What is the context window of DeepSeek: DeepSeek V3.1 Terminus?

DeepSeek: DeepSeek V3.1 Terminus supports a context window of 163K tokens.

Is DeepSeek: DeepSeek V3.1 Terminus free to use?

DeepSeek: DeepSeek V3.1 Terminus is a paid model. It costs $0.270 per million input tokens and $1.00 per million output tokens.

How is LLM API pricing calculated?

LLM pricing has two components: input tokens (everything you send) and output tokens (what the model generates). Total cost = (prompt tokens × input rate + output tokens × output rate) / 1,000,000 × number of requests.

DeepSeek: DeepSeek V3.1 Terminus API Pricing — $0.270 Input / $1.00 Output per 1M Tokens

Q: How much does DeepSeek: DeepSeek V3.1 Terminus cost?

DeepSeek: DeepSeek V3.1 Terminus costs $0.270 per million input tokens and $1.00 per million output tokens via OpenRouter. Pricing was last updated Oct 29, 2026.

DeepSeek: DeepSeek V3.1 Terminus by DeepSeek — $0.270 input / $1.00 output per 1M tokens via OpenRouter. Context: 163K tokens. Pricing last updated Oct 29, 2026.

Input / 1M tokens

$0.270

Output / 1M tokens

$1.00

Provider

DeepSeek

Context window

163K tokens

Via

OpenRouter

Cost at common usage volumes

Usage	Daily	Monthly
Chatbot (100/day)	$0.139	$4.16
Small app (1K/day)	$0.770	$23.10
Mid-scale (10K/day)	$10.40	$312.00
Large scale (100K/day)	$235.00	$7050.00

Model ID: deepseek/deepseek-v3.1-terminus
Data source: OpenRouter public API — updated Oct 29, 2026.

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About DeepSeek: DeepSeek V3.1 Terminus

DeepSeek: DeepSeek V3.1 Terminus is an LLM developed by DeepSeek. Input costs $0.270 per million tokens and output costs $1.00 per million tokens via OpenRouter. It supports a context window of 163K tokens.

Pricing Details

Via the OpenRouter API:

Input tokens: $0.270 per 1 million tokens
Output tokens: $1.00 per 1 million tokens

A token is roughly 0.75 words. For context: a typical user message of 100 words is approximately 133 tokens; a 500-word system prompt is about 650 tokens.

How Much Does DeepSeek: DeepSeek V3.1 Terminus Cost?

For a typical chatbot application (1,000 requests/day, 1,000 prompt tokens and 500 output tokens per request):

Daily cost: $0.7700
Monthly cost: $23.100

Accessing DeepSeek: DeepSeek V3.1 Terminus via OpenRouter

OpenRouter provides a unified API for 200+ LLMs including DeepSeek: DeepSeek V3.1 Terminus. You can use it with any OpenAI-compatible SDK by setting the base URL to https://openrouter.ai/api/v1 and using your OpenRouter API key. The model ID is deepseek/deepseek-v3.1-terminus.

Compare DeepSeek: DeepSeek V3.1 Terminus with Other Models

Use the AI Model Cost Comparison tool to compare DeepSeek: DeepSeek V3.1 Terminus against GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, or any other model side by side. Or use the LLM API Cost Calculator to browse all 456+ models sorted by cost for your specific usage.

Frequently Asked Questions

Yes. DeepSeek: DeepSeek V3.1 Terminus is available on OpenRouter with the model ID deepseek/deepseek-v3.1-terminus. OpenRouter provides a unified API compatible with OpenAI's SDK format.