GPT-5.5 vs Grok 4.3, API pricing and model comparison

Compare GPT-5.5 vs Grok 4.3 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-5.5 vs Grok 4.3 in one matrix. Current records: GPT-5.5 on OpenAI API: $5/$30 per 1M tokens, 1050K context window; Grok 4.3 on OpenRouter: $1.25/$2.5 per 1M tokens, 1000K context window. Prices are estimates—verify official provider pages before production use.

GPT-5.5

gpt-5.5

OpenAI API

Input: $5.00 / 1M
Output: $30.00 / 1M
Context: 1.1m
Model page: Details

Grok 4.3

x-ai/grok-4.3

OpenRouter

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

Comparison matrixLLM Table

Models to compare2/4

Model 1

1.1M

Select model344 models

Model 2

Select model344 models

OpenAI: GPT-5.5

OpenAI API

Input

$5.00 / 1M

Output

$30.00 / 1M

Context

1.1MLargest context

Monthly cost

$1,400.00

Benchmark

58.6%SWE-Bench Pro

VisionToolsJSONReasoningLong context

xAI: Grok 4.3

OpenRouter

Cheapest (this scenario)

Input

$1.25 / 1M

Output

$2.50 / 1M

Context

Monthly cost

$200.00

Benchmark

1,447Top benchmarkLMArena Text Arena

VisionToolsJSONReasoningLong context

OpenAI: GPT-5.5

OpenAI API

xAI: Grok 4.3

OpenRouter

Input

$5.00 / 1M

$1.25 / 1MCheapest (this scenario)

Output

$30.00 / 1M

$2.50 / 1MCheapest (this scenario)

Context

1.1MLargest context

Benchmark

58.6%

SWE-Bench Pro

1,447Top benchmark

LMArena Text Arena

Monthly cost

$1,400.00

$200.00Cheapest (this scenario)

Capabilities

VisionToolsJSONReasoningLong context

FAQ

Model comparison notes

How do GPT-5.5 vs Grok 4.3 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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