Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. GPT-5 CodexvsSolar Pro 4
Updated Aug 2026

GPT-5 CodexvsSolar Pro 4

Solar Pro 4 is the newer model, released after GPT-5 Codex.

GPT-5 Codex and Solar Pro 4 compared across 13 shared prompts
SpecGPT-5 CodexSolar Pro 4
Input price—$0.09/M tokens
Output price—$0.36/M tokens
Context window—524K tokens
Free API (OpenRouter)NoNo
ReleasedSep 2025Aug 2026
Side by side

Same prompt, both answers

Opening lines from 2 of the 13 prompts 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…

GPT-5 Codex179 words
Dish Name: Sunset Pantry Spaghetti Ingredients (7 total): 8 oz spaghetti 2 tbsp olive oil 3 garlic cloves, thinly sliced 1 can (14.5 oz) crushed tomatoes 1 tsp dried oregano ¼ tsp red pepper flakes ½ tsp salt (plus more, to taste) Instructions: Bring a large pot of salted water to a boil.
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…

GPT-5 Codex569 words
1-Month Jumpstart to Better Health & Longevity This plan is designed for beginners and emphasizes steady, sustainable progress. It focuses on three key areas: diet, movement, and sleep & stress. Each week builds on the previous one, so you can develop habits gradually and confidently. 🥗 1.
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
GPT-5 Codex
GPT-5 Codex
Solar Pro 4
Solar Pro 4Runner-up

Not enough votes to call it. On the specs, GPT-5 Codex has the edge: bigger model tier, major provider backing.

Too close to call
API pricing

Cost per 1M tokens

GPT-5 Codex
Input
—
Output
—
Solar Pro 4
Input
$0.09
Output
$0.36
Where to run it

1 host

GPT-5 Codex

No hosts listed on OpenRouter.

Solar Pro 41 host
HostInOutContextUptime
UUpstage$0.09 in·$0.36 out·524k·99.8% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GPT-5 Codex is developed by OpenAI while Solar Pro 4 is developed by Upstage. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5 Codex and Solar Pro 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

This page shows a side-by-side comparison of GPT-5 Codex 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.

Keep exploring

More comparisons

Against the newest arrivals

GPT-5 Codex logoDeepSeek V4 Flash Vision Exp logo
GPT-5 Codex vs DeepSeek V4 Flash Vision ExpLanded Sep 2026
Solar Pro 4 logoHy3 logo
Solar Pro 4 vs Hy3Landed Sep 2026
GPT-5 Codex logoQwen3.7 Flash logo
GPT-5 Codex vs Qwen3.7 FlashLanded Sep 2026
Solar Pro 4 logoLing 3.0 Flash logo
Solar Pro 4 vs Ling 3.0 FlashLanded Sep 2026
GPT-5 Codex logoMuse Glimmer 30B logo
GPT-5 Codex vs Muse Glimmer 30BLanded Sep 2026
Solar Pro 4 logoGLM 5.3 logo
Solar Pro 4 vs GLM 5.3Landed Sep 2026
GPT-5 Codex logoTernary Bonsai 2 27B logo
GPT-5 Codex vs Ternary Bonsai 2 27BLanded Sep 2026
Solar Pro 4 logoGLM 5.3 Flash logo
Solar Pro 4 vs GLM 5.3 FlashLanded Sep 2026

Same lab, same size, long tail

GPT-5 Codex logoGPT-6 Astra Pro logo
GPT-5 Codex vs GPT-6 Astra ProSame lab
GPT-5 Codex logoGPT-6 Astra logo
GPT-5 Codex vs GPT-6 AstraSame lab
Solar Pro 4 logoSolar Pro 3 logo
Solar Pro 4 vs Solar Pro 3Same lab
Solar Pro 4 logoOx Alpha logo
Solar Pro 4 vs Ox AlphaSame size
Solar Pro 4 logoOwl Alpha logo
Solar Pro 4 vs Owl AlphaSame size
Solar Pro 4 logoPolaris Alpha logo
Solar Pro 4 vs Polaris AlphaSame size
Solar Pro 4 logoPony Alpha logo
Solar Pro 4 vs Pony AlphaSame size
Solar Pro 4 logoQwen Plus 0728 logo
Solar Pro 4 vs Qwen Plus 0728Same size

Model pages

GPT-5 Codex logo
GPT-5 Codex50 outputs, specs and price
Solar Pro 4 logo
Solar Pro 414 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed