DeepSeek Flash 4.1 is already being tested via API and rolling out.

Translation: "Internal beta testing for an intermediate version of DeepSeek V4.1 Flash is now open; you are welcome to try it out. It adopts a new model architecture featuring native multimodal support, stronger capabilities, faster speeds, and lower costs.
Keep your base_url unchanged and set the model name to deepseek-v4.1-flash-expires-on-0910 to call the API. Current pricing is identical to deepseek-v4-flash, with a rate limit of 20 concurrent requests per account."

From Chubby on 𝕏: https://x.com/kimmonismus/status/2097286327909675477