Claude Opus 5.5 and GPT-6 Sol Launched 101 Minutes Apart, Both Cheaper
thursdai_pod · x · 2026-09-29
ThursdAI recaps a wild week: one week after every lab head signed the "pace the frontier" pledge, Anthropic and OpenAI shipped new cheaper models 101 minutes apart — Claude Opus 5.5 (Fable-level, 40% cheaper than Opus 5) and GPT-6 Sol/Luna (half the GPT-5.6 price).
Pricing per 1M tokens: Opus 5.5 is $4 input / $0.20 cached read / $20 output — the cached-read cut matters most for agentic coding bills; GPT-6 Sol is half the price of Opus 5.5 and Luna another 40x cheaper. Both labs improved the everyday model, not just the flagship.
Also covered: Gemini 3.8 Flash TTS topping Hume's quality index with 30-second voice cloning (SynthID watermarked), Meta putting Muse at the center, Grok moving into Teslas, and open source cloning Jev in a week.
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