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  5. Claude Sonnet 4vsGLM 5.3 FlashX
Updated Sep 2026

Claude Sonnet 4vsGLM 5.3 FlashX

GLM 5.3 FlashX is cheaper than Claude Sonnet 4 at $0.37/M vs $3/M input tokens.

Claude Sonnet 4 and GLM 5.3 FlashX compared across 3 shared prompts
SpecClaude Sonnet 4GLM 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
ReleasedMay 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 4132 words
Midnight Mug Magic 🌙 A warm, gooey chocolate mug cake that's ready faster than you can say "dessert emergency!" Ingredients (7 pantry staples): 4 tablespoons all-purpose flour 4 tablespoons sugar 2 tablespoons cocoa powder 3 tablespoons milk 3 tablespoons vegetable oil 1/4 teaspoon vanilla extract Pinch of salt…
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 4513 words
For the Software Engineer Think of it like this: you're building a massively parallel system that processes tokens (words/subwords) through a pipeline of transformer blocks, each containing attention mechanisms and feed-forward networks.
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
Claude Sonnet 4Runner-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
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

2 hosts

Claude Sonnet 41 host
HostInOutContextUptime
Amazon Bedrock$3.00 in·$15.00 out·200k·100% 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 is developed by Anthropic while GLM 5.3 FlashX is developed by Zhipu AI. Claude Sonnet 4 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 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 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 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

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Same lab, same size, long tail

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Model pages

Claude Sonnet 4 logo
Claude Sonnet 459 outputs, specs and price
GLM 5.3 FlashX logo
GLM 5.3 FlashX3 outputs, specs and price
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