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GPT-5.1 Codex (high)

OpenAI

ReasoningVision ModelProprietary

Analysis of OpenAI's GPT-5.1 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
Nov 13, 2025
Knowledge Cutoff
Sep 30, 2024
Window
400k

PricingPer 1M tokens

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

Capabilities

Speed
174 t/s
Input
Output
Reasoning tokens

Latency

TTFT
7.31 ms
500 token response
10.19 s

Benchmarks

Reasoning
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Math
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Coding
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MMLU Pro
86.0%
GPQA
86.0%
HLE
23.4%
SciCode
40.2%
AIME
95.7%
LiveCodeBench
84.9%

Analysis of OpenAI's GPT-5.1 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.