Question 1

What is DeepSeek V4.1 Flash?

Accepted Answer

DeepSeek V4.1 Flash is a model from Deepseek, released on Sep 10, 2026. DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture. It activates 8B parameters on input and 16B on...

Question 2

How much does DeepSeek V4.1 Flash cost?

Accepted Answer

On the Respan gateway, input starts at $0.0030 per 1M tokens on Relace, and output starts at $0.44 per 1M tokens on Wafer, after gateway discounts. Averaged across 18 providers, it costs $0.24 per 1M input tokens and $1.03 per 1M output tokens.

Question 3

Which providers serve DeepSeek V4.1 Flash on Respan?

Accepted Answer

18 providers serve DeepSeek V4.1 Flash: Relace, OpenRouter, Wafer, Prism, DeepInfra, Nextbit256, and 10 more. Fireworks, TogetherAI, and Azure DeepSeek require your own provider API key (BYOK).

Question 4

What is DeepSeek V4.1 Flash's context window?

Accepted Answer

DeepSeek V4.1 Flash accepts up to 1.0M tokens of context on its largest provider route.

Question 5

How do I use DeepSeek V4.1 Flash with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "deepseek/deepseek-flash". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is DeepSeek V4.1 Flash?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was Prism at 244 tokens per second, and the lowest response latency was 1.6 seconds on Novita. Speed varies with request size and provider.

Question 7

Where does DeepSeek V4.1 Flash rank on the Respan Index?

Accepted Answer

DeepSeek V4.1 Flash scores 50.9 out of 100 on the Respan Index v1.1, ranking #20 of 138 models. By category: Coding 40.1, Agents 61.2, Reasoning 48.2, Knowledge & language 51.5, and Human preference 55.7. The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

Question 8

How does DeepSeek V4.1 Flash score on benchmarks?

Accepted Answer

DeepSeek V4.1 Flash has 17 published benchmark scores, including Terminal-Bench 2.1 90.6%, LiveBench Agentic Coding 77.3%, and GPQA Diamond 90.9%. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
Relace`relace/deepseek-ai/DeepSeek-V4.1-Flash`	1.0M	$0.0030/M	$1.20/M
OpenRouter`openrouter/deepseek/deepseek-v4.1-flash`	1.0M	$0.02/M	$1.32/M
Wafer`wafer/DeepSeek-V4.1-Flash`	1.0M	$0.10/M	$0.44/M
PrismSave 20%`prism/deepseek-v4.1-flash`	1M	$0.14/M	$0.50/M
DeepInfra`deepinfra/deepseek-ai/DeepSeek-V4.1-Flash`	1.0M	$0.20/M	$0.60/M
Nextbit256`nextbit256/deepseek:v4.1-flash`	1.0M	$0.21/M	$0.84/M
FireworksBYOK only`fireworks_ai/deepseek-v4p1-flash`	1.0M	$0.22/M	$0.66/M
NovitaSave 10%`novita/deepseek/deepseek-v4.1-flash`	1.0M	$0.27/M	$1.08/M
Inference.net`inference_net/deepseek-v4.1-flash`	1.0M	$0.30/M	$1.00/M
Baseten`baseten/deepseek-ai/DeepSeek-V4.1-Flash`	1.0M	$0.30/M	$1.20/M
Deepseek`deepseek/deepseek-flash`	1.0M	$0.30/M	$1.20/M
EmpirioLabs`empiriolabs/deepseek-v4-1-flash`	1M	$0.30/M	$1.20/M
Nebius`nebius/deepseek-ai/DeepSeek-V4.1-Flash`	1.0M	$0.30/M	$1.20/M
Parasail`parasail/deepseek-ai/DeepSeek-V4.1-Flash`	1.0M	$0.30/M	$1.20/M
Parasail`parasail/parasail-deepseek-v41-flash`	1.0M	$0.30/M	$1.20/M
TogetherAIBYOK only`together_ai/deepseek-ai/DeepSeek-V4.1-Flash`	1.0M	$0.30/M	$1.20/M
Nextbit256`nextbit256/deepseek:v4-flash-0731`	1.0M	$0.35/M	$1.06/M
Azure DeepSeekBYOK only`azure_deepseek/deepseek-v4.1-flash`	1M	$0.38/M	$1.50/M

DeepSeek V4.1 Flash

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Time to first token

Response latency

Benchmarks

Respan Indexv1.1

Coding4

Apps