What is DeepSeek-V4.1-Flash?

A large language model is a machine learning model trained on a vast amount of text so that it can generate, summarize, translate and analyze language, and many now also take images as input. One way such models are built is a mixture of experts, where only a few specialist sub-networks handle each piece of input instead of all of them. DeepSeek-V4.1-Flash is a model of this kind from DeepSeek: its model card calls it a multimodal Mixture-of-Experts model with 552 billion backbone parameters (the adjustable numbers inside the model) and support for contexts of up to one million tokens (how much text it can consider at once), designed to read images and text and write text. DeepSeek's documentation says its API uses a format compatible with OpenAI/Anthropic, so tools built for those APIs may be able to call it.

Written from primary sources and reference pages, and checked against them by an independent AI fact-checker. Drafted with AI assistance.