Model comparison

GPT-6 Astra vs GLM 5.3

Compare pricing, context windows and capabilities from OpenRouter. Open either model’s page to check availability and try it online.

openaiGPT-6 Astranewopenai/gpt-6-astraz-aiGLM 5.3newz-ai/glm-5.3

Measured intelligence and task cost

Two current intelligence leaders from different providers. Artificial Analysis index v4.3, updated 2026-09-21.

GPT-6 Astra (max): 52.7 intelligence · $3.26 / AA task

GLM-5.3 (max): 44.8 intelligence · $2.01 / AA task · Open weights

Highest reasoning effort with both measurements available. Benchmark task costs are not OpenCraft task quotes; your settings and workload can differ.

Input price /M$5.00$1.403.6× cheaper

Output price /M$25.00$4.405.7× cheaper

Cache read /M$0.50$0.261.9× cheaper

Context window1.1M1M

Catalog date4 Sept 20261 mo newer18 Aug 2026

What the same turn costs

Estimates from published token rates — stated token counts, not measurements.

Quick answer2K tokens in, 600 outGPT-6 Astra$0.025GLM 5.3$0.00544.6× cheaper

10-slide deck build60K tokens in, 9K outGPT-6 Astra$0.525GLM 5.3$0.1244.2× cheaper

150-page PDF read200K tokens in, 4K outGPT-6 Astra$1.10GLM 5.3$0.2983.7× cheaper

Capabilities

Bothtool-usereasoning

Only GPT-6 Astravision

GPT-6 Astra: file, image, text → text · GLM 5.3: text → text

Which model should you use?

Start with the token cost for your workload, the context you need, and supported input types. A lower price or larger context window does not establish better answer quality.

To compare answers, open each model in a separate chat and use the same prompt. Token tables use published specs and estimates; any measured AA results above are a separate benchmark.

Try GPT-6 Astra — pricing and availability Try GLM 5.3 — pricing and availability