Price Per TokenPrice Per Token
OpenAI
OpenAI
vs
OpenAI
OpenAI

ChatGPT-4o vs GPT-5.3 Codex

A detailed comparison of pricing, benchmarks, and capabilities

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Key Takeaways

ChatGPT-4o wins:

  • Better at math

GPT-5.3 Codex wins:

  • Cheaper input tokens
  • Cheaper output tokens
  • Larger context window
  • Faster response time
  • Higher intelligence benchmark
  • Better at coding
  • Has reasoning mode
Price Advantage
GPT-5.3 Codex
Benchmark Advantage
GPT-5.3 Codex
Context Window
GPT-5.3 Codex
Speed
GPT-5.3 Codex

Pricing Comparison

Benchmark Comparison

Context & Performance

Capabilities

Feature Comparison

FeatureChatGPT-4oGPT-5.3 Codex
Vision (Image Input)
Tool/Function Calls
Reasoning Mode
Audio Input
Audio Output
PDF Input
Prompt Caching
Web Search

License & Release

PropertyChatGPT-4oGPT-5.3 Codex
LicenseProprietaryProprietary
AuthorOpenAIOpenAI
ReleasedUnknownFeb 2026

ChatGPT-4o Modalities

Input
Output

GPT-5.3 Codex Modalities

Input
textimage
Output
text

Related Comparisons

Compare ChatGPT-4o with:

Compare GPT-5.3 Codex with:

See all model comparisons

Frequently Asked Questions

GPT-5.3 Codex has cheaper input pricing at $1.75/M tokens. GPT-5.3 Codex has cheaper output pricing at $14.00/M tokens.
GPT-5.3 Codex scores higher on coding benchmarks with a score of 53.1, compared to ChatGPT-4o's score of N/A.
ChatGPT-4o has a 128,000 token context window, while GPT-5.3 Codex has a 400,000 token context window.
ChatGPT-4o supports vision. GPT-5.3 Codex supports vision.

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