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  5. MiniMax M2.1vsSolar Mini 4
Updated Sep 2026

MiniMax M2.1vsSolar Mini 4

Solar Mini 4 is the newer model, released after MiniMax M2.1.

MiniMax M2.1 and Solar Mini 4 compared across 19 shared prompts
SpecMiniMax M2.1Solar Mini 4
Input price—$0.05/M tokens
Output price—$0.2/M tokens
Context window—524K tokens
WeightsOpen—
Free API (OpenRouter)NoNo
ReleasedDec 2025Sep 2026
Side by side

Same prompt, both answers

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

Historical Counterfactual Analysis

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

MiniMax M2.15,764 words
The Transistor in 1920: A Counterfactual History of the Twentieth Century Introduction: The Single Most consequential Alternative The invention of the transistor at Bell Laboratories on December 23, 1947, stands as one of the most important technological breakthroughs in human history.
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Solar Mini 41,539 words
This is a fascinating counterfactual. I need to note upfront that the scientific and engineering foundations for a working transistor did not exist in 1920. Quantum mechanics was barely a decade old, band theory of solids hadn't been developed, and semiconductor physics (doping, p-n junctions, electron mobility) was…
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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…

MiniMax M2.15,342 words
Critical Analysis: Real-Time Collaborative Document Editor Architecture Executive Summary This architecture presents several significant design concerns that would likely result in data loss, inconsistent user experiences, and scaling limitations in production environments.
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Solar Mini 41,165 words
Here’s a systematic breakdown of the architectural weaknesses, failure modes, and scaling bottlenecks in your design, along with specific solutions and their trade-offs. Real-Time Synchronization & WebSocket Affinity Issue: Round-robin load balancing is stateless, but WebSockets are stateful and long-lived.
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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) –…

MiniMax M2.11,052 words
HarborTech Services (HTS) – 5-Year LBO Investment Memorandum Executive Summary This underwriting analysis evaluates a buyout of HarborTech Services, a mission-critical HVAC maintenance and monitoring provider to data centers.
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Solar Mini 41,718 words
518.51935 New TL: 276.34682 - 86.82747 = 189.51935 Mezz: PIK 194.8377888 * 0.02 = 3.896755776 New Mezz: 194.8377888 + 3.896755776 = 198.734544576 Ending Balances: TL: 189.52 Mezz: 198.73 Total Debt: 388.25 Exit (End of FY2030): Exit EBITDA: 206.6252668 Exit Multiple: 10.5x Exit EV: 206.6252668 * 10.5 = 2,169.5653014…
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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…

MiniMax M2.14,782 words
Terra & Tides: A Dish of Contrasts Conceptual Narrative The sea has long been divided in culinary tradition—the briny cold waters of the North Atlantic and the crystalline depths of the Pacific each producing ingredients that speak their own languages.
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Solar Mini 41,364 words
Chronos & Tides A Three-Component Study in Preservation, Precision, and Ephemeral Sensation Concept: A single plate that traces the lifecycle of an umami-rich flavor profile through three distinct temporal states: fermented (time in), precision-cooked (time controlled), and volatile (time suspended).
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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…

MiniMax M2.15,719 words
The Bioptimization Blueprint: A 90-Day Longevity Protocol Executive Overview This comprehensive 90-day protocol represents the convergence of cutting-edge longevity science, ancestral health principles, and advanced biohacking methodologies.
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Solar Mini 41,388 words
🧬 3-Month Biohacker Longevity & Performance Optimization Plan ⚠️ Important Disclaimer: This protocol is for informational and educational purposes. It is not medical advice. Always consult a licensed healthcare provider before starting new supplements, fasting regimens, intense exercise, or neurofeedback protocols.
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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…

MiniMax M2.11,369 words
Investment Committee Memo: LedgerLift (LLLT) Date: Internal Review Coverage: Initiating Recommendation: LONG Recommendation Position: Long 12-Month Price Target Range: $42–$76 Current Price: $46 LedgerLift offers a compelling risk/reward at current levels, trading at 8.9x FY2025 revenue with a clear path to 15%+…
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Solar Mini 4347 words
Investment Committee Memo: LedgerLift (LLLT) To: Investment Committee From: Research Date: October 26, 2023 Subject: Long/Short Recommendation: LedgerLift (LLLT) Recommendation Action: Long 12-Month PT Range: $55 – $65 Thesis: LedgerLift demonstrates best-in-class SaaS metrics (123% NRR, 94% gross retention) within a…
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Our Verdict
MiniMax M2.1
MiniMax M2.1
Solar Mini 4
Solar Mini 4

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

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

MiniMax M2.1
Input
—
Output
—
Solar Mini 4
Input
$0.05
Output
$0.20
Where to run it

3 hosts

MiniMax M2.12 hosts
HostInOutContextUptime
MiniMaxfp8$0.30 in·$1.20 out·205k·99.8% upNNovitafp8$0.30 in·$1.20 out·205k·99.4% up
Solar Mini 41 host
HostInOutContextUptime
UUpstage$0.05 in·$0.20 out·524k·100% up

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

Research

What we learned reading every model

FAQ

Common questions

MiniMax M2.1 is developed by MiniMax while Solar Mini 4 is developed by Upstage. You can compare their actual outputs across 19 challenges on Rival to see how they differ in practice.

It depends on your use case. MiniMax M2.1 and Solar Mini 4 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.

This page shows a side-by-side comparison of MiniMax M2.1 and Solar Mini 4 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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