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Comparison

GPT 5 Codex vs Claude Opus 4.6 Fast

Side-by-side comparison of OpenAI GPT 5 Codex and Anthropic Claude Opus 4.6 Fast. Pricing, quality benchmarks, and context windows.

Quality Benchmarks

LiveBench / 0-100

Coding94 / 68Math94 / 89Reasoning94 / 87Language94 / 70

GPT 5 Codex

94.0Frontier

Claude Opus 4.6 Fast

78.7Frontier

GPT 5 Codex
Claude Opus 4.6 Fast

Input Price (per 1M)

$1.25
96% less
$30.00

Output Price (per 1M)

$10.00
93% less
$150.00

Context Window

400K
1M
2.5x

Max Output

128K
128K

OpenAI

GPT 5 Codex

vs

Anthropic

Claude Opus 4.6 Fast

Pricing per 1M Tokens

$1.25

96% cheaper

Input

Input

$30.00

Input

$10.00

93% cheaper

Output

Output

$150.00

Output

Token Limits

Context

400K

Context

Context

1M

Max Output

128K

Max Output

Max Output

128K

VisionTools
VisionTools

GPT 5 Codex Details

$1.25 in / $10.00 out

Claude Opus 4.6 Fast Details

$30.00 in / $150.00 out

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More Comparisons

Top OpenAI pick

GPT 5 vs Claude Opus 4.6 Fast

$1.25/M in · Score 94

Top Anthropic pick

GPT 5 Codex vs Claude Opus 4

$15.00/M in · Score 97.8

OpenAI

GPT 5 Image vs Claude Opus 4.6 Fast$10.00/MGPT 5 Chat vs Claude Opus 4.6 Fast$1.25/MGPT 5.4 vs Claude Opus 4.6 Fast$2.50/MGPT 5.5 vs Claude Opus 4.6 Fast$5.00/M

Anthropic

GPT 5 Codex vs Claude Opus 4.7$5.00/MGPT 5 Codex vs Claude Opus 4.7 Fast$30.00/MGPT 5 Codex vs Claude Opus 4.6$5.00/MGPT 5 Codex vs Claude Sonnet 4.6$3.00/M