Model Comparison

GPT-5.3 CodexOpenAI o4-mini
Let's see who can write code better - GPT-5.3 Codex or OpenAI o4-mini

Model Information

GPT-5.3 Codex

OpenAI

Description

Next-generation coding-optimized model from OpenAI with enhanced autonomous development capabilities

Specifications

Context Window272K
Max Output33K
ReleasedFeb 2026
API

Pricing (per 1M)

In / Out
$1.5/ $12

Key Features

Advanced autonomous codingEnhanced code reviewMulti-step reasoningFull-stack development

Strengths

  • State-of-the-art coding benchmarks
  • Superior autonomous task completion
  • Excellent code review capabilities
  • Large context window

Weaknesses

  • Premium pricing
  • Optimized for coding over general tasks

Agent Support

No known agents

OpenAI o4-mini

OpenAI

Description

Future iteration of reasoning models

Specifications

Context Window200K
Max Output66K
ReleasedJun 2025
API

Pricing (per 1M)

In / Out
$1.1/ $4.4

Key Features

Advanced reasoningFuture capabilitiesEfficient processing

Strengths

  • Next-gen reasoning
  • Improved efficiency
  • Better performance

Weaknesses

  • Not yet released
  • Purely speculative

Agent Support