Opus 5.5 summary: 66.4% Terminal-Bench, ~40% cheaper to run than Opus 5, cache reads down 60%
Pulled together the key numbers from the Opus 5.5 launch (Sept 22) for anyone deciding whether to switch: Terminal-Bench 4.0: 66.4% (GPT-6 Astra 57.9%, Fable 5.1 55.8%) Pricing: $4 / $20 per 1M tokens, down from $5 / $25 Cache reads: $0.20, down 60% from $0.50 — this is the big one for agent worklo…
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- 2026-09-24 14:59 · r/artificial
Opus 5.5 summary: 66.4% Terminal-Bench, ~40% cheaper to run than Opus 5, cache reads down 60%