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DeepSeek V4.1 Flash

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deepseek-v4.1-flash
Model Type V4.10731

DeepSeek V4.1 Flash is DeepSeek's current Flash model (deepseek-flash on the official API). Thinking is on by default and comes back in reasoning_content; send thinking={"type":"disabled"} to switch it off and get a direct answer. Tool calling and streaming are supported. Fully OpenAI-compatible: set model to deepseek-v4.1-flash. One flat price around the clock with no peak-hour rate; pay-as-you-go, failed calls never billed.

ChatThinking modeTool callingLow costOpenAI compatible
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Try out DeepSeek V4.1 Flash right here (available after login).

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About DeepSeek V4.1 Flash

DeepSeek V4.1 Flash is DeepSeek's current Flash model (deepseek-flash on the official API), served on NezhaGate through the OpenAI-compatible API. It thinks before it answers by default: the reasoning comes back in message.reasoning_content and the answer always stays in content. Send thinking={"type":"disabled"} to switch thinking off for faster, cheaper answers on simple tasks. Tool calling (function calling) and streaming are supported. Set model to deepseek-v4.1-flash; one flat price around the clock with no peak-hour rate, pay-as-you-go, and failed calls are never billed.

Use cases

Everyday chat and Q&A

Support desks, knowledge Q&A and writing assistants: a low unit price and quick replies make it a fit for high-volume traffic.

Coding and reasoning

With thinking on, the model works the problem through first, which suits code generation, maths and multi-step logic.

Agents and tool calling

OpenAI-format tools / tool_calls plug straight into agent frameworks for retrieval, function calls and multi-step tasks.

Bulk text processing

Classification, extraction, summarising and rewriting can run with thinking off for direct, cheaper output.

How to choose

Pick V4.1 for DeepSeek's latest Flash model; pick the 0731 snapshot when your prompts are tuned for V4 Flash and you want the version pinned. For harder coding and agent work, compare GLM-5.3 - switching is just the model field.

FAQ

How is it different from DeepSeek V4 Flash 0731?
V4.1 is DeepSeek's current Flash release; 0731 is a pinned V4 Flash snapshot whose behaviour does not change with upstream updates. Both cost the same on NezhaGate and are called the same way.
How do I turn thinking off?
Add "thinking": {"type": "disabled"} to the request. The model skips the reasoning step and answers directly, reasoning_content stays empty and you use fewer output tokens. Thinking is on when the field is omitted.
What happens with a very small max_tokens?
This is a thinking model, so reasoning tokens count as output. Upstream treats a max_tokens below 1024 as 1024, so the output (reasoning included) can exceed the value you set, and you are billed for the actual tokens in usage. For short answers, turn thinking off.
Does it support tool calling and streaming?
Yes to both. tools / tool_calls use the OpenAI format; with stream=true the reply arrives as SSE chunks and the reasoning streams in delta.reasoning_content.
Am I charged for failed calls?
No. Only calls that return normally are settled, at actual usage; upstream errors and timeouts never touch your balance.

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