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Kimi K3 vs GPT-6 Astra

For a typical chat reply (2,000 tokens in, 400 out), GPT-6 Astra costs 3.3× as much as Kimi K3: $40.00 against $12.00 per 1,000 requests at list price on 2026-09-28.

Kimi K3GPT-6 Astra
Input, per 1M tokens$3.00$10.00
Output, per 1M tokens$15.00$50.00
Context window1.05M1.05M
Classification or routing (600 tokens in, 10 out), per 1,000$1.95$6.50
Chat reply (2,000 in, 400 out), per 1,000$12.00$40.00
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$31.50$105
Confidence signalyesno
Tool callingyesyes

Which one should carry your traffic?

If Kimi K3 answers your requests as well as GPT-6 Astra, moving that traffic saves 70% on chat-shaped requests. Averages cannot tell you whether it does for your requests. Kimi K3 exposes a confidence signal, so Gimbix can let it answer first and hand unsure cases to GPT-6 Astra.

Kimi K3 profile · GPT-6 Astra profile · Measure it on your traffic