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  5. Claude Opus 5.5vsSonoma Dusk Alpha
Updated Sep 2026

Claude Opus 5.5vsSonoma Dusk Alpha

Sonoma Dusk Alpha is cheaper than Claude Opus 5.5 at $0/M vs $4/M input tokens.

Claude Opus 5.5 and Sonoma Dusk Alpha compared across 2 shared prompts
SpecClaude Opus 5.5Sonoma Dusk Alpha
Input price$4/M tokensFree
Output price$20/M tokensFree
Context window1.0M tokens2.0M tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Sep 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
Sonoma Dusk Alpha193 words
Pantry Power Pasta Primavera This savory one-pan pasta dish transforms basic pantry staples into a creamy, garlicky delight with a hint of freshness from canned tomatoes. It's quick, comforting, and perfect for a weeknight meal. Serves 2-4.
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
Sonoma Dusk Alpha713 words
1-Month Plan for Better Health and Longevity This plan is designed for beginners, emphasizing gradual changes to build sustainable habits. We'll focus on three key areas: diet, exercise, and sleep. Each area includes weekly goals to make progress feel achievable. Track your efforts in a simple journal or app.
Read the full answer
Our Verdict
Claude Opus 5.5
Claude Opus 5.5
Sonoma Dusk Alpha
Sonoma Dusk Alpha

Not enough votes to call it. On the specs, nothing separates them.

Too close to call
API pricing

Cost per 1M tokens

Claude Opus 5.5
Input
$4.00
Output
$20.00
Sonoma Dusk Alpha
Input
$0.000
Output
$0.000
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
Sonoma Dusk Alpha

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 Sonoma Dusk Alpha is developed by OpenRouter. Claude Opus 5.5 has a 1.0M token context window vs Sonoma Dusk Alpha's 2.0M. 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 Sonoma Dusk Alpha 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.

Claude Opus 5.5 costs $4/M input tokens and Sonoma Dusk Alpha costs $0/M input tokens. Sonoma Dusk Alpha is $4.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude Opus 5.5 and Sonoma Dusk Alpha 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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