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Comparison

GPT 5 Chat vs Claude Opus 4.8 Fast

Side-by-side comparison of OpenAI GPT 5 Chat and Anthropic Claude Opus 4.8 Fast. Pricing, quality benchmarks, and context windows.

Quality Benchmarks

LiveBench / 0-100

Coding68Math95Reasoning93Language71

GPT 5 Chat

Not benchmarked

Claude Opus 4.8 Fast

81.8Frontier

GPT 5 Chat
Claude Opus 4.8 Fast

Input Price (per 1M)

$1.25
88% less
$10.00

Output Price (per 1M)

$10.00
80% less
$50.00

Context Window

128K
1M
7.8x

Max Output

16.4K
128K
7.8x

OpenAI

GPT 5 Chat

vs

Anthropic

Claude Opus 4.8 Fast

Pricing per 1M Tokens

$1.25

88% cheaper

Input

Input

$10.00

Input

$10.00

80% cheaper

Output

Output

$50.00

Output

Token Limits

Context

128K

Context

Context

1M

Max Output

16.4K

Max Output

Max Output

128K

Vision
VisionTools

GPT 5 Chat Details

$1.25 in / $10.00 out

Claude Opus 4.8 Fast Details

$10.00 in / $50.00 out

Compare Models

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Anthropic

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