Reading up on Claude Opus 4.8

Anthropic releases Claude Sonnet 5 as a more agentic, cheaper model, but Hacker News commenters argue it often underperforms Opus 4.8 in real-world tasks and appears optimized for token consumption.

OpenRouter's Fusion, which synthesizes outputs from multiple language models via a judge model, outperformed individual frontier models including GPT-5.5 and Claude Opus 4.8 on deep research tasks, with a budget panel achieving near-frontier performance at half the cost.

Cognition's FrontierCode benchmark measures code mergeability, finding even top models like Claude Opus 4.8 score only 13.4% on its hardest 50 tasks.

Anthropic released Claude Opus 4.8, a modest upgrade with benchmark improvements, new collaboration features like effort control, and a cheaper fast mode.

Anthropic launched Claude Opus 4.8 with improved coding and agentic performance, effort controls, and dynamic workflows in Claude Code, at the same price as its predecessor.