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OpenAI: GPT-5.5

🇺🇸 OpenAI · GPT-5.5

Input Price $5.00 per million tokens NT$160
Output Price $30.00 per million tokens NT$960
Context Window 1.05M tokens Output limit: 128K
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Overview

OpenAI: GPT-5.5 is a large language model API from OpenAI, part of its GPT-5.5 model family. With $5.00 per million input tokens and $30.00 per million output tokens, it is a premium-tier model where output volume is the main cost to watch. Output tokens cost about 6× as much as input, so prompt-heavy workloads run noticeably cheaper than generation-heavy ones. An exceptionally large 1.05M-token context window (≈1,575 pages of text) means entire repositories or document collections can be processed without chunking. Beyond plain text it also accepts File, Image input, so it can be applied to multimodal tasks rather than text alone. On Artificial Analysis's Intelligence Index it scores 55 (A grade), a useful proxy for its general reasoning strength relative to the other models tracked here. All prices on this page reflect OpenRouter's routed rates and are re-synced automatically every day; confirm against the provider's official pricing before committing to production.

Dimension Unit Price (USD) Price (TWD) Effective From
Input per 1M tokens $5.00 NT$160
Output per 1M tokens $30.00 NT$960
Cached Input per 1M tokens $0.500 NT$16.0
Web Search per search $0.010 NT$0.32

Provider
OpenAI
Model Family
GPT-5.5
Version String
openai/gpt-5.5
Status
Active
Modality
File, Image, Text
Context Window
1,050,000 tokens
Output Limit
128,000 tokens

Index Metrics

Cross-domain capability indexes evaluated by Artificial Analysis — Artificial Analysis

Agentic Index 45 B Measured: 2026-07-01
Coding Index 75 S Measured: 2026-07-01
Intelligence Index 55 A Measured: 2026-07-01

Benchmark Scores

Data source: Artificial Analysis

AA-LCR 74.3% B Measured: 2026-07-01
GPQA Diamond 93.5% S Measured: 2026-07-01
HLE 44.3% S Measured: 2026-07-01
IFBench 75.8% A Measured: 2026-07-01
MMMU Pro 79.9% A Measured: 2026-07-01
Non-Hallucination 14.5% Measured: 2026-07-01
Omniscience Accuracy 56.9% Measured: 2026-07-01
SciCode 56.1% A Measured: 2026-07-01
Tau2 93.9% Measured: 2026-07-01
TerminalBench 60.6% Measured: 2026-07-01

Performance Metrics

Real-world benchmarks, updated every 72 hours by Artificial Analysis — Artificial Analysis

First Token Latency 81.7s Measured: 2026-07-01
Output Speed 77 t/s Measured: 2026-07-01
Response Time 88.2s Measured: 2026-07-01

Use Case Analysis

Model strengths, weaknesses, and ideal use cases based on benchmarks and official documentation

Strength

  • Frontier Reasoning & Coding OpenAI smartest model. Terminal-Bench 2.0 82.7%, SWE-Bench Pro 58.6%. Official
  • Token Efficiency More intelligent and much more token efficient than GPT-5.4. Better results with fewer tokens. Official

Best For

  • Complex Professional Work Coding use cases, tool-heavy agents, grounded assistants, long-context retrieval. Official
  • Agentic Workflows Tool-heavy or long-running workflows requiring sustained reasoning and multi-turn interactions. Official

Weakness

  • Higher Pricing $5 per 1M input tokens and $30 per 1M output tokens. Official

Not Recommended

  • Cost-Sensitive Workloads Use GPT-5.4 or GPT-5.4-mini for better cost-efficiency. Official

90-Day Price Trend

Input / Output price (USD per 1M tokens)

Past 90 days of records; every price change is shown here

Date Dimension Price (USD) Source
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter
Output $30.00 OpenRouter
Input $5.00 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.500 OpenRouter

Key Insights

Key data points from this page for quick reference and citation.

  • OpenAI: GPT-5.5 Input price: $5/M tokens
  • OpenAI: GPT-5.5 Output price: $30/M tokens
  • Context window: 1,050,000 tokens
  • Provider: OpenAI
  • Model family: GPT-5.5
  • Modalities: File, Image, Text
  • Data source: OpenRouter, updated daily