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Comparison

Claude 3.5 Sonnet vs GPT 5.1

Side-by-side comparison of Anthropic Claude 3.5 Sonnet and OpenAI GPT 5.1. Pricing, quality benchmarks, and context windows.

Quality Benchmarks

LiveBench / 0-100

Coding75 / 61Math75 / 87Reasoning75 / 80Language75 / 69

Claude 3.5 Sonnet

75.3Frontier

GPT 5.1

74.2Frontier

Claude 3.5 Sonnet
GPT 5.1

Input Price (per 1M)

$6.00
$1.25
79% less

Output Price (per 1M)

$30.00
$10.00
67% less

Context Window

200K
400K
2.0x

Max Output

8.2K
128K
15.6x

Anthropic

Claude 3.5 Sonnet

vs

OpenAI

GPT 5.1

Pricing per 1M Tokens

$6.00

Input

Input

$1.25

79% cheaper

Input

$30.00

Output

Output

$10.00

67% cheaper

Output

Token Limits

Context

200K

Context

Context

400K

Max Output

8.2K

Max Output

Max Output

128K

VisionTools
VisionTools

Claude 3.5 Sonnet Details

$6.00 in / $30.00 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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