Anthropic has launched Claude Sonnet 5, a new model that offers performance comparable to Opus-class models at a lower Sonnet price point. However, users face a significant price increase on September 1, 2026, due to a new tokenizer that counts approximately 30% more tokens for the same text. This, combined with the end of introductory pricing, could lead to a roughly 50% cost jump for workloads compared to August. The model also introduces behavioral changes that will cause older parameter requests to fail. AI
IMPACT Users must plan for a significant cost increase due to a new tokenizer and expiring introductory pricing.
RANK_REASON New model release from a frontier lab (Anthropic). [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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