Model Comparison

GPT-5.3 CodexClaude Opus 4.6
Let's see who can write code better - GPT-5.3 Codex or Claude Opus 4.6

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

Claude Opus 4.6

Anthropic

Description

Latest flagship Claude model with breakthrough coding and agentic capabilities

Specifications

Context Window200K
Max Output16K
ReleasedFeb 2026
API

Pricing (per 1M)

In / Out
$5/ $25

Key Features

Breakthrough reasoningAdvanced agentic codingComplex problem solvingMulti-language supportVision capabilities

Strengths

  • State-of-the-art coding performance
  • Superior agentic task handling
  • Excellent at long-horizon tasks
  • Most capable Claude model to date

Weaknesses

  • Premium pricing
  • Slower response times
  • Overkill for simple tasks

Agent Support

No known agents