GPT-5.4 Nano vs Grok 4.20, API pricing and model comparison

Compare GPT-5.4 Nano vs Grok 4.20 side by side by input/output token price, context window, benchmark signals, capabilities, and example monthly API cost.

Quick comparison summary

This page compares GPT-5.4 Nano vs Grok 4.20 in one matrix. Current records: GPT-5.4 Nano on OpenRouter: $0.2/$1.25 per 1M tokens, 400K context window; Grok 4.20 on OpenRouter: $1.25/$2.5 per 1M tokens, 2000K context window. Prices are estimates—verify official provider pages before production use.

GPT-5.4 Nano

openai/gpt-5.4-nano

OpenRouter

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

Grok 4.20

x-ai/grok-4.20

OpenRouter

Input: $1.25 / 1M
Output: $2.50 / 1M
Context: 2m
Model page: Details

Comparison matrixLLM Table

Models to compare2/4

Model 1

400K

Select model344 models

Model 2

Select model344 models

OpenAI: GPT-5.4 Nano

OpenRouter

Cheapest (this scenario)

Input

$0.2000 / 1M

Output

$1.25 / 1M

Context

400K

Monthly cost

$57.50

Benchmark

1,200LMArena Vision Arena

VisionToolsJSONReasoningLong context

xAI: Grok 4.20

OpenRouter

Input

$1.25 / 1M

Output

$2.50 / 1M

Context

2MLargest context

Monthly cost

$200.00

Benchmark

1,476Top benchmarkLMArena Text Arena

VisionToolsJSONReasoningLong context

OpenAI: GPT-5.4 Nano

OpenRouter

xAI: Grok 4.20

OpenRouter

Input

$0.2000 / 1MCheapest (this scenario)

$1.25 / 1M

Output

$1.25 / 1MCheapest (this scenario)

$2.50 / 1M

Context

400K

2MLargest context

Benchmark

1,200

LMArena Vision Arena

1,476Top benchmark

LMArena Text Arena

Monthly cost

$57.50Cheapest (this scenario)

$200.00

Capabilities

VisionToolsJSONReasoningLong context

FAQ

Model comparison notes

How do GPT-5.4 Nano vs Grok 4.20 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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