DeepSeek: DeepSeek V4.1 Flash API

DeepSeek-V4.1-Flash is a multimodal Mixture-of-Experts model with 552B backbone parameters that natively processes images and text at up to 1M token context. Its Causal Encoder-Decoder architecture activates only 8B parameters during prefill and 16B during decode, cutting the KV cache footprint to roughly a quarter of DeepSeek-V4-Flash for cost-efficient agentic workloads.

• Context window: 1,040,000 tokens
• Max output: 384,000 tokens
• Input: text
• Output: text
• Reasoning: Supported
• Tool calling: Supported
• File input: Supported
• Released: 2026-09-09