TAU2
Measured May 14, 2026Source
Score
0.87
Models9 3 
GPT-5.4 (xhigh)
OpenAIOpenAIUnited States
GPT-5.4 (xhigh) is a high-performance variant within OpenAI's GPT-5 series, designed for advanced reasoning, complex coding tasks, and multimodal understanding. It likely supports extended context windows and excels in generating nuanced, high-quality outputs.
CodingReasoningLong contextMultimodal
Input / 1M tokens
$2.50Output / 1M tokens
$15.00Output tokens/s
84.62First-token seconds
158.79sSupported plans
16Benchmark history
Evaluations
Terminalbench Hard
Measured May 14, 2026Source
Score
0.58
Lcr
Measured May 14, 2026Source
Score
0.74
Ifbench
Measured May 14, 2026Source
Score
0.74
Scicode
Measured May 14, 2026Source
Score
0.57
Hle
Measured May 14, 2026Source
Score
0.42
Gpqa
Measured May 14, 2026Source
Score
0.92
Artificial Analysis Coding Index
Measured May 14, 2026Source
Score
57.2
Artificial Analysis Intelligence Index
Measured May 14, 2026Source
Score
56.8
Plan availability
Products and plans that support this model
Apertis Coding Plan
Apertis Coding Plan
Apertis Coding Plan is a subscription-based AI coding service providing unified access to 30+ AI models (GPT-5.4, Claude Opus 4.6, Gemini 3.1 Pro, and more) through a single API key. Designed for developers using coding agents like Claude Code, Cursor, Cline, and OpenCode, it offers predictable monthly pricing, free prompt caching, auto-failover, and quota-based billing across OpenAI, Anthropic, Google, and other providers.
Codex
Codex
OpenAI's Codex is an AI coding agent that helps developers build and ship software by handling tasks end-to-end, including code generation, refactoring, and review. It integrates with IDEs, CLI, and web, powered by ChatGPT for individual and team workflows.
Command Code AI
Command Code AI
Command Code AI is a frontier AI coding agent that runs in the terminal and continuously learns your coding taste. It supports multiple premium and open-source models, providing code generation, bug fixing, testing, and refactoring with personalized style preferences. Starts at $1/month.
Discussion
Thinking... Make sure you are connected to GitHub server