Claude (Anthropic)
Claude is Anthropic’s large language model family — the dominant AI substrate for the AI-native GTM stack as of 2026, powering Clay’s Claygent agent layer, 11x’s digital worker architecture, and the majority of custom-built AI SDR and enrichment workflows deployed by GTM engineering teams. Anthropic raised a reported $7.3B Series E in early 2025, bringing total funding to over $12B (estimated).