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GPT-5 Codex (high)

OpenAI

ReasoningVision ModelProprietary

Analysis of OpenAI's GPT-5 Codex (high) 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
Sep 23, 2025
Knowledge Cutoff
Sep 30, 2024
Window
400k

PricingPer 1M tokens

Input
$1.25
Output
$10
Blended 3:1
$3.4375

Capabilities

Speed
160 t/s
Input
Output
Reasoning tokens

Latency

TTFT
12.46 ms
500 token response
15.59 s

Benchmarks

Reasoning
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Math
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Coding
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MMLU Pro
86.5%
GPQA
83.7%
HLE
25.6%
SciCode
40.9%
AIME
98.7%
LiveCodeBench
84.0%

Analysis of OpenAI's GPT-5 Codex (high) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.