Originally published on AI Tech Connect.
What builders need to know Sonnet 5 shipped 30 June 2026 as Anthropic's mid-tier model, and the company's own framing is blunt: performance "close to that of Opus 4.8, but at lower prices." It does not fully close the gap. On the harder agentic-coding benchmarks Opus 4.8 still leads — but by single digits, not the wide margins that used to separate a mid-tier model from a flagship. The price gap is the real story. Standard Sonnet 5 pricing is 40% cheaper than Opus 4.8 on both input and output tokens, and an introductory rate through 31 August 2026 widens that further. A tokenizer change complicates the sticker-price comparison. Sonnet 5's updated tokenizer can use more tokens per unit of input than its predecessor, so teams migrating should measure their own workloads rather than trust…
Top comments (0)