Model Comparison

GPT-5.3 CodexGPT-5 Nano
Let's see who can write code better - GPT-5.3 Codex or GPT-5 Nano

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

GPT-5 Nano

OpenAI

Description

Ultra-lightweight version of GPT-5

Specifications

Context Window272K
Max Output4K
ReleasedJun 2025
API

Pricing (per 1M)

In / Out
$0.05/ $0.4

Key Features

Minimal resource usageEdge deployment readyBasic GPT-5 capabilities

Strengths

  • Very low cost
  • Fast responses
  • Good for simple tasks

Weaknesses

  • Not yet released
  • Limited capabilities

Agent Support