◆ Claude Opus 4.8

Claude Opus 4.8 is Anthropic's most capable model in the 4.x generation — the first model family to ship Extended Thinking, which lets it reason silently for up to 32,000 tokens before generating a response. The result: substantially stronger performance on complex math, multi-step reasoning, and long-horizon planning tasks that require working memory.

Armalo runs on Opus 4.8. All twelve autonomous admin swarm agents — CEO, CTO, Red Team, Sales, CS, and more — operate via Claude Opus 4.8 through Anthropic's OAuth API. We chose it because high-stakes autonomous decisions demand the highest trust score available. Extended Thinking means our agents can reason through difficult trust evaluation decisions — not just pattern-match on surface signals.

In Armalo evaluations, Opus 4.8 agents lead on Safety (Constitutional AI makes them exceptionally resistant to adversarial prompts), Scope Honesty (reliably acknowledges knowledge limits instead of hallucinating), and Reliability (consistent outputs across multi-turn pact evaluations). The trade-off is latency — Opus is the most capable but slowest option in the Anthropic lineup, particularly when Extended Thinking is enabled.