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Comparison

GPT 5 Codex vs Claude Opus 4.5

Side-by-side comparison of OpenAI GPT 5 Codex and Anthropic Claude Opus 4.5. Pricing, quality benchmarks, and context windows.

Quality Benchmarks

LiveBench / 0-100

Coding92 / 70Math92 / 90Reasoning92 / 84Language92 / 68

GPT 5 Codex

91.5Frontier

Claude Opus 4.5

78.0Frontier

GPT 5 Codex
Claude Opus 4.5

Input Price (per 1M)

$1.25
75% less
$5.00

Output Price (per 1M)

$10.00
60% less
$25.00

Context Window

400K
2.0x
200K

Max Output

128K
2.0x
64K

OpenAI

GPT 5 Codex

vs

Anthropic

Claude Opus 4.5

Pricing per 1M Tokens

$1.25

75% cheaper

Input

Input

$5.00

Input

$10.00

60% cheaper

Output

Output

$25.00

Output

Token Limits

Context

400K

Context

Context

200K

Max Output

128K

Max Output

Max Output

64K

VisionTools
VisionTools

GPT 5 Codex Details

$1.25 in / $10.00 out

Claude Opus 4.5 Details

$5.00 in / $25.00 out

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GPT 5 vs Claude Opus 4.5

$1.25/M in · Score 91.5

Top Anthropic pick

GPT 5 Codex vs Claude Opus 4

$15.00/M in · Score 98.4

OpenAI

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Anthropic

GPT 5 Codex vs Claude Opus 4.6$5.00/MGPT 5 Codex vs Claude Sonnet 4.6$3.00/MGPT 5 Codex vs Claude 3.7 Sonnet$3.00/MGPT 5 Codex vs Claude 3.5 Sonnet$6.00/M