DeepSeek · DeepSeek Flash line · lightweight · open weights
DeepSeek-V4.1-Flash-1017 was released by DeepSeek on October 17, 2026, as an open-weights lightweight model in the DeepSeek Flash line.
An update to DeepSeek-V4.1-Flash that scores higher on every agentic, coding and reasoning test DeepSeek published while giving shorter answers, with the same MIT weights, 1M-token context and API price.
Compared with DeepSeek-V4.1-Flash · the model it replaces
Completes more multi-step tasks at the command line
Terminal-Bench 4.0 — running real commands to complete a task
42.3
▲ up from 31.2 · +11.1 points
Scores higher than DeepSeek-V4.1-Flash on a combined set of hard tests
Artificial Analysis Intelligence Index v4.3.2 — one score averaging 10 hard tests
45
▲ up from 39 · +6 points · both at max effort
Costs developers the same as the model it replaces
Price per 1M tokens — what developers pay, input / output, at peak hours
$0.30 / $1.20
peak hours · same as DeepSeek-V4.1-Flash · $0.15 / $0.60 off-peak
Every Monday, only when something shipped: the AI models that came out, what each one changed, and which lines are due next.
We email you a link to confirm first · unsubscribe anytime · read past issues · about the newsletter · RSS for the DeepSeek Flash line
DeepSeek-V4.1-Flash-1017 is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: DeepSeek-V4.1-Flash-1017 · Oct 17, 2026
Newest first. See the full line with every card →