GPT-5.4 Pro vs 
Horizon Alpha
Horizon Alpha is cheaper than GPT-5.4 Pro at $0/M vs $30/M input tokens.
Written rounds
2 promptsOne month, three habits, someone starting from nothing.
GPT-5.4 Pro: Here’s a simple, beginner-friendly 1-month health and longevity plan built around 3 key areas: Nutrition Movement Recovery (sleep + stress) The goal is consistency, not perfection. Start small and make the habits easy enough to keep.
Horizon Alpha: 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.
Seven pantry ingredients, one dish, and a name worth saying out loud.
GPT-5.4 Pro: Dragon Pantry Peanut Noodles A fast, sweet-savory noodle dish made from 7 pantry staples. Ingredients 8 oz spaghetti 1/3 cup peanut butter 3 tbsp soy sauce 1 tbsp honey 1 tbsp vegetable oil 1 tsp garlic powder 1/4 tsp red pepper flakes Water for boiling/thinning the sauce doesn’t count.
Horizon Alpha: 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…
Price and specs
Not enough votes to call it. On the specs, GPT-5.4 Pro has the edge: bigger model tier, newer, bigger context window, major provider backing.
| Spec | GPT-5.4 Pro | Horizon Alpha |
|---|---|---|
| Input price | $30/M tokens | Free |
| Output price | $180/M tokens | Free |
| Context window | 1.1M tokens | 256K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Mar 2026 | Jul 2025 |
| At 10M a month | $300 | $0 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Horizon Alpha
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between GPT-5.4 Pro and Horizon Alpha?
GPT-5.4 Pro is developed by OpenAI while Horizon Alpha is developed by OpenRouter. GPT-5.4 Pro has a 1.1M token context window vs Horizon Alpha's 256K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.
Which is better, GPT-5.4 Pro or Horizon Alpha?
It depends on your use case. GPT-5.4 Pro and Horizon Alpha 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.
How much does GPT-5.4 Pro cost compared to Horizon Alpha?
GPT-5.4 Pro costs $30/M input tokens and Horizon Alpha costs $0/M input tokens. Horizon Alpha is $30.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.
How can I compare GPT-5.4 Pro and Horizon Alpha on Rival?
This page shows a side-by-side comparison of GPT-5.4 Pro and Horizon Alpha 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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