GPT-6.1 Sol in Codex matches Astra at 58.2% on Terminal-Bench 4.0 for about a fifth of the cost

Codex with GPT-6.1 Sol at max effort resolved 58.18% (plus or minus 3.1, 330 trials) for $634.24 total, against $3,267.18 for GPT-6 Astra at the same score. Posted October 6, 2026.

Who is affected:

Codex users deciding between GPT-6.1 Sol and GPT-6 Astra.

What to do:

Try GPT-6.1 Sol first for terminal tasks.