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Current Claude model IDs (as of 2026-03)
Constantsยง
- HAIKU_
4_ 5 - Fastest and cheapest - simple tasks
- OPUS_
4_ 5 - OPUS_
4_ 6 - Most intelligent model - agents, coding, deep reasoning
- SONNET_
4_ 5 - SONNET_
4_ 6 - Best speed/intelligence balance - general purpose