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  5. Claude Sonnet 3.6 (2022-10-22)vsClaude Opus 5.5
Updated Sep 2026

Claude Sonnet 3.6 (2022-10-22)vsClaude Opus 5.5

Claude Sonnet 3.6 (2022-10-22) is cheaper than Claude Opus 5.5 at $3/M vs $4/M input tokens.

Claude Sonnet 3.6 (2022-10-22) and Claude Opus 5.5 compared across 19 shared prompts
SpecClaude Sonnet 3.6 (2022-10-22)Claude Opus 5.5
Input price$3/M tokens$4/M tokens
Output price$15/M tokens$20/M tokens
Context window200K tokens1.0M tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedJun 2024Sep 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 19 prompts both answered. Formatting stripped, words untouched.

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

Claude Sonnet 3.6 (2022-10-22)434 words
Here's an analysis of problematic clauses and suggested modifications: SCOPE Problem: Allows unlimited scope changes without compensation Modification: "Material changes to scope shall be documented in writing and may require additional compensation as mutually agreed upon by both parties."
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Claude Opus 5.54,420 words
Contractor-Side Review of the Software Consulting Agreement Overall assessment: This agreement is heavily one-sided. Nearly every clause shifts risk, cost, or control to the Contractor, and several provisions interact to create compounding exposure.
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Mini LBO Underwrite

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) –…

Claude Sonnet 3.6 (2022-10-22)188 words
I'll help you analyze this LBO opportunity step by step. First, let's calculate key metrics year by year: Entry Values (FY2025): EV = $120m × 12.0x = $1,440m Transaction fees = $28.8m (2% of EV) Total debt = $660m (5.5x EBITDA) Term Loan = $480m (4.0x) Mezzanine = $180m (1.5x) Equity = $808.8m ($1,440m + $28.8m…
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Claude Opus 5.5900 words
HarborTech Services: 5-Year LBO Underwriting Conventions: $m. Interest is charged on beginning-of-year balances, which avoids circularity. Term Loan (TL) amortization is 1% of the original $480m, or $4.8m per year. Mezz PIK accrues to principal. All FCF after mandatory debt service sweeps to the TL.
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Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

Claude Sonnet 3.6 (2022-10-22)213 words
Here's my analysis of how an earlier transistor invention could have reshaped the 20th century: 1920s-1930s: Initial transistor development would likely be led by major industrial labs (Western Electric, GE, Siemens) Radio and telephone systems would begin transistorizing by late 1920s Early computers emerge in…
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Claude Opus 5.53,435 words
The Transistor in 1920: A Counterfactual Through 1980 First, a Reality Check on the Premise A transistor "invented" in 1920 would not have changed the world in 1920. The actual 1947 transistor rested on three foundations that did not exist yet: Quantum theory of solids.
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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 Sonnet 3.6 (2022-10-22)142 words
Crunchy Cinnamon Cloud Cookies Total time: 25 minutes Prep time: 10 minutes Bake time: 15 minutes Ingredients: 2 egg whites 1/2 cup granulated sugar 1/4 teaspoon ground cinnamon 1/4 teaspoon vanilla extract Pinch of salt 1/2 cup all-purpose flour 1/4 cup butter, melted Instructions: Preheat oven to 325°F (165°C).
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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…
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Advanced Investment Memo (IC Memo)

You are writing an internal investment committee memo for a long/short equity fund. Company (fictional): LedgerLift (ticker: LLLT) – B2B…

Claude Sonnet 3.6 (2022-10-22)512 words
INVESTMENT COMMITTEE MEMO: LedgerLift (LLLT) RECOMMENDATION: LONG PT Range: $52-78 Risk/Reward: +70%/-25% Thesis: LedgerLift represents a compelling long opportunity in the B2B spend management space, combining best-in-class unit economics (123% NRR, 18-month CAC payback) with significant operating leverage potential…
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Claude Opus 5.51,335 words
IC Memo: LedgerLift (LLLT): Short, Starter Size, Hedged vs. Peer Basket Fictional exercise. Not investment advice. Recommendation Short (starter size, 1–1.5% gross), paired against a long basket of Peers A, B and C. 12-month price target range: $36–42 (current price $46, implying 9–22% downside). Thesis.
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Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Claude Sonnet 3.6 (2022-10-22)471 words
Here's a comprehensive 3-month longevity optimization plan: MONTH-BY-MONTH BREAKDOWN Month 1: Foundation Building Focus: Establishing baseline metrics and core habits Key areas: Diet adaptation, basic supplementation, exercise introduction Month 2: Protocol Intensification Focus: Optimizing interventions and increasing…
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Claude Opus 5.53,099 words
The 90-Day Longevity & Performance Protocol A structured, measurable plan for the experienced biohacker How to Use This Plan Philosophy: Measure → Intervene → Re-measure. Every intervention has a hypothesis, a metric, and a decision rule.
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Our Verdict
Claude Opus 5.5
Claude Opus 5.5
Claude Sonnet 3.6 (2022-10-22)
Claude Sonnet 3.6 (2022-10-22)Runner-up

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

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Sonnet 3.6 (2022-10-22)
Input
$3.00
1.3× cheaper
Output
$15.00
1.3× cheaper
Claude Opus 5.5
Input
$4.00
Output
$20.00

Claude Sonnet 3.6 (2022-10-22) is cheaper on both: 1.3× input, 1.3× output.

Where to run it

4 hosts

Claude Sonnet 3.6 (2022-10-22)

No hosts listed on OpenRouter.

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

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

Research

What we learned reading every model

FAQ

Common questions

Both are developed by Anthropic but target different use cases. Claude Sonnet 3.6 (2022-10-22) has a 200K token context window vs Claude Opus 5.5's 1.0M. You can compare their actual outputs across 19 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Sonnet 3.6 (2022-10-22) and Claude Opus 5.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 19 challenges so you can judge which fits your needs best.

Claude Sonnet 3.6 (2022-10-22) costs $3/M input tokens and Claude Opus 5.5 costs $4/M input tokens. Claude Sonnet 3.6 (2022-10-22) is $1.00/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 Sonnet 3.6 (2022-10-22) and Claude Opus 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

Claude Sonnet 3.6 (2022-10-22) logoClaude Opus 4.6 logo
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Claude Sonnet 3.6 (2022-10-22) logoGrok 4.6 logo
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Model pages

Claude Sonnet 3.6 (2022-10-22) logo
Claude Sonnet 3.6 (2022-10-22)59 outputs, specs and price
Claude Opus 5.5 logo
Claude Opus 5.519 outputs, specs and price
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