Claude 2 vs 
GPT-5.3-Codex
GPT-5.3-Codex is cheaper than Claude 2 at $1.75/M vs $11.02/M input tokens.
Simple Falling Object Game
Catch the falling object. Paddle at the bottom, score at the top, one file.
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Which answer wins?
Written rounds
2 promptsSeven 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-5.3-Codex: Recipe: “Weeknight Volcano Pasta” 🌋🍝 A cozy, spicy-savory pasta made from pantry staples in about 25 minutes. Ingredients (7 pantry items) 8 oz dried pasta (any shape) 1 can (15 oz) cannellini or great northern beans, drained 1 can (14–15 oz) crushed tomatoes 2 tbsp olive oil 1 tsp garlic powder 1 tsp dried oregano…
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-5.3-Codex: Great goal. Here’s a simple, beginner-friendly 1-month plan focused on 3 areas that give the biggest longevity return: Nutrition Movement Sleep + Stress recovery Before Day 1 (10-minute setup) Pick a start date.
Price and specs
Not enough votes to call it. On the specs, GPT-5.3-Codex has the edge: bigger model tier, newer, bigger context window.
| Spec | Claude 2 | GPT-5.3-Codex |
|---|---|---|
| Input price | $11.02/M tokens | $1.75/M tokens |
| Output price | $32.68/M tokens | $14/M tokens |
| Context window | 100K tokens | 400K tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Jun 2023 | Feb 2026 |
| At 10M a month | $110 | $17.50 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Claude 2
No hosts listed on OpenRouter.
GPT-5.3-Codex2 hosts
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between Claude 2 and GPT-5.3-Codex?
Claude 2 is developed by Anthropic while GPT-5.3-Codex is developed by OpenAI. Claude 2 has a 100K token context window vs GPT-5.3-Codex's 400K. 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-5.3-Codex?
It depends on your use case. Claude 2 and GPT-5.3-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 much does Claude 2 cost compared to GPT-5.3-Codex?
Claude 2 costs $11.02/M input tokens and GPT-5.3-Codex costs $1.75/M input tokens. GPT-5.3-Codex is $9.27/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.
How can I compare Claude 2 and GPT-5.3-Codex on Rival?
This page shows a side-by-side comparison of Claude 2 and GPT-5.3-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.
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