Model comparison

GPT-5.6 Terra 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-5.6 Terraopenai/gpt-5.6-terraz-aiGLM 5.3newz-ai/glm-5.3

Measured intelligence and task cost

An efficiency pick and its closest intelligence leader by benchmark score. Artificial Analysis index v4.3, updated 2026-09-21.

GPT-5.6 Terra (max): 42.1 intelligence · $1.40 / 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$1.001.4× cheaper$1.40

Output price /M$6.00$4.401.4× cheaper

Cache read /M$0.102.6× cheaper$0.26

Context window1.1M1M

Catalog date9 Jul 202618 Aug 20261 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$0.0054

10-slide deck build60K tokens in, 9K outGPT-5.6 Terra$0.114GLM 5.3$0.124

150-page PDF read200K tokens in, 4K outGPT-5.6 Terra$0.2241.3× cheaperGLM 5.3$0.298

Capabilities

Bothtool-usereasoning

Only GPT-5.6 Terravision

GPT-5.6 Terra: 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-5.6 Terra — pricing and availability Try GLM 5.3 — pricing and availability