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  1. Home/
  2. Compare/
  3. Claude 2 vs Claude Sonnet 5.5
Updated Sep 2026

Claude 2 vs Claude Sonnet 5.5

Claude Sonnet 5.5 is cheaper than Claude 2 at $2/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.

Loading the build
Claude 2
Loading the build
Claude Sonnet 5.5

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.

    Claude Sonnet 5.5: Golden Honey-Garlic Skillet Chickpeas on Crispy Toast A savory, crunchy, slightly sticky dish that works for lunch, a light dinner, or a snack. Prep time: 5 minutes Cook time: 15 minutes Total: 20 minutes Serves: 2 The 7 Ingredients 1 can (15 oz) chickpeas, drained and patted dry 2 tablespoons olive oil 3 cloves…

    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.

    Claude Sonnet 5.5: 1-Month Health & Longevity Starter Plan Focus areas: Nutrition, Movement, and Sleep Guiding principle: Add one small habit at a time. Consistency beats intensity. Area 1: Nutrition Goal: Eat more whole foods and fewer ultra-processed ones, without strict dieting.

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, Claude Sonnet 5.5 has the edge: newer, bigger context window. Claude Sonnet 5.5 costs 3.3x less per token.

Claude 2 and Claude Sonnet 5.5 compared across 5 shared prompts
SpecClaude 2Claude Sonnet 5.5
Input price$11.02/M tokens$2/M tokens
Output price$32.68/M tokens$10/M tokens
Context window100K tokens1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedJun 2023Sep 2026
At 10M a month$110$110$20.00$20.00
1M10M100M1B10M tokens

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

Where to run it4 hosts
Claude 2

No hosts listed on OpenRouter.

Claude Sonnet 5.54 hosts
HostInOutContextUptime
  • Amazon Bedrock$2.00 in·$10.00 out·1M·100% up
  • Azure AI Foundry$2.00 in·$10.00 out·1M·98.3% up
  • Anthropic$2.00 in·$10.00 out·1M·98% up
  • Google Vertex AI$2.00 in·$10.00 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 30 Sep 2026.

Common questions

What is the difference between Claude 2 and Claude Sonnet 5.5?

Both are developed by Anthropic but target different use cases. Claude 2 has a 100K token context window vs Claude Sonnet 5.5's 1.0M. You can compare their actual outputs across 5 challenges on Rival to see how they differ in practice.

Which is better, Claude 2 or Claude Sonnet 5.5?

It depends on your use case. Claude 2 and Claude Sonnet 5.5 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 Claude Sonnet 5.5?

Claude 2 costs $11.02/M input tokens and Claude Sonnet 5.5 costs $2/M input tokens. Claude Sonnet 5.5 is $9.02/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 Claude Sonnet 5.5 on Rival?

This page shows a side-by-side comparison of Claude 2 and Claude Sonnet 5.5 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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Same lab, same size, long tail

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Model pages

  • Claude 25 outputs, specs and price
  • Claude Sonnet 5.558 outputs, specs and price
Workshop · 150 skills

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