{"version":"2.0.17","anchor":"haiku-4-5-model-support","canonical_anchor":"haiku-4-5-model-support","heading":"Haiku 4.5 Model Support","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.0.17\/e\/haiku-4-5-model-support","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.0.17","markdown":"### Haiku 4.5 Model Support\n\n**What:** Support for the new Claude Haiku 4.5 model (`claude-haiku-4-5-20251001`), available across all platforms (direct API, Bedrock, Vertex).\n\n**How to use:**\n\n`# Use Haiku 4.5 as your model claude --model claude-haiku-4-5-20251001 # Or use model aliases claude --model haiku45` **Details:**\n\n- Model identifier: `claude-haiku-4-5-20251001`\n- Display name: \"Haiku 4.5\"\n- Platform mappings configured for firstParty, Bedrock (`global.anthropic.claude-haiku-4-5-20251001-v1:0`), and Vertex (`claude-haiku-4-5@20251001`)\n- Vertex region environment variable: `VERTEX_REGION_CLAUDE_HAIKU_4_5`\n- Haiku 4.5 used in plan mode when model preference is set to \"haiku\"\n- **Evidence**: Model detection at `IOA() at line 83108`, platform mappings at lines 83142-83144, model selection logic at `x01() at line 144036` (model identifier \"haiku-4-5\" completely absent from v2.0.15)"}