Codex test: GPT-6.1 Terra task round costs about 8 cents at API rates

The Android Soul ran GPT-6.1 Terra, GPT-6.1 Sol and GPT-6 Luna in Codex CLI 0.159.0 with a ChatGPT sign-in on October 26–27, 2026. At Standard API prices, a three-task round cost about $0.0784 for Terra, $0.18 for Sol and $0.01 for Luna; Terra and Sol got all nine runs right, Luna six of nine.

• Terra: $1 per 1M input tokens, $0.05 cached input, $5 output
• Caching cut Terra's round cost 3.4x: $0.0784 vs $0.2665
• Luna passed 6 of 9 runs; two supplier forms came back empty
• Cached reads were 76.4% of Terra's input tokens; output 5–7% of cost