Opus 5.5 mid-tier beats GPT-6 max at one-fifth the cost

On the GDPval-AA benchmark, Claude Opus 5.5 medium scored 54.5%, beating GPT-6 Astra max's 53.3% at $0.8 per task versus $4.3. Opus 5.5 is also priced about 2.5x cheaper per token than Fable 5.1 and GPT-6 Astra.

2026-09-23 ~ 2026-09-23 · 3 related posts

• Opus 5.5 undercuts Fable 5.1 and GPT-6 Astra by 2.5x per token — haider1 · 2026-09-23
• Opus 5.5 medium beats GPT-6 Astra max 54.5% vs 53.3% at one-fifth the cost per task — haider1 · 2026-09-23
• Opus 5.5 at Medium Beats GPT-6 Astra Max on GDPval-AA at ~80% Lower Cost — nicolechirps · 2026-09-23