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Comparison

Claude Opus 4 vs GPT 5.1

Side-by-side comparison of Anthropic Claude Opus 4 and OpenAI GPT 5.1. Pricing, quality benchmarks, and context windows.

Quality Benchmarks

LiveBench / 0-100

Coding98 / 61Math98 / 87Reasoning98 / 80Language98 / 69

Claude Opus 4

98.4Frontier

GPT 5.1

74.2Frontier

Claude Opus 4
GPT 5.1

Input Price (per 1M)

$15.00
$1.25
92% less

Output Price (per 1M)

$75.00
$10.00
87% less

Context Window

200K
400K
2.0x

Max Output

32K
128K
4.0x

Anthropic

Claude Opus 4

vs

OpenAI

GPT 5.1

Pricing per 1M Tokens

$15.00

Input

Input

$1.25

92% cheaper

Input

$75.00

Output

Output

$10.00

87% cheaper

Output

Token Limits

Context

200K

Context

Context

400K

Max Output

32K

Max Output

Max Output

128K

VisionTools
VisionTools

Claude Opus 4 Details

$15.00 in / $75.00 out

GPT 5.1 Details

$1.25 in / $10.00 out

Compare Models

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Anthropic

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OpenAI

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