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DeepSeek: DeepSeek V3.1 Terminus (Thinking)

deepseek-v3.1-terminus:thinking

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DeepSeek V3.1 Terminus (Thinking) costs $0.325 per million input tokens and $0.910 per million output tokens, supports 128K context, and is available through the OpenAI-compatible API.

Thinking-enabled DeepSeek-V3.1-Terminus with improved language consistency, upgraded Code/Search Agents, and stronger stability and reliability versus V3.1. FP8.

Modalities

Text → Text

Input / output price

$0.325 / $0.910 per 1M

Context

128K · max output 66K

Capabilities

ReasoningTool callingOpen weights

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$0.325
Output$0.910
Cached input$0.163

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.00170
Per day
$0.8515
Per month (30 days)
$25.55

DeepSeek V3.1 Terminus (Thinking): input $0.325/M · output $0.91/M · cached input $0.1625/M

Request with these settings
curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "deepseek-v3.1-terminus:thinking", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to deepseek-v3.1-terminus:thinking.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek-v3.1-terminus:thinking",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is DeepSeek V3.1 Terminus (Thinking) billed?
Input is $0.325 and output is $0.910 per million tokens; cached input is $0.163. The charge for every request is listed in Usage Logs in the console.
How long is the context window?
128K tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?
Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.
DeepSeek V3.1 Terminus (Thinking) API pricing · GeniusRelay