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Claude Opus 5.5 & Sonnet 5: The Definitive Guide to Autonomous Software Engineering (Late September 2026)★ TOP BENCHMARK
code22 min read48,200 US Vol/mo

Claude Opus 5.5 & Sonnet 5: The Definitive Guide to Autonomous Software Engineering (Late September 2026)

Independent technical audit of Anthropic's Claude Sonnet 5 and the newly released Claude Opus 5.5 (Sept 22, 2026). Benchmarking SWE-bench Verified pass rates (79.4%), dynamic thinking budgets (0 to 64k tokens), prompt cache economics, and Claude Code CLI workflows.

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