Not all model upgrades are upgrades

TLDR Dev · 1 week ago ● 2 sources

Anthropic's Claude Sonnet 5 has lower per-token pricing but consumes 10x to 12x more tokens on common agent tasks, making it 3.7x more expensive on code upgrades despite the 33% per-token discount. On architecture tasks, Sonnet 5 produced lower quality output (78% vs 90% on idiomatic evaluation) while consuming vastly more tokens, though it excelled at precise instruction-following on code upgrade tasks. Neither model overcomes undocumented information gaps, so improving agent grounding content delivers more value than upgrading models.