Claude Sonnet 5 Review 2026: Anthropic's Cheaper Agent Model Tested
Anthropic launched Claude Sonnet 5 on June 30, 2026 — a cheaper, more agentic model that closes the gap with Opus 4.8. Here's what changed, what it costs, and how it stacks up against GPT-5.5 and Gemini 3.5 Flash.
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