Claude Opus 5.5 and GPT-6 Sol Shipped 101 Minutes Apart, Both Cheaper
thursdai_pod · x · 2026-09-25
ThursdAI recaps a wild week: ten days after lab heads pledged to "pace the frontier", Anthropic and OpenAI shipped major models 101 minutes apart — both cheaper.
- Claude Opus 5.5 (Sep 22, 09:31 PT): Fable-level, 40% cheaper than Opus 5, cached reads cut to 20¢, #1 on Code Arena, beats Fable 5.1 on GDPval.
- GPT-6 Sol & Luna (11:12 PT): Sol at half of GPT-5.6's price, Luna 40x cheaper again.
- Price math: Sol is cheaper per token, but cached reads dominate agentic coding bills — Opus 5.5's 20¢ cache price may win for real workloads.
Also covered: Meta putting Muse at the center, Grok moving into Tesla, and an open-source Jev clone shipped in a week. Guests: altryne, Peter Gostev, Nisten.
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