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
  • 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. Claude Sonnet 4.5vsGLM 5.3 FlashX
Updated Sep 2026

Claude Sonnet 4.5vsGLM 5.3 FlashX

GLM 5.3 FlashX is cheaper than Claude Sonnet 4.5 at $0.37/M vs $3/M input tokens.

Claude Sonnet 4.5 and GLM 5.3 FlashX compared across 3 shared prompts
SpecClaude Sonnet 4.5GLM 5.3 FlashX
Input price$3/M tokens$0.37/M tokens
Output price$15/M tokens$1.25/M tokens
Context window200K tokens1.0M tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedSep 2025Sep 2026
Side by side

Same prompt, both answers

Opening lines from 2 of the 3 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…

Claude Sonnet 4.5165 words
Golden Pantry Frittata Ingredients: 6 eggs 1 cup shredded cheese (cheddar or mozzarella) 1 onion, diced 2 cloves garlic, minced 2 tablespoons olive oil Salt and pepper to taste 1/2 teaspoon dried herbs (oregano, basil, or Italian seasoning) Instructions: Preheat your oven to 375°F (190°C).
Read the full answer
GLM 5.3 FlashX172 words
Golden Honey Garlic Chickpea Crunch A crispy, sweet-savory skillet dish that works as a snack, side, or topping for rice. Ingredients (7): 1 can chickpeas (drained, patted dry) 3 tbsp honey 3 tbsp soy sauce 3 cloves garlic (minced) 2 tbsp olive oil ½ tsp red pepper flakes 2 tbsp sesame seeds (or crushed peanuts) Prep…
Read the full answer

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 Sonnet 4.5831 words
For the Software Engineer Think of it like building a massive distributed key-value store, except instead of exact lookups, you're doing fuzzy pattern matching across billions of parameters.
Read the full answer
GLM 5.3 FlashX1,267 words
The Skeptical Software Engineer Yes, at inference time an LLM really is just "predict the next token, repeat" — a deterministic function (plus sampling noise) that maps a sequence of tokens to a probability distribution.
Read the full answer
Our Verdict
GLM 5.3 FlashX
GLM 5.3 FlashX
Claude Sonnet 4.5
Claude Sonnet 4.5Runner-up

Not enough votes to call it. On the specs, GLM 5.3 FlashX has the edge: newer, bigger context window.

GLM 5.3 FlashX costs 12x less per token.

Too close to call
API pricing

Cost per 1M tokens

Claude Sonnet 4.5
Input
$3.00
Output
$15.00
GLM 5.3 FlashX
Input
$0.37
8.1× cheaper
Output
$1.25
12× cheaper

GLM 5.3 FlashX is cheaper on both: 8.1× input, 12× output.

Where to run it

5 hosts

Claude Sonnet 4.54 hosts
HostInOutContextUptime
Amazon Bedrock$3.00 in·$15.00 out·1M·99.9% upAzure AI Foundry$3.00 in·$15.00 out·200k·97.5% upAnthropic$3.00 in·$15.00 out·1M·100% upGoogle Vertex AI$3.00 in·$15.00 out·1M·99.9% up
GLM 5.3 FlashX1 host
HostInOutContextUptime
Z.aifp8$0.37 in·$1.25 out·1M·100% up

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

Research

What we learned reading every model

FAQ

Common questions

Claude Sonnet 4.5 is developed by Anthropic while GLM 5.3 FlashX is developed by Zhipu AI. Claude Sonnet 4.5 has a 200K token context window vs GLM 5.3 FlashX's 1.0M. You can compare their actual outputs across 3 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Sonnet 4.5 and GLM 5.3 FlashX each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 3 challenges so you can judge which fits your needs best.

Claude Sonnet 4.5 costs $3/M input tokens and GLM 5.3 FlashX costs $0.37/M input tokens. GLM 5.3 FlashX is $2.63/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 Sonnet 4.5 and GLM 5.3 FlashX 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

Claude Sonnet 4.5 logoDeepSeek V4 Flash Vision Exp logo
Claude Sonnet 4.5 vs DeepSeek V4 Flash Vision ExpLanded Sep 2026
GLM 5.3 FlashX logoSolar Pro 4 logo
GLM 5.3 FlashX vs Solar Pro 4Landed Sep 2026
Claude Sonnet 4.5 logoHy3 logo
Claude Sonnet 4.5 vs Hy3Landed Sep 2026
GLM 5.3 FlashX logoQwen3.7 Flash logo
GLM 5.3 FlashX vs Qwen3.7 FlashLanded Sep 2026
Claude Sonnet 4.5 logoLing 3.0 Flash logo
Claude Sonnet 4.5 vs Ling 3.0 FlashLanded Sep 2026
GLM 5.3 FlashX logoMuse Glimmer 30B logo
GLM 5.3 FlashX vs Muse Glimmer 30BLanded Sep 2026
Claude Sonnet 4.5 logoGLM 5.3 logo
Claude Sonnet 4.5 vs GLM 5.3Landed Sep 2026
GLM 5.3 FlashX logoTernary Bonsai 2 27B logo
GLM 5.3 FlashX vs Ternary Bonsai 2 27BLanded Sep 2026

Same lab, same size, long tail

Claude Sonnet 4.5 logoClaude Opus 4.6 logo
Claude Sonnet 4.5 vs Claude Opus 4.6Same lab
Claude Sonnet 4.5 logoClaude Fable 5.1 logo
Claude Sonnet 4.5 vs Claude Fable 5.1Same lab
GLM 5.3 FlashX logoGLM 5.3 logo
GLM 5.3 FlashX vs GLM 5.3Same lab
GLM 5.3 FlashX logoGLM 5.3 Flash logo
GLM 5.3 FlashX vs GLM 5.3 FlashSame lab
GLM 5.3 FlashX logoDeepSeek V4 Flash logo
GLM 5.3 FlashX vs DeepSeek V4 FlashSame size
GLM 5.3 FlashX logoDeepSeek V4 Flash 0731 logo
GLM 5.3 FlashX vs DeepSeek V4 Flash 0731Same size
GLM 5.3 FlashX logoDeepSeek V4 Pro logo
GLM 5.3 FlashX vs DeepSeek V4 ProNew provider
GLM 5.3 FlashX logoDeepSeek V4 Pro 0813 logo
GLM 5.3 FlashX vs DeepSeek V4 Pro 0813New provider

Model pages

Claude Sonnet 4.5 logo
Claude Sonnet 4.543 outputs, specs and price
GLM 5.3 FlashX logo
GLM 5.3 FlashX3 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
  • 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