DeepSeek V3.1 Terminus

Name: DeepSeek V3.1 Terminus
Price: 0.27 USD
Availability: InStock
Author: DeepSeek

deepseek/deepseek-v3.1-terminus

DeepSeek-V3.1 Terminus is an update to DeepSeek V3.1 that maintains the model's original capabilities while addressing issues reported by users, including language consistency and agent capabilities, further optimizing the model's performance in coding and search agents. It is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes. It extends the DeepSeek-V3 base with a two-phase long-context training process, reaching up to 128K tokens, and uses FP8 microscaling for efficient inference. Users can control the reasoning behaviour with the `reasoning` `enabled` boolean. Learn more in our docs

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Input price: $0.27USD / 1M tokens
Output price: $0.95USD / 1M tokens
Context window: N/A
Max output: 32.8K

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32.8K max output

Input$0.27/MOutput$0.95/MCache read$0.13/M

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Model card

Specifications

Pricing

Input: $0.27 / 1M tokens
Output: $0.95 / 1M tokens
Cache read: $0.13 / 1M tokens

Context & modalities

Max output: 32,768 tokens
Input: Text
Output: Text

Capabilities

Chat: Supported
Vision: Not supported
Reasoning: Supported
Structured output: Supported
Function calling: Supported
Audio input: Not supported

Access

Provider: DeepSeek
Model ID: deepseek/deepseek-v3.1-terminus
Execution: sync
Base URL: https://api.sandbase.ai
API: Chat Completions API
Endpoint: /v1/chat/completions

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OpenAI-compatible endpoint with unified authentication and usage tracking.

Production API

Chat Completions API endpoint

https://api.sandbase.ai/v1/chat/completions

Model ID

deepseek/deepseek-v3.1-terminus

# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/chat/completions" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "deepseek/deepseek-v3.1-terminus",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ],
  "max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"

Choose your model

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Model	Context	Input / 1M	Output / 1M	Released
DeepSeek V3.1 TerminusThis model `DeepSeek`	—	$0.27	$0.95	Sep 22, 2025
DeepSeek V4.1 Flash `DeepSeek`	1M	$0.30	$1.20	Sep 10, 2026
DeepSeek V4 Flash Vision Exp (Experimental) `DeepSeek`	1M	$0.30	$1.20	Aug 21, 2026
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DeepSeek V4 Flash 0731 `DeepSeek`	1M	$0.30	$1.20	Jul 31, 2026
DeepSeek V4 Pro `DeepSeek`	1M	$1.32	$3.96	Apr 24, 2026

Questions

FAQ

How do I call DeepSeek V3.1 Terminus through SandBase?

Create a SandBase API key, then send requests with the model ID "deepseek/deepseek-v3.1-terminus" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

How much does DeepSeek V3.1 Terminus cost?

$0.27 per 1M input tokens and $0.95 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

Which features does DeepSeek V3.1 Terminus support?

DeepSeek V3.1 Terminus supports reasoning, function calling, structured output. See Specifications above for the full list.

Do I need a separate DeepSeek account?

No. One SandBase API key and balance gives you access to DeepSeek V3.1 Terminus and the other models in the catalog; you do not need to sign up with DeepSeek separately.