GPT-6.1 Sol delivers near-flagship intelligence at a quarter of the cost
As seen on the 24/7 Wall St. homepage on September 29, 2026.
Frontier intelligence at a quarter of the cost per task, shipped on a seven-day replacement cycle, is what inference-cost deflation looks like for anyone paying for AI compute.
GPT-6.1 Sol replaces GPT-6 Sol after just 7 days. It scores 1 point below GPT-6 Astra in the Intelligence Index at less than one quarter of the Cost per Task Pricing matches GPT-6 Sol at $2/$10 per million input/output tokens, except that the cache read discount rises from 90% https://t.co/LcuAxgLSBj
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GPT-6.1 Sol arrived just seven days after GPT-6 Sol, immediately replacing it at the same input and output pricing.
Despite the rapid turnover, the model lands only 1 point below GPT-6 Astra on the Intelligence Index, a gap that makes the older, pricier model difficult to justify for most workloads.
The one pricing change from its predecessor is an expanded cache read discount, which rises from the 90% that GPT-6 Sol offered, lowering the effective cost further for applications that lean heavily on cached context.
A seven-day replacement cycle at flat list prices is what sustained inference-cost deflation looks like in practice. Developers and enterprises budgeting for AI compute are facing a market where frontier-grade capability is repriced downward faster than procurement cycles can track.