Pelican MapAN AI FIELD GUIDE
Community record · 2026-10-07

Claude Haiku 5.5 · max reasoning effort

The work

About this work

Simon Willison tested Anthropic's newly released Claude Haiku 5.5 in his blog post 'Claude Haiku 5.5' using the llm CLI. The model defaults to medium reasoning effort and cannot disable thinking. The author tested effort levels from low to max and featured the max-effort output in the article, which took 5 minutes 9 seconds and cost ~3.38 cents. The output depicts a white pelican with a red cap, curved beak, long orange legs on pedals, dark grey bike frame, sun and speed streaks. Archives the article's original WebP preview from static.simonwillison.net; model label is source-reported and unauthenticated; date is the source publication on 2026-10-07.

Date evidence, prompt & provenance

Date precision / evidence: day / source-publication. Source publication: 2026-10-07. Generation date is not independently authenticated.

Recorded date
2026-10-07
Date precision
Day
Date basis
source-publication
Model (source label)
Claude Haiku 5.5
Model attribution
Source-reported, not independently authenticated
Creator / publisher
Simon Willison
Format
Static SVG
Prompt category
Source-documented test
Original prompt
The source does not provide the complete per-run prompt; see the original link
Last updated
2026-10-05
Markdown record