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GPT-5.4 vs Qwen3.8 Flash

For a typical chat reply (2,000 tokens in, 400 out), GPT-5.4 costs 23× as much as Qwen3.8 Flash: $11.00 against $0.488 per 1,000 requests at list price on 2026-09-28.

GPT-5.4Qwen3.8 Flash
Input, per 1M tokens$2.50$0.15
Output, per 1M tokens$15.00$0.47
Context window1.05M1M
Classification or routing (600 tokens in, 10 out), per 1,000$1.65$0.0947
Chat reply (2,000 in, 400 out), per 1,000$11.00$0.488
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$27.50$1.44
Confidence signalnoyes
Tool callingyesyes
BANKING77, correct of 400not measured316

Which one should carry your traffic?

If Qwen3.8 Flash answers your requests as well as GPT-5.4, moving that traffic saves 96% on chat-shaped requests. Averages cannot tell you whether it does for your requests. Qwen3.8 Flash exposes a confidence signal, so Gimbix can let it answer first and hand unsure cases to GPT-5.4.

GPT-5.4 profile · Qwen3.8 Flash profile · Measure it on your traffic