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gpt-5.3-codex vs gpt-5.4

Compare gpt-5.3-codex from openai and gpt-5.4 from openai side by side — pricing, context window, features, and provider availability.

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gpt-5.3-codex

gpt-5.3-codex

By : openai

GPT‑5.3‑Codex is OpenAI’s most capable agentic coding model, designed to handle not just code generation but longer, end‑to‑end work on a computer. It combines the frontier coding strength of GPT‑5.2‑Codex with the reasoning and professional knowledge capabilities of GPT‑5.2, and is engineered to run faster (about 25% faster in Codex). It’s built for long‑running, multi‑step tasks that can include research, tool use, debugging, and complex execution, while staying interactive—so you can steer it, ask questions, and refine direction as it works without losing context. In evaluations, it sets new highs on software engineering and agentic benchmarks (including SWE‑Bench Pro and Terminal‑Bench 2.0) and shows strong results on OSWorld‑Verified and GDPval. It’s also deployed with strengthened cybersecurity safeguards and is trained to help identify software vulnerabilities.

gpt-5.4

gpt-5.4

By : openai

GPT‑5.4, released March 5, 2026, is OpenAI’s newest frontier model aimed at complex professional work. It’s available in the API as gpt-5.4 and in ChatGPT as GPT‑5.4 Thinking, with a higher-end GPT‑5.4 Pro tier for maximum performance. It supports adjustable deliberation through reasoning.effort, letting developers trade latency/cost for deeper reasoning. The model accepts text and image inputs and produces text output, with a 1,050,000‑token context window and up to 128,000 output tokens; its published knowledge cutoff is Aug 31, 2025. OpenAI also published a system card describing new cybersecurity-focused mitigations for the Thinking variant.

Model Overview

Feature
openaigpt-5.3-codex
openaigpt-5.4
Input Context Window
The number of tokens supported by the input context window.
400K
tokens
1.1M
tokens
Maximum Output Tokens
The number of tokens that can be generated by the model in a single request.
128K
tokens
128K
tokens
Release Date
When the model was first released.
February 6, 2026
8 months ago
March 5, 2026
7 months ago
Input Type
The types of inputs the model can process.
Output Type
The types of outputs the model can process.
gpt-5.4 offers a larger context window (1,050,000 tokens vs 400,000 tokens). gpt-5.3-codex is more affordable for input tokens ($1.75/M vs $2.5/M). gpt-5.3-codex is cheaper for output tokens ($14/M vs $15/M).

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How to use gpt-5.3-codex or gpt-5.4

Simply change the model name to gpt-5.3-codex or gpt-5.4 to adjust the model. 开桥 normalizes requests and responses across providers for you.

from openai import OpenAI

client = OpenAI(
  base_url="https://openqiao.com/api/v1",
  api_key="<OPENQIAO_API_KEY>",
)

# Chat Completion
completion = client.chat.completions.create(
  model="gpt-5.3-codex",
  messages=[
    {
      "role": "user",
      "content": "What is the meaning of life?"
    }
  ]
)
print(completion.choices[0].message.content)

# Responses API
responses = client.responses.create(
  model="gpt-5.3-codex",
  input="What is the meaning of life?"
)
print(responses)

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