GPT-5.6 Sol vs GPT-5.6 Luna Codex credit cost

On a daily-coding request, GPT-5.6 Sol costs about 2 Codex credits ($0.08) versus 0.1 credits ($0.00) for GPT-5.6 Luna, so GPT-5.6 Sol costs about 25x as much. Both meter at $0.04 per credit, i.e. exact OpenAI API rates. Verified 2026-08-03.

GPT-5.6 SolGPT-5.6 Luna
Input, credits / 1M1255
Output, credits / 1M75030
API rate in / out, $ / 1M$5.00 / $30.00$0.20 / $1.20
Daily-coding request2 cr ($0.08)0.1 cr ($0.00)
GPT-5.6 Sol details - GPT-5.6 Luna details - Codex Credits - Calculator