Claude Opus 4.8 (Anthropic)

Anthropic's Claude Opus 4.8 builds on Opus 4.7 for long, multi-step work, knowledge tasks and vision. It is more likely to flag what it is unsure of than to make unsupported claims, and it spends time thinking only when a request needs it. Use it with 1M tokens of context, five effort levels, web search, image, text and PDF attachments, and structured JSON output.