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  1. Home/
  2. Compare/
  3. Claude 2 vs GPT-5 Codex
Updated Sep 2025

Claude 2 vs GPT-5 Codex

GPT-5 Codex is the newer model, released after Claude 2.

Simple Falling Object Game

Catch the falling object. Paddle at the bottom, score at the top, one file.

Loading the build
Claude 2
Loading the build
GPT-5 Codex

Which answer wins?

Written rounds

2 prompts
  • Seven pantry ingredients, one dish, and a name worth saying out loud.

    Claude 2: Here is a 7-ingredient recipe for a sweet dish I'll call "Cinnamon Apple Surprise": Cinnamon Apple Surprise Ingredients: 3 apples, cored and sliced 1⁄4 cup brown sugar 1⁄4 cup all-purpose flour 1 tsp ground cinnamon 1⁄4 tsp nutmeg 2 tbsp butter, melted 1 refrigerated pie crust Instructions: Preheat oven to 375°F.

    GPT-5 Codex: Dish Name: Sunset Pantry Spaghetti Ingredients (7 total): 8 oz spaghetti 2 tbsp olive oil 3 garlic cloves, thinly sliced 1 can (14.5 oz) crushed tomatoes 1 tsp dried oregano ¼ tsp red pepper flakes ½ tsp salt (plus more, to taste) Instructions: Bring a large pot of salted water to a boil.

    Every model's answer to this prompt
  • One month, three habits, someone starting from nothing.

    Claude 2: Here is a 1-month beginner health and longevity plan focused on diet, exercise, and sleep: Diet: Eliminate sugary drinks and limit sweets. Replace with water and fruits. Eat more veggies. Aim for 1-2 cups with each meal. Focus on dark leafy greens, broccoli, carrots. Increase fiber intake.

    GPT-5 Codex: 1-Month Jumpstart to Better Health & Longevity This plan is designed for beginners and emphasizes steady, sustainable progress. It focuses on three key areas: diet, movement, and sleep & stress. Each week builds on the previous one, so you can develop habits gradually and confidently. 🥗 1.

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, GPT-5 Codex has the edge: bigger model tier, newer.

Claude 2 and GPT-5 Codex compared across 5 shared prompts
SpecClaude 2GPT-5 Codex
Input price$11.02/M tokens—
Output price$32.68/M tokens—
Context window100K tokens—
Free API (OpenRouter)NoNo
ReleasedJun 2023Sep 2025
At 10M a month$110$110–not listed
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Common questions

What is the difference between Claude 2 and GPT-5 Codex?

Claude 2 is developed by Anthropic while GPT-5 Codex is developed by OpenAI. You can compare their actual outputs across 5 challenges on Rival to see how they differ in practice.

Which is better, Claude 2 or GPT-5 Codex?

It depends on your use case. Claude 2 and GPT-5 Codex each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 5 challenges so you can judge which fits your needs best.

How can I compare Claude 2 and GPT-5 Codex on Rival?

This page shows a side-by-side comparison of Claude 2 and GPT-5 Codex across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

More comparisons

Against the newest arrivals

  • Claude 2 vs Gemini 4 ArgonLanded Oct 2026
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  • GPT-5 Codex vs Step 5 PreviewLanded Oct 2026
  • Claude 2 vs Claude Haiku 5.5Landed Oct 2026
  • GPT-5 Codex vs Ling 3.1 FlashLanded Oct 2026
  • Claude 2 vs Mistral Large 4Landed Oct 2026
  • GPT-5 Codex vs GPT-6.1 SolLanded Sep 2026

Same lab, same size, long tail

  • Claude 2 vs Claude Sonnet 5.5Version compare
  • Claude 2 vs Claude Opus 5.5Same lab
  • GPT-5 Codex vs GPT-4 TurboSame lab
  • GPT-5 Codex vs GPT-6 Luna ProSame lab
  • Claude 2 vs GLM 5.1Same size
  • Claude 2 vs GLM 5.2New provider
  • Claude 2 vs GLM 5.3Same size
  • Claude 2 vs GLM 5.3 FlashSame size

Model pages

  • Claude 25 outputs, specs and price
  • GPT-5 Codex50 outputs, specs and price
Workshop · 150 skills

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Editable skills and working examples for your agent.

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Rival
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Explore all of Rival

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  • Compare models
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  • Image generation
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Discover

  • SubjectiveBench
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  • Research downloads
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  • Find your AI taste
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