Anthropic Deploys Claude Opus 4.8: Setting New Records on NL2Repo (69.7%) and Multi-Hour SWE-Marathon

Anthropic has begun the general rollout of **Claude Opus 4.8**, tailored for enterprise engineering teams executing high-complexity software refactors.

SWE-Marathon & NL2Repo Leadership While smaller models excel at one-line fixes, Opus 4.8 dominates long-horizon repository creation: - **NL2Repo**: **69.7%** (#1 in turning natural language design specs into complete, compilable repositories). - **SWE-Marathon (v1.1)**: **48.8%**, sustaining focus across 8-hour agentic sessions without degradation.

Opus 4.8 pairs natively with the Claude Code CLI and supports extensive steerability through extended system prompt schemas.