Claude Opus 5.5 and OpenAI GPT-6 Sol & Luna both launch today with lower costs

Ben Schoon· Sep 22, 2026 · 8:20 PM UTC ·4 min read · 0 reactions · 0 comments · 4 views

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TL;DR · WeSearch summary

Claude Opus 5.5 was up to bat first today, so we’ll start there. Anthropic explains that its latest model update performs at the level of Claude Fable 5.1 on “most work” while cutting costs to run by around 40% compared to Opus 5 – which was already around half the price of Fable 5. Opus 5.5 requires less compute to serve than Opus 5, and its pricing reflects that.

Key facts

▪Claude Opus 5.5 was up to bat first today, so we’ll start there.
▪Anthropic explains that its latest model update performs at the level of Claude Fable 5.1 on “most work” while cutting costs to run by around 40% compared to Opus 5 – which was already around half the price of Fable 5.
▪Opus 5.5 requires less compute to serve than Opus 5, and its pricing reflects that.

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Original publisher	9to5Google
Canonical URL	https://9to5google.com/2026/09/22/claude-opus-5-5-and-openai-gpt-6-sol-luna-both-launch-today-with-lower-costs/
Publication time	Tue, 22 Sep 2026 20:20:00 +0000
Retrieval time	2026-09-22T20:28:57.359Z
Last seen	2026-09-22T20:28:57.359Z
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