GPT-5.3 Codex | OpenAI Agentic Coding Model API

Name: GPT 5.3 Codex API
Brand: openai
Price: 1.75 USD
Availability: InStock

API 利用

以下のコード例を使用して API と連携してください:

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://llm.wavespeed.ai/v1"
)

response = client.chat.completions.create(
    model="openai/gpt-5.3-codex",
    messages=[
        {"role": "user", "content": "Hello!"}
    ]
)

print(response.choices[0].message.content)

モデル紹介

Openai gpt-5.3-codex

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broade

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results on SWE-Bench Pro and strong performance on Terminal-Bench 2.0 and OSWorld-Verified, reflecting improved multi-language coding, terminal proficiency, and real-world computer-use skills. The model is optimized for long-running, tool-using workflows and supports interactive steering during execution, making it suitable for complex development tasks, debugging, deployment, and iterative product work. Beyond coding, GPT-5.3-Codex performs strongly on structured knowledge-work benchmarks such as GDPval, supporting tasks like document drafting, spreadsheet analysis, slide creation, and operational research across domains. It is trained with enhanced cybersecurity awareness, including vulnerability identification capabilities, and deployed with ad

Why It Looks Great

Large Language Model architecture for efficient processing
400000 context window for long document handling
Competitive pricing at $1.7/$14.0 per million tokens

Key Features

Context Window: 400000 tokens
Max Output: 128000 tokens
Vision: Supported
Function Calling: Supported

Specifications

Specification	Value
Provider	Openai
Model Type	Large Language Model (LLM)
Architecture	N/A
Context Window	400000 tokens
Max Output	128000 tokens
Input	Text
Output	Text
Vision	Supported
Function Calling	Supported

Pricing

Token Type	Cost per Million Tokens
Input	$1.7
Output	$14.0

How to Use

Write your prompt — describe the task, provide context, and specify desired output format.
Submit — the model processes your request and returns the response.

API Integration

Base URL: https://llm.wavespeed.ai/v1 API Endpoint: chat/completions Model ID: openai/gpt-5.3-codex

API Usage

Python SDK

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://llm.wavespeed.ai/v1"
)

response = client.chat.completions.create(
    model="openai/gpt-5.3-codex",
    messages=[
        {"role": "user", "content": "Hello!"}
    ]
)

print(response.choices[0].message.content)

cURL

curl https://llm.wavespeed.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "openai/gpt-5.3-codex",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Notes

Model: openai/gpt-5.3-codex
Provider: Openai

GPT 5.3 Codex API

openai/gpt-5.3-codex

GPT 5.3 Codexに関するよくある質問

GPT 5.3 Codex API の料金はいくらですか?+

WaveSpeedAI の料金: 入力 100 万トークンあたり $1.75、出力 100 万トークンあたり $14.00。プロンプトキャッシュとバッチ処理は別途料金で、長く反復的なワークロードでは実効コストを下げられます。

GPT 5.3 Codex のコンテキストウィンドウはどのくらいですか?+

GPT 5.3 Codex はリクエストあたり最大 400K のコンテキストトークンと最大 128K の出力トークンをサポートします。

GPT 5.3 Codex は OpenAI 互換ですか?+

はい。WaveSpeedAI は OpenAI 互換エンドポイント https://llm.wavespeed.ai/v1 で GPT 5.3 Codex を提供します。公式 OpenAI SDK のベース URL をこちらに変更し WaveSpeedAI の API キーを設定するだけで利用可能です。

GPT 5.3 Codex を使い始めるには?+

WaveSpeedAI にサインインし、Access Keys で API キーを作成して、上に表示されているモデル ID を指定して https://llm.wavespeed.ai/v1/chat/completions にリクエストを送信してください。新規アカウントには GPT 5.3 Codex を試用できる無料クレジットが付与されます。

料金