{"event":{"id":"evt-claude21-20231121","dedupe_key":"long_context_tool_model_release:2023-11-21:anthropic-releases-claude-2-1","event_type":"long_context_tool_model_release","title":"Anthropic releases Claude 2.1","summary":"Claude 2.1 became available with 200K context, system prompts and beta tool use.","occurred_at":"2023-11-21T00:00:00.000Z","published_at":"2023-11-21T00:00:00.000Z","observed_at":"2026-10-08T15:42:00.000Z","reconstructed_at":"2026-10-08T15:50:00.000Z","ingest_type":"live_world_scan","locations":null,"status":"verified","confidence":0.99,"metadata":{"actors":["Anthropic"],"what_happened_at_time":"Claude 2.1 became available with 200K context, system prompts and beta tool use.","evidence_at_time":"Anthropic specifies a 200K window, system prompts and beta tool use.","affected_layers":["layer-models","layer-software","layer-agents","layer-human"],"change_kind":"multimodal_platform_expansion","q3_continuity":"Q3 had long-context assistants and orchestration frameworks.","retrospective_inference":"Q4 continues convergence of long context and tool use across providers.","uncertainty":"Tool use was beta."},"created_at":"2026-10-08T17:00:00.115Z","updated_at":"2026-10-08T17:00:00.115Z"},"artifacts":[{"id":"art-claude21-20231121","dedupe_key":"29890bfb42d09489c0e15144d21fdd35f81546370ae7f29a28a5cf343efa3343","canonical_url":"https://www.anthropic.com/news/claude-2-1","evidence_locator":"","artifact_type":"long_context_tool_model_release","title":"Claude 2.1","summary":"Claude 2.1 became available with 200K context, system prompts and beta tool use.","creator_entities":["Anthropic"],"released_at":"2023-11-21T00:00:00.000Z","content_hash":null,"metadata":{"historical_scope":"2023-Q4"},"created_at":"2026-10-08T17:00:00.102Z","updated_at":"2026-10-08T17:00:00.102Z","relation":"evidenced_by"}],"signals":[{"id":"sig-q4-multimodal-platform-expansion","statement":"Long-context, multimodal and tool-capable model interfaces expanded across multiple providers and developer platforms while some frontier variants remained preview or unavailable.","signal_type":"multimodal_platform_expansion","direction":"increasing","confidence":0.98,"epistemic_status":"supported_inference","mapping_mode":"retrospective","reconstructed_at":"2026-10-08T15:50:00.000Z","created_at":"2026-10-08T17:00:00.123Z","updated_at":"2026-10-08T17:00:00.123Z"}]}