Claude Sonnet 4.5 vs DeepSeek V4 Pro, API pricing and model comparison

Compare Claude Sonnet 4.5 vs DeepSeek V4 Pro side by side by input/output token price, context window, benchmark signals, capabilities, and example monthly API cost.

Quick comparison summary

This page compares Claude Sonnet 4.5 vs DeepSeek V4 Pro in one matrix. Current records: Claude Sonnet 4.5 on OpenRouter: $3/$15 per 1M tokens, 1000K context window; DeepSeek V4 Pro on OpenRouter: $0.435/$0.87 per 1M tokens, 1049K context window. Prices are estimates—verify official provider pages before production use.

Claude Sonnet 4.5

anthropic/claude-sonnet-4.5

OpenRouter

Input: $3.00 / 1M
Output: $15.00 / 1M
Context: 1m
Model page: Details

V4 Pro

deepseek/deepseek-v4-pro

OpenRouter

Input: $0.4350 / 1M
Output: $0.8700 / 1M
Context: 1.0m
Model page: Details

Comparison matrixLLM Table

Models to compare2/4

Model 1

Select model344 models

Model 2

1.0M

Select model344 models

Anthropic: Claude Sonnet 4.5

OpenRouter

Input

$3.00 / 1M

Output

$15.00 / 1M

Context

Monthly cost

$750.00

Benchmark

1,455LMArena Text Arena

VisionToolsJSONReasoningLong context

DeepSeek: DeepSeek V4 Pro

OpenRouter

Cheapest (this scenario)

Input

$0.4350 / 1M

Output

$0.8700 / 1M

Context

1.0MLargest context

Monthly cost

$69.60

Benchmark

1,458Top benchmarkLMArena Text Arena

ToolsJSONReasoningLong context

Anthropic: Claude Sonnet 4.5

OpenRouter

DeepSeek: DeepSeek V4 Pro

OpenRouter

Input

$3.00 / 1M

$0.4350 / 1MCheapest (this scenario)

Output

$15.00 / 1M

$0.8700 / 1MCheapest (this scenario)

Context

1.0MLargest context

Benchmark

1,455

LMArena Text Arena

1,458Top benchmark

LMArena Text Arena

Monthly cost

$750.00

$69.60Cheapest (this scenario)

Capabilities

VisionToolsJSONReasoningLong context

ToolsJSONReasoningLong context

FAQ

Model comparison notes

How do Claude Sonnet 4.5 vs DeepSeek V4 Pro 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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