Topic
AI language models designed to autonomously write, debug, and complete software engineering tasks, benchmarked on agentic coding performance and cost.
Anthropic prices Claude Sonnet 5.5 at half Opus 5.5's per-token rate, but Artificial Analysis measured $7.67 per task at max effort against Opus's $5.98. In The New Stack's own tests, runs that were billed but never finished decided which model cost less per completed job.
Reality
Claude Opus 5.5 matched Fable 5.1 on every hidden test in two New Stack coding trials, at $0.75 and $1.42 per run against $1.50 and $1.96. It needed more tokens and more minutes to get there, so the saving holds only for tasks that resemble these.
Reality
Nvidia licensed Poolside's Model Factory and hired 109 of a team its CEO put at fewer than 115 engineers and researchers. The corporate shell survives; the roadmap does not.
Reality
Sonnet 4.5 still leads GPT-5 on the coding leaderboards, and GPT-5 lists about 46 percent below it on a 5:1 token mix. Anthropic's current Sonnet undercuts both of Sonnet 4.5's list prices, and that complicates a routing plan built on the older pair.
Reality
A non-exclusive license and a hiring raid give the chipmaker its own open-weight model shop. Anyone planning around a neutral silicon supplier should reprice that.
Reality