Home / Compare / gpt-oss-120b vs GLM 5.3 Flash

gpt-oss-120b vs GLM 5.3 Flash

For a typical chat reply (2,000 tokens in, 400 out), gpt-oss-120b costs 1.1× as much as GLM 5.3 Flash: $0.54 against $0.50 per 1,000 requests at list price on 2026-09-28.

gpt-oss-120bGLM 5.3 Flash
Input, per 1M tokens$0.15$0.15
Output, per 1M tokens$0.60$0.50
Context window131K1.31M
Classification or routing (600 tokens in, 10 out), per 1,000$0.096$0.095
Chat reply (2,000 in, 400 out), per 1,000$0.54$0.50
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$1.50$1.45
Confidence signalyesyes
Tool callingyesyes
BANKING77, correct of 400329320

Which one should carry your traffic?

If GLM 5.3 Flash answers your requests as well as gpt-oss-120b, moving that traffic saves 7% on chat-shaped requests. Averages cannot tell you whether it does for your requests. GLM 5.3 Flash exposes a confidence signal, so Gimbix can let it answer first and hand unsure cases to gpt-oss-120b.

gpt-oss-120b profile · GLM 5.3 Flash profile · Measure it on your traffic