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GPT-5.2 Codex (xhigh)

OpenAI

ReasoningVision ModelProprietary

Analysis of OpenAI's GPT-5.2 Codex (xhigh) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.

Context

Release Date
Dec 11, 2025
Knowledge Cutoff
Aug 31, 2025
Window
400k

PricingPer 1M tokens

Input
$1.75
Output
$14
Blended 3:1
$4.8125

Capabilities

Speed
139 t/s
Input
Output
Reasoning tokens

Latency

TTFT
32.02 ms
500 token response
35.62 s

Benchmarks

Reasoning
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Coding
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GPQA
89.9%
HLE
33.5%
SciCode
54.6%

Analysis of OpenAI's GPT-5.2 Codex (xhigh) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.