As of: 2026-10-09 19:24 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/p/2026-10-07-claudedevs-haiku-5-5-subagent/

# ClaudeDevs: Haiku 5.5 in the Claude Platform and Claude Code, pitched as a subagent for Opus/Sonnet 5.5

ClaudeDevs (@ClaudeDevs), X, 2026-10-07.
Source: https://x.com/ClaudeDevs/status/2107895955144208813

## 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.

Archived 2026-10-09 via fxtwitter (unofficial).
Counts: 1,188,883 views, 12,974 likes, 782 reposts, 304 replies (at fetch time)
Media: https://video.twimg.com/amplify_video/2107895236525723648/vid/avc1/1920x1080/m8zBVjNijWQ4uew-.mp4?tag=29

## Cited in

- 2026-10-07: [Claude Haiku 5.5 released at $0.10/$0.50, matching GPT-6 Luna](https://postcutoff.com/e/2026-10-07-claude-haiku-5-5/)