GPT-5.5 (xhigh)

OpenAIUnited States

GPT-5.5 (xhigh) is a high-performance variant of OpenAI's GPT-5 series, optimized for superior reasoning, complex code generation, and advanced multimodal tasks. It represents a flagship model designed for demanding applications requiring top-tier intelligence and capability.

CodingReasoningMultimodal

Input / 1M tokens

$5.00

Output / 1M tokens

$30.00

Output tokens/s

63.03

First-token seconds

35.79s

Supported plans

Benchmark history

Evaluations

Tau Banking

Measured Jul 10, 2026Source

Score

0.31

TAU2

Measured Jul 10, 2026Source

Score

0.94

Terminalbench V2 1

Measured Jul 10, 2026Source

Score

0.84

Terminalbench Hard

Measured Jul 10, 2026Source

Score

0.61

Lcr

Measured Jul 10, 2026Source

Score

0.74

Ifbench

Measured Jul 10, 2026Source

Score

0.76

Scicode

Measured Jul 10, 2026Source

Score

0.56

Hle

Measured Jul 10, 2026Source

Score

0.44

Gpqa

Measured Jul 10, 2026Source

Score

0.94

Artificial Analysis Coding Index

Measured Jul 10, 2026Source

Score

74.9

Artificial Analysis Intelligence Index

Measured Jul 10, 2026Source

Score

54.8

Plan availability

Products and plans that support this model

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

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 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.