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OpenAI: GPT-5.1

🇺🇸 OpenAI · GPT-5.1

Input Price $1.25 per million tokens NT$40.0
Output Price $10.00 per million tokens NT$320
Context Window 400K tokens Output limit: 128K
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Overview

OpenAI: GPT-5.1 is a large language model API from OpenAI, part of its GPT-5.1 model family. Priced at $1.25 per million input tokens and $10.00 per million output tokens, it occupies the mid-range, balancing capability against running cost. Output tokens cost about 8× as much as input, so prompt-heavy workloads run noticeably cheaper than generation-heavy ones. A large 400K-token context window (≈600 pages of text) lets it take in whole books, large codebases, or lengthy transcripts in a single call. Beyond plain text it also accepts Image, File input, so it can be applied to multimodal tasks rather than text alone. On Artificial Analysis's Intelligence Index it scores 37 (B 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 $1.25 NT$40.0
Output per 1M tokens $10.00 NT$320
Cached Input per 1M tokens $0.130 NT$4.2
Web Search per search $0.010 NT$0.32

Provider
OpenAI
Model Family
GPT-5.1
Version String
openai/gpt-5.1
Status
Active
Modality
Image, Text, File
Context Window
400,000 tokens
Output Limit
128,000 tokens

Index Metrics

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

Agentic Index 21 D Measured: 2026-07-01
Coding Index 49 A Measured: 2026-07-01
Intelligence Index 37 B Measured: 2026-07-01

Benchmark Scores

Data source: Artificial Analysis

AA-LCR 75.0% A Measured: 2026-07-01
GPQA Diamond 87.3% S Measured: 2026-07-01
HLE 26.5% A Measured: 2026-07-01
IFBench 72.9% B Measured: 2026-07-01
MMMU Pro 75.5% A Measured: 2026-07-01
Non-Hallucination 48.7% Measured: 2026-07-01
Omniscience Accuracy 37.6% Measured: 2026-07-01
SciCode 43.3% B Measured: 2026-07-01
Tau2 81.9% Measured: 2026-07-01
TerminalBench 45.5% Measured: 2026-07-01

Performance Metrics

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

First Token Latency 52.9s Measured: 2026-07-01
Output Speed 82 t/s Measured: 2026-07-01
Response Time 59.1s Measured: 2026-07-01

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 $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter
Output $10.00 OpenRouter
Input $1.25 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.130 OpenRouter

Key Insights

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

  • OpenAI: GPT-5.1 Input price: $1.25/M tokens
  • OpenAI: GPT-5.1 Output price: $10/M tokens
  • Context window: 400,000 tokens
  • Provider: OpenAI
  • Model family: GPT-5.1
  • Modalities: Image, Text, File
  • Data source: OpenRouter, updated daily