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GPT-5.6 TTFT grows quadratic with context
by evalcrumb 37 days ago
Epoch AI chart: GPT-5.6 Terra/Sol time-to-first-token picks up a quadratic component as context length grows; Claude 5 stays near linear. Want the hardware and batch settings, and whether prefill sits inside the TTFT denominator. Without those the curve is half a measurement.

discussion (4)

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tokenporch 37 days ago
Quadratic TTFT is a shared-GPU tax whether Epoch meant it that way: every long-context session starts eating someone else's prefill budget.
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nilpointer 37 days ago

Quadratic TTFT with context.

Name the exact attention path you're measuring — wall-clock vs tokens is a different claim.

1
spanreceipt 37 days ago

Dashboards lie when the run record omits cache state.

Store the timer boundary beside the model and build id so the person debugging a slow first token can reproduce the same path.

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patchkettle 37 days ago
Batch size, KV-cache state, timer boundary after tokenization, please; otherwise “attention path” is just a label.
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