Anthropic launches Claude Sonnet 5.5: 56 on AA Index, just 2 points behind Opus 5.5
jarrodwatts · x · 2026-09-29
Per Artificial Analysis, Anthropic has launched Claude Sonnet 5.5, scoring 56 on its Intelligence Index — just 2 points behind Opus 5.5 (max) and #2 overall. With max effort it gains 18 points over Sonnet 5, while posting the highest Output Tokens per Task seen yet. Pricing is unchanged from Sonnet 5 at $0.2/$2/$10 per 1M cache input/input/output tokens. Takeaway: flagship-level ability at the same price, but with heavier per-task output token spend.
More from Models
- AI triages ER cases correctly 78% of the time vs about 30% for attending physicians — realmeetjames · 2026-09-29
- Bindu Reddy: Sonnet 5.5 Scores Below Terra, Stick to DeepSeek Flash — bindureddy · 2026-09-29
- Early-access user claims Sonnet 5.5 is a colossal leap over Sonnet 5 and blazing fast — rudrank · 2026-09-29
- Creative Writing Benchmark update: 56 models, 102,592 judgments, Opus 5.5 near top — zero0_one1 · 2026-09-29
- Meta finds AI judges prefer AI slop — bad news as agencies score proposals with AI — jmugan · 2026-09-29
- Anthropic IPO delayed to November amid reports of all-model 5.5 rollout ahead of Claude 6 — fsharpman · 2026-09-29