A visual-reasoning model that keeps going back to the image — pinch to zoom, mid-reasoning.
★★★★☆4.3
D
DeepSeek V4.1-Flash-1017
MIT-licensed open-weights AI model built for fast, affordable coding and agent work.
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What is DeepSeek V4.1-Flash-1017?
Released on October 17, 2026, DeepSeek-V4.1-Flash-1017 is the latest snapshot of DeepSeek's Flash model line — and the open-weights story is the headline. The weights are published on HuggingFace under the MIT license, so anyone can download, modify, or self-host a frontier-class agent model for free, while DeepSeek's own API serves the same checkpoint at a fraction of the cost of closed rivals.
On paper, the 1017 update improves across reasoning, coding, agentic tasks, and visual benchmarks — including a DeepSWE v1.1 score of 77.0 that, in DeepSeek's own table, tops Claude Opus 5 on that software-engineering test. The 1M-token context and ultra-compressed KV cache (about 890 bytes per token) are built for long agent loops: reading big codebases costs far less memory than typical dense models. Note that all benchmark figures are DeepSeek's own and have not been independently reproduced.
Key Features
- MIT-licensed open weights — download and self-host commercially for free
- 1M-token context window for long agent and codebase sessions
- DeepSWE v1.1 77.0 and Terminal-Bench 4.0 42.3 in DeepSeek's own benchmarks
- Compressed KV cache: ~890 bytes per token for cheap long-context serving
- Hosted API at $0.15 per million input tokens
Pros
- Frontier-class agent model with genuinely free, commercially usable open weights
- Among the cheapest ways to run long agentic loops at 1M context
- Multimodal input (text and images) with adjustable reasoning effort
Cons
- Benchmark claims are vendor-reported and have not been independently reproduced
- Full weights are ~510 GB, making self-hosting impractical for most individuals
- A recent five-hour API outage and slowdowns raise reliability questions for hosted use
Pricing
- Model: Freemium
- Weights free to download and run under the MIT license; hosted API from $0.15 per million input tokens — check the official site for current pricing.
Adding Up Your AI Bill?
If you pay for DeepSeek V4.1-Flash-1017 alongside other AI subscriptions, the monthly total adds up quietly. Tick every tool you pay for in our free AI Tool Cost Calculator to see your real monthly and yearly bill — and spot overlaps you can cut. Still choosing? Start with our guide on how to choose the right AI tool.
How We Rated It
Scores reflect our editors’ independent assessment at the time of review.
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