DeepSeek V4.1 Flash 1017 Ultrafast
DeepSeek V4.1 Flash 1017 Ultrafast is a reasoning model from DeepSeek released on Nov 6, 2026. It reads text and images and writes text, with a 1.05M token context window and up to 1.05M tokens per reply.
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It costs $2.40 per million input tokens and $9.60 per million output tokens. Cached input bills at $0.048, 98% less than fresh input.
It supports tool calling and prompt caching.
- Modalities
- In / out price
- $2.40 / $9.60 per 1M
- Context
- 1.05M
- Max output
- 1.05M
- Released
- Nov 6, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
DeepSeek V4.1 Flash 1017 Ultrafast pricing
USD, as listed on Nov 7, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $2.40 / 1M tokens | |
|---|---|---|
| Output | $9.60 / 1M tokens | |
| Cached input (read) | $0.048 / 1M tokens | 98% off input |
What DeepSeek V4.1 Flash 1017 Ultrafast costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call DeepSeek V4.1 Flash 1017 Ultrafast through an OpenAI compatible API.
- Tools
tools - Reasoning
reasoning
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DeepSeek V4.1 Flash 1017 Ultrafast questions
How much does the DeepSeek V4.1 Flash 1017 Ultrafast API cost?
$2.40 per million input tokens and $9.60 per million output tokens, with cached input at $0.048. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of DeepSeek V4.1 Flash 1017 Ultrafast?
1,048,576 tokens of input, and it can write up to 1,048,576 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does DeepSeek V4.1 Flash 1017 Ultrafast support tool calling?
Yes. It accepts tool definitions, which is what an agent needs to call your APIs.
Is DeepSeek V4.1 Flash 1017 Ultrafast open source?
No. DeepSeek serves it through an API only, so you cannot download the weights or host it yourself.
When was DeepSeek V4.1 Flash 1017 Ultrafast released?
Nov 6, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Nov 7, 2026. The summary is written from these facts.