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GPT-5.3 Codex (xhigh)

OpenAI

Frontier ModelReasoningVision ModelProprietary

Analysis of OpenAI's GPT-5.3 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
Feb 05, 2026
Knowledge Cutoff
Aug 31, 2025
Window
400k

PricingPer 1M tokens

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

Capabilities

Speed
94 t/s
Input
Output
Reasoning tokens

Latency

TTFT
80.50 ms
500 token response
85.84 s

Benchmarks

Reasoning
●●●○○
Coding
●●●○○
GPQA
91.5%
HLE
39.9%
SciCode
53.2%

Analysis of OpenAI's GPT-5.3 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.