Opus 5.5 vs GPT-6 Sol

Sep
23
Banner comparing Opus 5.5 and GPT-6 Sol scores and task costs, with callouts for Luna’s $0.07 per Intelligence Index task and Grok 4.7’s more than doubled output tokens.

Opus 5.5, GPT-6 Sol, GPT-6 Luna and Grok 4.7 compared on cost

Opus 5.5's lower rates left max-effort task cost roughly level with Opus 5 in one independent test. Sol and Luna roughly halved their cost per task, while Grok 4.7 used more than twice the output tokens at unchanged rates.
4 min read