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8 items · 6 sources · 7 days

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Operational story trace

Claude 5.5

Current stateShipping · full lineupstatus changed Oct 7

Latest change

Anthropic released Claude Haiku 5.5 on Oct 7, completing the 5.5 lineup with a fast, low-cost model to replace Haiku 4.5, which was nearly a year old.

Earlier contextThe story so far

Claude Opus 5.5 shipped Sep 22 on AWS and direct, an hour before OpenAI's GPT-6 Sol and Luna, and the launch coincided with 40-50% price cuts across vendors. Sonnet 5.5 followed Sep 28 with a lower cost per task.

editor-curated · source-linked

State over time

● Opus · Sep 22Haiku · Oct 7 ●
  • Opus · Sep 22
  • Sonnet · Sep 28
  • Haiku · Oct 7
LAUNCH · Sep 22–23
Opus 5.5 ships alongside GPT-6 Sol and Luna
3 sources · show sources ▾
COST · Sep 24–25
Anthropic details what tasks cost on Opus 5.5
2 sources · show sources ▾
SONNET · Sep 28–29
Sonnet 5.5 lands on AWS; Opus 5.5 gets hands-on praise
✓ corroborated across 2 sources
2 sources · show sources ▾
NOW · Oct 7
Haiku 5.5 completes the lineup
1 source · show source ▾

Claude Haiku 5.5

simon_willisonOct 7

Haiku 5.5 replaces the nearly year-old Haiku 4.5.

What to watch — open questions

  • How does Haiku 5.5 pricing compare with Haiku 4.5's $1 per million input tokens?
  • Do the Sep 22 vendor price cuts hold through Q4?
How this thread was built
editor wrote the arc · 4 beatscorroboration 1 source checkswatcher 1 status change

Storylines are threaded mechanically from the feed: stories that share a distinctive anchor across multiple days and sources. Each item links to its original source. The evidence trace, current state, and open questions are written by the editor routine and refreshed whenever a new beat lands.