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  5. Claude Opus 5.5vsCypher Alpha (free)
Updated Sep 2026

Claude Opus 5.5vsCypher Alpha (free)

Claude Opus 5.5 is the newer model, released after Cypher Alpha (free).

Claude Opus 5.5 and Cypher Alpha (free) compared across 2 shared prompts
SpecClaude Opus 5.5Cypher Alpha (free)
Input price$4/M tokens—
Output price$20/M tokens—
Context window1.0M tokens—
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Jul 2025
Side by side

Same prompt, both answers

Opening lines from every prompt both answered. Formatting stripped, words untouched.

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

Claude Opus 5.5300 words
Midnight Silk Noodles Creamy, tangy peanut noodles with a gentle kick, ready faster than takeout. Serves: 2 Prep time: 5 minutes Cook time: 10 minutes Total time: 15 minutes The 7 Ingredients 8 oz (225 g) spaghetti (or any long noodle) ¼ cup creamy peanut butter 3 tablespoons soy sauce 1 tablespoon honey (or sugar) 1…
Read the full answer
Cypher Alpha (free)155 words
Cheesy Herb Pasta in a Flash Ingredients: Spaghetti or any type of pasta Tomato paste Olive oil Garlic powder Dried oregano Shredded mozzarella cheese Salt and pepper to taste Instructions: Cook pasta according to package instructions. Drain and set aside.
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

Claude Opus 5.5653 words
Your 1-Month Starter Plan for Better Health & Longevity The philosophy: Small, consistent changes beat dramatic overhauls. Each week builds on the last, so by Day 30 you'll have a foundation of habits instead of a burned-out resolution.
Read the full answer
Cypher Alpha (free)245 words
1-Month Health & Longevity Jumpstart Plan Week 1-2: Nutrition Aim for 5-7 servings of fruits and vegetables daily. Start by adding a piece of fruit to breakfast and a salad at lunch. Swap refined grains for whole grains (e.g., brown rice, whole wheat bread). Try one new whole grain dish per week.
Read the full answer
Our Verdict
Claude Opus 5.5
Claude Opus 5.5
Cypher Alpha (free)
Cypher Alpha (free)Runner-up

Not enough votes to call it. On the specs, Claude Opus 5.5 has the edge: newer, bigger context window, major provider backing.

Too close to call
API pricing

Cost per 1M tokens

Claude Opus 5.5
Input
$4.00
Output
$20.00
Cypher Alpha (free)
Input
—
Output
—
Where to run it

4 hosts

Claude Opus 5.54 hosts
HostInOutContextUptime
Amazon Bedrock$4.00 in·$20.00 out·1M·99.8% upAzure AI Foundry$4.00 in·$20.00 out·1M·100% upAnthropic$4.00 in·$20.00 out·1M·100% upGoogle Vertex AI$4.00 in·$20.00 out·1M·100% up
Cypher Alpha (free)

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Claude Opus 5.5 is developed by Anthropic while Cypher Alpha (free) is developed by OpenRouter. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Opus 5.5 and Cypher Alpha (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

This page shows a side-by-side comparison of Claude Opus 5.5 and Cypher Alpha (free) 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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Model pages

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