Anthropic Opus 5.5 and OpenAI GPT-6 Sol/Luna both promise more capability for less money
Ars Technica AI · rss · 2026-09-23
Ars Technica reports that OpenAI and Anthropic both recently shipped new models pitched on lowering costs. Anthropic announced Opus 5.5, the latest version of its mass-market workhorse model used for coding and complex knowledge work. OpenAI announced GPT-6 Sol and Luna, its middle-tier and smaller models focused on efficiency and speed. Both make the same promise: a little more capability for a lot less money.
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