Claude Opus 4.8 Now Available

Claude Opus 4.8 is now available in the Kiro IDE, CLI, and Web. A direct upgrade from Opus 4.7 with stronger self-verification, more efficient tool calling, and better follow-through on long-horizon projects. Rolling out with experimental support to Pro, Pro+, and Power customers. Ships with a 1M context window, 128K max output, and a 2.2x credit multiplier. Inference runs in us-east-1 (N. Virginia) and eu-central-1 (Frankfurt). Restart your IDE or CLI to access it from the model selector. For the Kiro CLI users to be able to get the best experience out of Opus 4.8, they need to be on Kiro CLI v2.5.0 or above. Learn more ->