Home / Compare / GPT-6 Luna vs gpt-oss-120b

GPT-6 Luna vs gpt-oss-120b

For a typical chat reply (2,000 tokens in, 400 out), gpt-oss-120b costs 1.4× as much as GPT-6 Luna: $0.54 against $0.40 per 1,000 requests at list price on 2026-09-28.

GPT-6 Lunagpt-oss-120b
Input, per 1M tokens$0.10$0.15
Output, per 1M tokens$0.50$0.60
Context window1.05M131K
Classification or routing (600 tokens in, 10 out), per 1,000$0.065$0.096
Chat reply (2,000 in, 400 out), per 1,000$0.40$0.54
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$1.05$1.50
Confidence signalnoyes
Tool callingyesyes
BANKING77, correct of 400320329

Which one should carry your traffic?

If GPT-6 Luna answers your requests as well as gpt-oss-120b, moving that traffic saves 26% on chat-shaped requests. Averages cannot tell you whether it does for your requests. GPT-6 Luna does not expose a confidence signal through OpenRouter, so Gimbix would test it as a full replacement rather than a first answer.

GPT-6 Luna profile · gpt-oss-120b profile · Measure it on your traffic