Claude Haiku 5.5 costs around 75% less to run than Claude Haiku 4.5.
I recognize that for the Sonnet API, speed and cost are the primary differentiators compared to alternative models. When I use Sonnet for specific tasks or agents, both cost and speed become critical factors in evaluating its suitability.
Speed and cost are the primary differentiators of Sonnet compared to alternatives.
I asked @TheSpacerr whether version 5.5 is cheaper to run than versions 4.6 or 4.8, noting that I’m constantly paying for extra credits.
API prices for GPT‑6 Sol and GPT‑6 Luna are 50 % lower than the GPT‑5.6 promotional pricing.
Claude Opus 5.5 was announced as the first model in the Claude 5.5 family, performing at the level of Claude Fable 5.1 for most tasks while costing 40% less to run than Opus 5.
- Model: Claude Opus 5.5 (first of Claude 5.5 family).
- Performance claim: performs at the level of Claude Fable 5.1 for most tasks.
- Cost claim: costs 40% less to run than Opus 5.