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  1. Home
  2. Models
  3. Claude Opus 5.5
Updated Sep 25, 2026
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Openings

How Claude Opus 5.5 starts an answer

The first lines of 5 of its 12 written answers. 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…

4,420 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.
Read the full answer

Historical Counterfactual Analysis

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

3,435 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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Advanced Longevity Plan (Biohacker)

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

3,099 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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Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

2,280 words
Architecture Review: Real-Time Collaborative Editor The most serious problems cluster in three areas: the sync model (client-clock LWW), cross-server propagation (per-server WebSockets with DB polling), and the CDN/auth layer, which can leak data between users. Issues are grouped by area below.
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Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

2,253 words
"Hive & Tide" Langoustine, Beeswax, White Chocolate & Oscietra Caviar, Hay-Baked Celeriac, Fermented Green Strawberry, Sea Buckthorn I. The Concept Most coastal menus celebrate the meeting of sea and land. This dish is about a stranger, quieter meeting: the meadow and the seabed, the bee and the langoustine.
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Compare Claude Opus 5.5

Claude Opus 5.5 vs Ox Alpha19 shared prompts · Landed Aug 2026
Claude Opus 5.5 vs MiniMax M319 shared prompts · Landed Jun 2026
Claude Opus 5.5 vs Qwen3.8 Max Prime19 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs GPT-6 Luna Pro19 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs GPT-6 Sol Pro19 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs GPT-6 Luna19 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs Mercury 2.519 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs Ling 3.0 Flash Fin (free)19 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs Muse Spark 1.319 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs Gemini 3.8 Flash19 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs Muse Spark 1.3 Contributor19 shared prompts · Landed Sep 2026
Claude Opus 5.5 vs Grok 4.619 shared prompts · Landed Aug 2026

Prompts Claude Opus 5.5 answered

  • Mini LBO Underwritefinancial modeling
  • Advanced Longevity Plan (Biohacker)reasoning
  • Beginner's Longevity Planreasoning
  • Explain Like I'm a Specific Expertreasoning
  • Startup Pitch Teardownreasoning
  • Retro macOS UI Recreationweb design

Alternatives to Claude Opus 5.5

Claude Opus 5.5's competitors have been quietly putting in work.

Solar Mini 4 logo
Solar Mini 4upstage
GLM 5.3 Prime logo
GLM 5.3 Primez-ai
Qwen3.8 Max Prime logo
Qwen3.8 Max Primeqwen
GPT-6 Sol logo
GPT-6 Solopenai
Command A+ logo
Command A+cohere
MiMo-V2.6-Flash logo
MiMo-V2.6-Flashxiaomi
Grok 4.7 logo
Grok 4.7xai
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Claude Opus 5.5

Claude Opus 5.5

Anthropic's successor to Opus 5 for reasoning, coding, and extended agent workflows. Accepts text, images, and documents in a one-million-token context, with adaptive thinking controlled by reasoning effort.

Ranks#5Business Strategy#5Recipes & Cooking#5Summarization#5Travel Planning#6Practical Tasks#7Health & Longevity
OpenRouterDocs
Provider
Anthropic
Released
2026-09-22
Size
LARGE
Free API (OpenRouter)
No
Per 1M tokens
$4 in · $20 out
Rival’s tab
$2.31
19/19 receipts survived

Free API availability

No free endpoint for Claude Opus 5.5 was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 25 Sep 2026 · OpenRouter usage limits

View API options↗
Get API accessProvider and language code samples
4 hostsInOutContextUptime
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.

Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"anthropic/claude-opus-5.5"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

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14 outputs · $2.30 tracked across 14 receipts

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Claude Opus 5.5 vs Ox Alpha

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Best AI for Creative Writing

A stand-up set with puns banned, a manifesto against CAPTCHA, an interview wi...