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Opus 5.5 is most capable than GPT-6 Astra for most tasks.
Provisional assessment
Confidence not measured.
Accuracy: Misleading. The excerpts do not establish that Opus 5.5 is more capable for most tasks overall. Evidence is mixed: one 12-task personal test scored Opus 8–4 (S5P1), and one outlet says its Intelligence Index snapshot was 58 vs 53 (S4P1), but another comparison says the verdict is a split—Opus better for coding/knowledge work, Astra better for math, science, and abstract reasoning (S3P1-S3P2). Independent apples-to-apples evidence cited here shows a tie on Terminal-Bench 4.0 (S4P2-S4P3). So a broad “most tasks” superiority claim overstates the available evidence.