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Comparison

Claude Opus 4.6 Fast vs GPT 5.1

Side-by-side comparison of Anthropic Claude Opus 4.6 Fast and OpenAI GPT 5.1. Pricing, quality benchmarks, and context windows.

Quality Benchmarks

LiveBench / 0-100

Coding68 / 61Math89 / 87Reasoning87 / 80Language70 / 69

Claude Opus 4.6 Fast

78.7Frontier

GPT 5.1

74.2Frontier

Claude Opus 4.6 Fast
GPT 5.1

Input Price (per 1M)

$30.00
$1.25
96% less

Output Price (per 1M)

$150.00
$10.00
93% less

Context Window

1M
2.5x
400K

Max Output

128K
128K

Anthropic

Claude Opus 4.6 Fast

vs

OpenAI

GPT 5.1

Pricing per 1M Tokens

$30.00

Input

Input

$1.25

96% cheaper

Input

$150.00

Output

Output

$10.00

93% cheaper

Output

Token Limits

Context

1M

Context

Context

400K

Max Output

128K

Max Output

Max Output

128K

VisionTools
VisionTools

Claude Opus 4.6 Fast Details

$30.00 in / $150.00 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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