Opus 5.5 is cheaper and smarter while GPT-6 Sol lags, poster says ahead of DevDay

Timurs Jeparskis @TJeparskisOriginally posted 2026.09.28

Open original on X

Never in its history has OpenAI headed into DevDay in such a vulnerable position! Opus 5.5 is both way cheaper and noticeably smarter than Astra, while GPT-6 Sol is lagging too far behind Opus in raw intelligence to capitalize on its price advantage. Especially since there are already rumors circulating about Sonnet 5.5 coming out! Because of that, Claude Pro offers far better value per dollar right now in terms of usage limits than ChatGPT Plus! DevDay is literally OpenAI's last chance to keep from hemorrhaging subscribers!!!