Anthropic introduces Claude Opus 5

First in Anthropic's fifth generation, it ships on the Claude API, Claude Code, and Amazon Bedrock with 1M context at $10/$50 per Mtok. Anthropic claims it approaches Fable 5's intelligence at half the price; IPI benchmark attacker success in 15 attempts dropped from 5.5% (Opus 4.8) to 2.0%.