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  5. Horizon AlphavsSolar Pro 4
Updated Aug 2026

Horizon AlphavsSolar Pro 4

Horizon Alpha is cheaper than Solar Pro 4 at $0/M vs $0.09/M input tokens.

Horizon Alpha and Solar Pro 4 compared across 2 shared prompts
SpecHorizon AlphaSolar Pro 4
Input priceFree$0.09/M tokens
Output priceFree$0.36/M tokens
Context window256K tokens524K tokens
Free API (OpenRouter)NoNo
ReleasedJul 2025Aug 2026
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…

Horizon Alpha207 words
Golden Maple Soy Glazed Chickpeas Ingredients (7 pantry staples) 1 can (15 oz) chickpeas, drained and rinsed 2 tbsp soy sauce 1 tbsp maple syrup (or honey) 1 tbsp olive oil 1 tsp garlic powder 1/2 tsp smoked paprika (or regular paprika) Pinch of red pepper flakes (optional) + salt to taste Instructions Dry the…
Read the full answer
Solar Pro 4294 words
🍝 Golden Umami Silk Noodles A savory-sweet pasta dish that transforms basic pantry staples into a glossy, flavorful meal. It's quick, comforting, and relies on the balance of soy, honey, and butter for a rich sauce without needing fresh produce.
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…

Horizon Alpha698 words
Here’s a simple, beginner-friendly 1‑month plan focused on diet, exercise, and sleep. It’s designed to be realistic, build consistency, and show quick wins. Overall approach Keep it simple: small daily actions beat perfection. Track 3 basics daily: steps, protein at meals, sleep duration.
Read the full answer
Solar Pro 4859 words
Here’s a simple, progressive 1-month plan built around Diet, Exercise, and Sleep. Each week adds one small, beginner-friendly shift to each area. The goal isn’t perfection; it’s building consistent, sustainable habits that compound over time.
Read the full answer
Our Verdict
Solar Pro 4
Solar Pro 4
Horizon Alpha
Horizon AlphaRunner-up

Not enough votes to call it. On the specs, Solar Pro 4 has the edge: newer, bigger context window.

Too close to call
API pricing

Cost per 1M tokens

Horizon Alpha
Input
$0.000
Output
$0.000
Solar Pro 4
Input
$0.09
Output
$0.36
Where to run it

1 host

Horizon Alpha

No hosts listed on OpenRouter.

Solar Pro 41 host
HostInOutContextUptime
UUpstage$0.09 in·$0.36 out·524k·99.7% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Horizon Alpha is developed by OpenRouter while Solar Pro 4 is developed by Upstage. Horizon Alpha has a 256K token context window vs Solar Pro 4's 524K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

It depends on your use case. Horizon Alpha and Solar Pro 4 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.

Horizon Alpha costs $0/M input tokens and Solar Pro 4 costs $0.09/M input tokens. Horizon Alpha is $0.09/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 Horizon Alpha and Solar Pro 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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Solar Pro 4 logo
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Rival
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