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This week on the blog
The AI frontier is a plateau — and one of the four is open
Claude Opus 5, Claude Fable 5, GPT-5.6 and Kimi K3 land within 3.6 points of each other on intelligence while their prices vary by 3.3×.
Opus 5 against Fable 5 — newer, better, half the price
Claude Opus 5 shipped forty-five days after Claude Fable 5. It scores higher on both composite indices and costs exactly half as much per token. That should not happen, and the reason it does is more interesting than the ranking.
Kimi K3 is open-weight — and that is not the same as runnable
It scores 57.1 on intelligence at $15 per million output tokens, ahead of GPT-5.6 Terra at the same price and 1.8 points behind GPT-5.6 Sol, which costs twice as much. Then you read the parameter count: 2.8 trillion.
Which GPT-5.6 tier? The wrong question
Sol, Terra and Luna shipped on the same day at $30, $15 and $6 per million output tokens. At maximum effort they sit 7.7 intelligence points apart. The six effort levels inside Luna alone sit 24.6 points apart.
Today in open-source AI
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