Flash? DeepSeek V4.1 Flash is served by 3 providers on OpenRouter: DeepSeek, NovitaAI and DeepInfra. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing. When was DeepSeek V4.1 Flash released? DeepSeek V4.1 Flash was released on September 10, 2026.