Claude Instant is a closed-weights model from Anthropic, released August 9, 2023. It has an ECI score of 120 and ranks 188th of 249 tracked models. At the time of its release, it ranked 3rd of 22 tracked models. At $0.80/Mtok for input tokens and $2.40/Mtok for output tokens, it is less expensive per token than similarly-capable models.