Home / Compare / Claude Sonnet 5 vs gpt-oss-120b

Claude Sonnet 5 vs gpt-oss-120b

For a typical chat reply (2,000 tokens in, 400 out), Claude Sonnet 5 costs 15× as much as gpt-oss-120b: $8.00 against $0.54 per 1,000 requests at list price on 2026-09-28.

Claude Sonnet 5gpt-oss-120b
Input, per 1M tokens$2.00$0.15
Output, per 1M tokens$10.00$0.60
Context window1M131K
Classification or routing (600 tokens in, 10 out), per 1,000$1.30$0.096
Chat reply (2,000 in, 400 out), per 1,000$8.00$0.54
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$21.00$1.50
Confidence signalnoyes
Tool callingyesyes
BANKING77, correct of 400308329

Which one should carry your traffic?

If gpt-oss-120b answers your requests as well as Claude Sonnet 5, moving that traffic saves 93% on chat-shaped requests. Averages cannot tell you whether it does for your requests. gpt-oss-120b exposes a confidence signal, so Gimbix can let it answer first and hand unsure cases to Claude Sonnet 5.

Claude Sonnet 5 profile · gpt-oss-120b profile · Measure it on your traffic