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GPT-6 Astra vs GLM 5.3

For a typical chat reply (2,000 tokens in, 400 out), GPT-6 Astra costs 17× as much as GLM 5.3: $40.00 against $2.41 per 1,000 requests at list price on 2026-09-28.

GPT-6 AstraGLM 5.3
Input, per 1M tokens$10.00$0.325
Output, per 1M tokens$50.00$4.40
Context window1.05M1.31M
Classification or routing (600 tokens in, 10 out), per 1,000$6.50$0.239
Chat reply (2,000 in, 400 out), per 1,000$40.00$2.41
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$105$4.80
Confidence signalnoyes
Tool callingyesyes

Which one should carry your traffic?

If GLM 5.3 answers your requests as well as GPT-6 Astra, moving that traffic saves 94% on chat-shaped requests. Averages cannot tell you whether it does for your requests. GLM 5.3 exposes a confidence signal, so Gimbix can let it answer first and hand unsure cases to GPT-6 Astra.

GPT-6 Astra profile · GLM 5.3 profile · Measure it on your traffic