Anthropic released Claude Haiku 5.5 on October 7, 2026, the smallest model in its Claude 5.5 family. The model ranks #27 on Agent Arena and #30 in Code Arena’s WebDev category. Key upgrade is the 1M-token context window (up from 200k) and support for browser tools and subagent delegation. API costs start at $0.10 per million input tokens and $0.50 per million output tokens, approximately 75% lower than Haiku 4.5. The model is available on Claude.ai, Anthropic API, Amazon Bedrock, Google Cloud and Microsoft Foundry.
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