DeepSeek V4 Flash 0731

DeepSeek · Text Generation

POST /v1/chat/completions

Post-trained 0731 release with major gains across coding, repository work, tool use, and full-stack tasks, plus a 1M context window.

At a glance

Field	Value
Model id	`deepseek-v4-flash-0731`
Model release date	2026-07-31
Input modalities	Text
Output modalities	Text
Context window	1M
Weight precision	-
Max output tokens	393,216
Region	Germany
Features	reasoning, function_calling, structured_output, agentic_coding
Native inference	No
New	No
Structured output	JSON Mode
Supported endpoints	`POST /v1/chat/completions`, `POST /v1/responses`, `POST /v1/messages`, `POST /v1beta/models/deepseek-v4-flash-0731:generateContent`
Alternate model ids	`deepseek/deepseek-v4-flash-0731`, `deepseek-ai/deepseek-v4-flash-0731`

Pricing

Charge	Spec	Rate
Input	per 1M prompt tokens	$0.424
Output	per 1M generated tokens	$1.272
Web Search (Linkup)	per call when invoked	$0.013

Example request

curl https://api.empiriolabs.ai/v1/chat/completions \
  -H 'Authorization: Bearer $EMPIRIOLABS_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"model": "deepseek-v4-flash-0731", "messages": [{"role":"user","content":"Hello"}]}'

Parameters

Parameter	Type	Required	Default	Description
`temperature`	number	no	`0.7`	Sampling temperature. 0 = deterministic, 2 = maximum randomness. · Range: 0 – 2
`top_p`	number	no	`0.9`	Nucleus sampling probability mass. Lower = more focused. · Range: 0 – 1
`max_tokens`	number	no	-	Maximum output tokens. When omitted, the model’s own default applies. · Range: 1 – 393216
`stop`	string	no	-	Up to 4 strings where the model will stop generating further tokens.
`enable_thinking`	boolean	no	true	Enable step-by-step reasoning before answering.
`reasoning_effort`	enum	no	`"medium"`	Reasoning effort level. none disables thinking. low, medium, high, and max set bounded thinking budgets sized to the selected model. · Allowed: `none`, `low`, `medium`, `high`, `max`
`thinking_budget`	number	no	`32768`	Maximum tokens reserved for reasoning when thinking is enabled. · Range: 1 – 393216
`response_format`	enum	no	-	Return the output as a valid JSON object (JSON mode). Describe the fields you want in your prompt.
`web_search_linkup`	boolean	no	false	Optional web search powered by Linkup. When enabled, recent web sources are retrieved using your latest user message as the query and provided to the model as additional context. Adds $0.013 per call when invoked on top of the model’s normal token cost. Disabled by default.
`disable_formatting`	boolean	no	false	Return the answer without the Sources list that web search adds.

Notes

Thinking is enabled by default and can be disabled. Reasoning tokens are billed as output tokens. Optional Linkup web search is billed only when invoked.

Variants

`:variant1`

Field	Value
Model id	`deepseek-v4-flash-0731:variant1`
Model release date	2026-07-31
Region	United States
Context window	1M
Weight precision	-
Max output tokens	393,216
Features	reasoning, function_calling, structured_output, agentic_coding
Native inference	No
Structured output	JSON Schema
Supported endpoints	`POST /v1/chat/completions`, `POST /v1/responses`, `POST /v1/messages`, `POST /v1beta/models/deepseek-v4-flash-0731:variant1:generateContent`

Pricing

Charge	Spec	Rate
Input	per 1M prompt tokens	$0.44
Output	per 1M generated tokens	$1.32
Web Search (Linkup)	per call when invoked	$0.013

Parameters

Parameter	Type	Required	Default	Description
`temperature`	number	no	`0.7`	Sampling temperature. 0 = deterministic, 2 = maximum randomness. · Range: 0 – 2
`top_p`	number	no	`0.9`	Nucleus sampling probability mass. Lower = more focused. · Range: 0 – 1
`max_tokens`	number	no	-	Maximum output tokens. When omitted, the model’s own default applies. · Range: 1 – 393216
`stop`	string	no	-	Up to 4 strings where the model will stop generating further tokens.
`enable_thinking`	boolean	no	true	Enable step-by-step reasoning before answering.
`thinking_budget`	number	no	`32768`	Maximum tokens reserved for reasoning when thinking is enabled. · Range: 1 – 393216
`reasoning_effort`	enum	no	`"medium"`	Reasoning effort level. none disables thinking. low, medium, high, and max set bounded thinking budgets sized to the selected model. · Allowed: `none`, `low`, `medium`, `high`, `max`
`response_format`	enum	no	-	Constrain the output to JSON. Use JSON mode for any valid JSON object, or JSON schema to force output that matches a schema you provide.
`web_search_linkup`	boolean	no	false	Optional web search powered by Linkup. When enabled, recent web sources are retrieved using your latest user message as the query and provided to the model as additional context. Adds $0.013 per call when invoked on top of the model’s normal token cost. Disabled by default.
`disable_formatting`	boolean	no	false	Return the answer without the Sources list that web search adds.

Machine-readable schema: GET https://api.empiriolabs.ai/v1/models/deepseek-v4-flash-0731.