DeepSeek V3.1 Terminus vs GPT-5.4 Nano, API pricing and model comparison

Compare DeepSeek V3.1 Terminus vs GPT-5.4 Nano side by side by input/output token price, context window, benchmark signals, capabilities, and example monthly API cost.

Quick comparison summary

This page compares DeepSeek V3.1 Terminus vs GPT-5.4 Nano in one matrix. Current records: DeepSeek V3.1 Terminus on OpenRouter: $0.27/$0.95 per 1M tokens, 164K context window; GPT-5.4 Nano on OpenRouter: $0.2/$1.25 per 1M tokens, 400K context window. Prices are estimates—verify official provider pages before production use.

V3.1 Terminus

deepseek/deepseek-v3.1-terminus

OpenRouter

Input: $0.2700 / 1M
Output: $0.9500 / 1M
Context: 163.8k
Model page: Details

GPT-5.4 Nano

openai/gpt-5.4-nano

OpenRouter

Input: $0.2000 / 1M
Output: $1.25 / 1M
Context: 400k
Model page: Details

Comparison matrixLLM Table

Models to compare2/4

Model 1

163.8K

Select model344 models

Model 2

400K

Select model344 models

DeepSeek: DeepSeek V3.1 Terminus

OpenRouter

Cheapest (this scenario)

Input

$0.2700 / 1M

Output

$0.9500 / 1M

Context

163.8K

Monthly cost

$55.50

Benchmark

1,418Top benchmarkLMArena Text Arena

ToolsJSONReasoningLong context

OpenAI: GPT-5.4 Nano

OpenRouter

Input

$0.2000 / 1M

Output

$1.25 / 1M

Context

400KLargest context

Monthly cost

$57.50

Benchmark

1,200LMArena Vision Arena

VisionToolsJSONReasoningLong context

DeepSeek: DeepSeek V3.1 Terminus

OpenRouter

OpenAI: GPT-5.4 Nano

OpenRouter

Input

$0.2700 / 1M

$0.2000 / 1MCheapest (this scenario)

Output

$0.9500 / 1MCheapest (this scenario)

$1.25 / 1M

Context

163.8K

400KLargest context

Benchmark

1,418Top benchmark

LMArena Text Arena

1,200

LMArena Vision Arena

Monthly cost

$55.50Cheapest (this scenario)

$57.50

Capabilities

ToolsJSONReasoningLong context

VisionToolsJSONReasoningLong context

FAQ

Model comparison notes

How do DeepSeek V3.1 Terminus vs GPT-5.4 Nano API prices compare?

Compare input and output prices per 1M tokens side by side. The same underlying model can list different prices by route (Direct API vs OpenRouter); this table uses the selected route records.

Which model looks cheaper?

Scenario cost depends on your input/output mix. The example monthly cost in the table uses default token volumes—adjust with the cost calculator for your traffic.

Are benchmark scores included?

Independent or provider-reported benchmark signals appear when available. Benchmarks do not replace price analysis—evaluate both for your quality requirements.

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