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OpenAI: GPT-5.3-Codex

🇺🇸 OpenAI · GPT-5.3-Codex

Input Price $1.75 per million tokens NT$56.0
Output Price $14.00 per million tokens NT$448
Context Window 400K tokens Output limit: 128K
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Overview

OpenAI: GPT-5.3-Codex is a large language model API from OpenAI, part of its GPT-5.3-Codex model family. With $1.75 per million input tokens and $14.00 per million output tokens, it is a premium-tier model where output volume is the main cost to watch. 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 44 (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 $1.75 NT$56.0
Output per 1M tokens $14.00 NT$448
Cached Input per 1M tokens $0.175 NT$5.6
Web Search per search $0.010 NT$0.32

Provider
OpenAI
Model Family
GPT-5.3-Codex
Version String
openai/gpt-5.3-codex
Status
Active
Modality
Text, Image, File
Context Window
400,000 tokens
Output Limit
128,000 tokens

Index Metrics

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

Intelligence Index 44 B Measured: 2026-07-01

Benchmark Scores

Data source: Artificial Analysis

AA-LCR 74.0% B Measured: 2026-07-01
GPQA Diamond 91.5% S Measured: 2026-07-01
HLE 39.9% S Measured: 2026-07-01
IFBench 75.4% A Measured: 2026-07-01
IFBench 75.4% A Measured: 2026-07-01
MMMU Pro 78.5% A Measured: 2026-07-01
Non-Hallucination 13.1% Measured: 2026-07-01
Omniscience Accuracy 51.8% Measured: 2026-07-01
SciCode 53.2% A Measured: 2026-07-01
Tau2 86.0% Measured: 2026-07-01
TerminalBench 53.0% Measured: 2026-07-01

Performance Metrics

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

First Token Latency 100.6s Measured: 2026-07-01
Output Speed 91 t/s Measured: 2026-07-01
Response Time 106.1s Measured: 2026-07-01

Use Case Analysis

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

Strength

  • Specialized Coding Model Optimized for code generation and software engineering tasks with strong performance on SWE-Bench Pro. Official

Best For

  • Legacy Coding Workflows Existing systems that depend on GPT-5.3-Codex behavior. Official

Not Recommended

  • New Development For new coding projects, use GPT-5.5 or GPT-5.4. 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 $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter
Output $14.00 OpenRouter
Input $1.75 OpenRouter
Web Search $0.010 OpenRouter
Cached Input $0.175 OpenRouter

Key Insights

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

  • OpenAI: GPT-5.3-Codex Input price: $1.75/M tokens
  • OpenAI: GPT-5.3-Codex Output price: $14/M tokens
  • Context window: 400,000 tokens
  • Provider: OpenAI
  • Model family: GPT-5.3-Codex
  • Modalities: Text, Image, File
  • Data source: OpenRouter, updated daily