Epoch AI: GPT long-context latency scales quadratically, matching price jumps
Jsevillamol · x · 2026-09-11
Epoch AI measured time-to-first-token (TTFT) scaling and found OpenAI's GPT-5.6 and Anthropic's Claude 5 behave very differently: GPT shows a noticeable quadratic component as context grows while Claude stays closer to linear — mirroring their pricing (GPT prices jump past 272k input tokens; Claude stays fixed).
OpenAI's newly released GPT-6 Astra also raises API pricing beyond 272k tokens, and Epoch's additional latency measurements show similar curvature to GPT-5.6, suggesting an architectural difference rather than pure pricing strategy.
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