Claude Sonnet 4 vs Claude Opus 4.7 vs GPT-5.5, API pricing and model comparison

Compare Claude Sonnet 4 vs Claude Opus 4.7 vs GPT-5.5 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 vs Claude Opus 4.7 vs GPT-5.5 in one matrix. Current records: Claude Sonnet 4 on OpenRouter: $3/$15 per 1M tokens, 1000K context window; Claude Opus 4.7 on Claude API: $5/$25 per 1M tokens, 1000K context window; GPT-5.5 on OpenAI API: $5/$30 per 1M tokens, 1050K context window. Prices are estimates—verify official provider pages before production use.

Claude Sonnet 4

anthropic/claude-sonnet-4

OpenRouter

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

Claude Opus 4.7

claude-opus-4-7

Claude API

Input: $5.00 / 1M
Output: $25.00 / 1M
Context: 1m
Model page: Details

GPT-5.5

gpt-5.5

OpenAI API

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

Comparison matrixLLM Table

Models to compare3/4

Model 1

Select model344 models

Model 2

Select model344 models

Model 3

1.1M

Select model344 models

Anthropic: Claude Sonnet 4

OpenRouter

Cheapest (this scenario)

Input

$3.00 / 1M

Output

$15.00 / 1M

Context

Monthly cost

$750.00

Benchmark

1,207LMArena Vision Arena

VisionToolsReasoningLong context

Anthropic: Claude Opus 4.7

Claude API

Input

$5.00 / 1M

Output

$25.00 / 1M

Context

Monthly cost

$1,250.00

Benchmark

1,500Top benchmarkLMArena Text Arena

VisionToolsReasoningLong context

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

Anthropic: Claude Sonnet 4

OpenRouter

Anthropic: Claude Opus 4.7

Claude API

OpenAI: GPT-5.5

OpenAI API

Input

$3.00 / 1MCheapest (this scenario)

$5.00 / 1M

Output

$15.00 / 1MCheapest (this scenario)

$25.00 / 1M

$30.00 / 1M

Context

1.1MLargest context

Benchmark

1,207

LMArena Vision Arena

1,500Top benchmark

LMArena Text Arena

58.6%

SWE-Bench Pro

Monthly cost

$750.00Cheapest (this scenario)

$1,250.00

$1,400.00

Capabilities

VisionToolsReasoningLong context

VisionToolsJSONReasoningLong context

FAQ

Model comparison notes

How do Claude Sonnet 4 vs Claude Opus 4.7 vs GPT-5.5 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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