GLM 5.3 Prime vs 
GPT-6 Astra Pro
GLM 5.3 Prime is cheaper than GPT-6 Astra Pro at $2.8/M vs $10/M input tokens.
Mini Rhythm Game Snippet
Rhythm game in a browser tab. The theme is the model's problem.
Loading the build
Loading the build
Which answer wins?
Price and specs
Not enough votes to call it. On the specs, GPT-6 Astra Pro has the edge: bigger model tier, major provider backing. GLM 5.3 Prime costs 5.7x less per token.
| Spec | GLM 5.3 Prime | GPT-6 Astra Pro |
|---|---|---|
| Input price | $2.8/M tokens | $10/M tokens |
| Output price | $8.8/M tokens | $50/M tokens |
| Context window | 1.0M tokens | 1.1M tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Sep 2026 |
| At 10M a month | $28.00 | $100 |
Input tokens at list price. No caching, no batch discount.
Where to run it
GLM 5.3 Prime1 host
GPT-6 Astra Pro2 hosts
Per million tokens. Prices and uptime via OpenRouter, checked 29 Sep 2026.
Common questions
What is the difference between GLM 5.3 Prime and GPT-6 Astra Pro?
GLM 5.3 Prime is developed by Z.ai while GPT-6 Astra Pro is developed by OpenAI. GLM 5.3 Prime has a 1.0M token context window vs GPT-6 Astra Pro's 1.1M. You can compare their actual outputs across 3 challenges on Rival to see how they differ in practice.
Which is better, GLM 5.3 Prime or GPT-6 Astra Pro?
It depends on your use case. GLM 5.3 Prime and GPT-6 Astra Pro 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.
How much does GLM 5.3 Prime cost compared to GPT-6 Astra Pro?
GLM 5.3 Prime costs $2.8/M input tokens and GPT-6 Astra Pro costs $10/M input tokens. GLM 5.3 Prime is $7.20/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 GLM 5.3 Prime and GPT-6 Astra Pro on Rival?
This page shows a side-by-side comparison of GLM 5.3 Prime and GPT-6 Astra Pro 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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