DeepSeek V4.1 Flash 1017 is a snapshot release (Oct 17, 2026) of a sparse mixture-of-experts model built on DeepSeek’s Causal Encoder-Decoder architecture. It activates 8B parameters on input and 16B on output from a 552B-parameter backbone, using an asymmetric activation split to keep per-token compute low. Visual and text embeddings were trained jointly from pretraining, making image understanding native to the model. It supports a 1,048,576-token context window (with up to 393,216 completion tokens), accepts text and images as input and returns text, and offers tool calling (tools, tool_choice) plus a JSON response_format option without schema enforcement. Published pricing is $0.15 per 1M input tokens, $0.60 per 1M output tokens, and $0.003 per 1M cache-read tokens.
Targeted at coding, terminal/computer-use agents and long-horizon, multi-step workflows, the model emphasizes cost-efficient agentic use: compressed KV caching reduces cache memory to roughly a quarter of the prior Flash generation. DeepSeek positions this tier as a cost-efficient V4.1 offering and claims improvements over V4 Pro in performance, speed, and task completion time. Measured throughput is about 155 tokens/sec with P50 latency ~1.24s and near-100% uptime/99.72% availability over three days. The model is hosted by a single provider via OpenRouter and currently lacks EU in-region routing.
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