ClaudeDevs: Haiku 5.5 in the Claude Platform and Claude Code, pitched as a subagent for Opus/Sonnet 5.5
ClaudeDevs @ClaudeDevsX
Why it matters
Developer-facing launch post with the intended use (subagent for summaries, compactions, database queries); about 1.19M views (fxtwitter, Oct 9).
Summary
“Haiku 5.5 is now available in the Claude Platform and Claude Code. On average, it costs around 75% less to run than Haiku 4.5. It pairs well with Opus 5.5 or Sonnet 5.5 as a subagent. Use it for high-volume, cost-sensitive tasks like summaries, compactions, or database queries.” A follow-up post in the thread (about 417k views) gives the tiered price: $0.10/$0.50 per million tokens under 100K tokens with cache reads at $0.01, and $0.50/$2.50 above, with cache reads at $0.05. Read via api.fxtwitter.com on 2026-10-09: about 1.19M views.
Archived text
Haiku 5.5 is now available in the Claude Platform and Claude Code. On average, it costs around 75% less to run than Haiku 4.5.
It pairs well with Opus 5.5 or Sonnet 5.5 as a subagent. Use it for high-volume, cost-sensitive tasks like summaries, compactions, or database queries.
Quoting @claudeai: Introducing Claude Haiku 5.5: the cheapest, fastest, and most capable small model we’ve ever released.
On average, it costs around 75% less to run than Claude Haiku 4.5.