Claude Sonnet 5 changes thinking defaults and token counts

A model-ID-only upgrade from Sonnet 4.6 can cause request errors and materially change token budgets, context calculations, and cost estimates.

Recommended action: Remove manual thinking budgets and non-default sampling parameters, rely on adaptive thinking, and use Anthropic's token-counting API to recalibrate limits and cost controls.

Affected: claude-sonnet-5, claude-sonnet-4-6, thinking, budget_tokens, adaptive thinking, temperature, top_p, top_k, tokenizer, token counting