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brianletort.aiD. Brian Letort, Ph.D.

AI Market · Forecast desk · hit · software

62% · hit

GPT-5.6 reaches broad GA with the Terra tier priced at or below $2.50/$15 per MTok — half of GPT-5.5's rate — confirming a closed-lab repricing cycle rather than a one-off Sonnet 5 cut, by August 31, 2026.

Back to the bookIssue 2026-W27

Outcome

hitcalled at 62%brier contribution 0.144

Hit, seven weeks early. GPT-5.6 went GA Jul 9 with Terra at exactly $2.50/$15 per MTok. Grok 4.5's $2/$6 launch the day before makes it a three-vendor repricing cycle (Sonnet 5, Terra, Grok 4.5), not a one-off.