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Comparison

GPT 5.5 vs GPT 5.1 Codex Max

Side-by-side comparison of OpenAI GPT 5.5 and OpenAI GPT 5.1 Codex Max. Pricing, quality benchmarks, and context windows.

Quality Benchmarks

LiveBench / 0-100

Coding67 / 46Math96 / 56Reasoning92 / 39Language77 / 30

GPT 5.5

83.0Frontier

GPT 5.1 Codex Max

42.7Good

GPT 5.5
GPT 5.1 Codex Max

Input Price (per 1M)

$5.00
$1.25
75% less

Output Price (per 1M)

$30.00
$10.00
67% less

Context Window

1.1M
2.6x
400K

Max Output

128K
128K

OpenAI

GPT 5.5

vs

OpenAI

GPT 5.1 Codex Max

Pricing per 1M Tokens

$5.00

Input

Input

$1.25

75% cheaper

Input

$30.00

Output

Output

$10.00

67% cheaper

Output

Token Limits

Context

1.1M

Context

Context

400K

Max Output

128K

Max Output

Max Output

128K

VisionTools
VisionTools

GPT 5.5 Details

$5.00 in / $30.00 out

GPT 5.1 Codex Max Details

$1.25 in / $10.00 out

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