#sub-agents 3 items 6 июл GPT-5.6 Sol Ultra Arrives in Codex with Subagent-Powered Ultra Mode OpenAI tools 11 июн Claude Code v2.1.172–v2.1.173: Nested Sub-Agents Up to 5 Levels Deep Anthropic tools 22 июл Claude Code v2.1.217 caps concurrent subagents and enforces budget halts Anthropic tools