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OpenAI: GPT-5.1-Codex

🇺🇸 OpenAI · GPT-5.1-Codex

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-Codex is a large language model API from OpenAI, part of its GPT-5.1-Codex 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 input, so it can be applied to multimodal tasks rather than text alone. On Artificial Analysis's Intelligence Index it scores 35 (C 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-Codex
Version String
openai/gpt-5.1-codex
Status
Active
Modality
Text, Image
Context Window
400,000 tokens
Output Limit
128,000 tokens

Index Metrics

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

Intelligence Index 35 C Measured: 2026-07-01

Benchmark Scores

Data source: Artificial Analysis

AA-LCR 67.3% B Measured: 2026-07-01
GPQA Diamond 86.0% S Measured: 2026-07-01
HLE 23.4% A Measured: 2026-07-01
IFBench 70.0% B Measured: 2026-07-01
IFBench 70.0% B Measured: 2026-07-01
MMMU Pro 72.5% B Measured: 2026-07-01
Non-Hallucination 25.6% Measured: 2026-07-01
Omniscience Accuracy 39.2% Measured: 2026-07-01
SciCode 40.2% B Measured: 2026-07-01
Tau2 83.0% Measured: 2026-07-01
TerminalBench 34.8% Measured: 2026-07-01

Performance Metrics

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

First Token Latency 4.6s Measured: 2026-07-01
Output Speed 167 t/s Measured: 2026-07-01
Response Time 7.6s Measured: 2026-07-01

Use Case Analysis

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

Strength

  • Agentic Coding Optimization Specifically trained for agentic coding tasks in Codex environments. Better at sustained long-horizon coding. Official

Best For

  • Long-running Coding Agents Complex refactors, multi-hour agent loops, and sustained coding work in Codex. Official

Not Recommended

  • General Purpose Tasks Use GPT-5 or GPT-5.5 for non-coding tasks. 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 $0.130 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-Codex Input price: $1.25/M tokens
  • OpenAI: GPT-5.1-Codex Output price: $10/M tokens
  • Context window: 400,000 tokens
  • Provider: OpenAI
  • Model family: GPT-5.1-Codex
  • Modalities: Text, Image
  • Data source: OpenRouter, updated daily