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  5. Claude Opus 5.5vsMistral Small Creative
Updated Sep 2026

Claude Opus 5.5vsMistral Small Creative

Mistral Small Creative is cheaper than Claude Opus 5.5 at $0.1/M vs $4/M input tokens.

Claude Opus 5.5 and Mistral Small Creative compared across 19 shared prompts
SpecClaude Opus 5.5Mistral Small Creative
Input price$4/M tokens$0.1/M tokens
Output price$20/M tokens$0.3/M tokens
Context window1.0M tokens33K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2026Dec 2025
Side by side

Same prompt, both answers

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

Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

Claude Opus 5.51,442 words
How Large Language Models Work: Three Explanations For the Experienced Software Engineer Think of an LLM as a single, very large pure function: f(tokens[0..n]) → probability distribution over tokens[n+1]. Text is chunked into tokens (roughly word fragments, from a vocabulary of about 100k).
Read the full answer
Mistral Small Creative1,154 words
For the Experienced Software Engineer (Distributed Systems/APIs Background) You’re used to building systems where correctness, latency, and fault tolerance are paramount—so the idea that "predicting the next word" could produce anything resembling intelligence likely sounds like a parlor trick.
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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…

Claude Opus 5.52,253 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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Mistral Small Creative1,644 words
Dish Concept: *"Ethereal Tundra" A Symphony of Arctic and Tropical Contrasts Michelin 3-Star Narrative: "Ethereal Tundra" is a deconstructed homage to the paradoxical beauty of the Arctic—where harsh, frozen landscapes hide delicate, vibrant life beneath the surface.
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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 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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Mistral Small Creative499 words
1. Year-by-Year Financial Projections (FY2026–FY2030) Key Inputs at Close (FY2025): Purchase Price: 12.0x EBITDA = $1.44B Total Debt: 5.5x EBITDA = $660M Term Loan: 4.0x EBITDA = $480M (9.0% cash interest, 1.0% amortization) Mezzanine: 1.5x EBITDA = $180M (12.0% cash interest + 2.0% PIK) Equity: $1.44B - $660M = $780M…
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Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Claude Opus 5.51,853 words
The Next 48 Hours: CEO Action Plan The Core Decision We disclose. The question is how to do it well, not whether. Before the schedule, here are the three facts that drive every decision below. 1. The harm is concrete.
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Mistral Small Creative1,696 words
This is a high-stakes ethical, legal, and operational crisis requiring immediate transparency, patient safety as the top priority, and a structured approach to mitigate harm while protecting the company’s long-term viability.
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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 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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Mistral Small Creative552 words
Cutting-Edge 3-Month Longevity Optimization Plan for Biohackers Objective: Maximize biological age reversal, cognitive performance, physical resilience, and metabolic flexibility through evidence-based biohacking, precision nutrition, advanced training, and neurological optimization.
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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 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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Mistral Small Creative1,182 words
INVESTMENT COMMITTEE MEMO LedgerLift (LLLT) – Long Recommendation 12-Month Price Target: $65–$85 Thesis: LedgerLift is a high-quality SaaS business with a defensible moat in mid-market spend management, driven by sticky retention (NRR 123%, churn 6%), scalable unit economics (CAC payback 18 months), and a clear path to…
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Our Verdict
Claude Opus 5.5
Claude Opus 5.5
Mistral Small Creative
Mistral Small CreativeRunner-up

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

Mistral Small Creative costs 67x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Opus 5.5
Input
$4.00
Output
$20.00
Mistral Small Creative
Input
$0.10
40× cheaper
Output
$0.30
67× cheaper

Mistral Small Creative is cheaper on both: 40× input, 67× 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
Mistral Small Creative

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 Mistral Small Creative is developed by Mistral AI. Claude Opus 5.5 has a 1.0M token context window vs Mistral Small Creative's 33K. 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 Opus 5.5 and Mistral Small Creative 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 Opus 5.5 costs $4/M input tokens and Mistral Small Creative costs $0.1/M input tokens. Mistral Small Creative is $3.90/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 Mistral Small Creative 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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