Model comparison

GPT-5.6 Terra vs GLM 5.3 Flash

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

openaiGPT-5.6 Terraopenai/gpt-5.6-terraz-aiGLM 5.3 Flashnewz-ai/glm-5.3-flash

Measured intelligence and task cost

Adjacent options on the measured intelligence–cost frontier. Artificial Analysis index v4.3, updated 2026-09-21.

GLM 5.3 Flash: 41.8 intelligence · $0.253 / AA task · Open weights

GPT-5.6 Terra (max): 42.1 intelligence · $1.40 / AA task

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

Input price /M$1.00$0.156.7× cheaper

Output price /M$6.00$0.5012× cheaper

Cache read /M$0.10$0.052× cheaper

Context window1.1M1M

Catalog date9 Jul 202626 Aug 20262 mo newer

What the same turn costs

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

Quick answer2K tokens in, 600 outGPT-5.6 Terra$0.0056GLM 5.3 Flash$0.00069.3× cheaper

10-slide deck build60K tokens in, 9K outGPT-5.6 Terra$0.114GLM 5.3 Flash$0.0138.4× cheaper

150-page PDF read200K tokens in, 4K outGPT-5.6 Terra$0.224GLM 5.3 Flash$0.0327× cheaper

Capabilities

Bothtool-usevisionreasoning

GPT-5.6 Terra: file, image, text → text · GLM 5.3 Flash: text, image, video → 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-5.6 Terra — pricing and availability Try GLM 5.3 Flash — pricing and availability