Opus 5.5 returns 40% cheaper, OpenAI ships GPT 6 Sol and Terra, Meta goes all in on Muse
altryne · x · 2026-09-26
Alex Volkov's ThursdAI newsletter recaps a packed week:
- Claude Opus 5.5 ships: billed as Opus 4.6-level intelligence at 40% lower cost, with a more natural conversational tone; it even served as live producer on the show, doing chyrons, timing and fact-checks.
- OpenAI released GPT 6 Sol and Terra (Luna) ahead of DevDay, halving prices hours before/after Anthropic's release — mocking the labs' "pacing the frontier" pledge.
- Meta went all in on Muse at Connect, framed as assistants rather than just agents.
- Voice: Google claims the best TTS available, cloning voices in 30 seconds; Grok can also order Starbucks from your Tesla.
- Guests included Peter Gostev (Arena), Nisten, Yam Peleg, Wolfram Ravenwolf, and JevBench creator Florian S. Volkov notes Opus 5.5 co-wrote the newsletter after ingesting two hours of his voice, passing as 90% human-written.
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