swyx Makes Opus 5.5 the Default for AINews After Head-to-Head Test, Industry Cuts Prices 40-50%
rickasaurus · x · 2026-09-23
Latent Space's swyx switched AINews' default model to Claude Opus 5.5 after a side-by-side test against GPT-6 Sol called the difference 'night and day'.
Key points:
- Opus 5.5, first of the Claude 5.5 family, matches Claude Fable 5.1 on most tasks and costs 40% less to run than Opus 5; the launch tweet hit 17.2M views.
- Theo reports the model is smaller than Opus 5, suggesting major post-training gains; it beats or challenges Fable/Astra on most benchmarks.
- Artificial Analysis notes $5.98 per Intelligence Index task (vs Opus 5's $5.86) but with significantly higher token usage — up 80% on some frontier tasks — offsetting price cuts.
- Labs across the board cut prices 40-50%; Anthropic unusually emphasized writing quality: key info up front, follows writing rules, better long sessions.
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