Event · User reviews

Haiku 5.5: what people who tried it said

Hands-on reviews posted on X and Threads in the first day. Posts from Anthropic's official accounts and staff are left out, and both praise and criticism are included.

1. Positive@kickingkeys · X ↗

   Surprisingly good at painting with code

   They had Haiku 5.5, GPT-6 Luna and Sonnet 5.5 draw the same picture in code and posted the results side by side. At about a twentieth of Sonnet's price, the result was better than expected.

2. Positive@RLanceMartin · X ↗

   Good for running many subagents at once

   Under 100K input tokens, it is 20 times cheaper than Sonnet 5.5 and fast, they said. They also shared a map demo in which many Haiku 5.5 subagents stream drawing commands to one canvas.

3. Positive@addyosmani · X ↗

   The team uses it as Opus 5.5's helper

   Developer Addy Osmani said his team likes Haiku 5.5 as a subagent alongside Opus 5.5, and noted that its effort level can be adjusted.

4. Positive@aykenonchain · X ↗

   Better than expected, will start most work on Haiku

   Citing official tests where it beat GPT-6 Luna on knowledge work, computer use, coding and visual reasoning, they called it better than expected. They plan to start with Haiku and use a bigger model only when needed.

5. Mixed@larrabee.kor · Threads ↗

   Measured at about 200 tokens per second

   Timed in Claude Code, Haiku 5.5 was fastest at roughly 200 tokens per second, against about 100 for Sonnet and Opus. On the GPT side, Luna came close to 100 and the others ran at 20 to 30. Results may vary with the method, they added.

6. Mixed@LuminaBench · X ↗

   Outside benchmarks call it 'not bad'

   They reported 43.40 on the Artificial Analysis intelligence index, around Kimi K3, and ahead of Luna in the same class.

7. Negative@dhruvtwt_ · X ↗

   Some call it dumb

   After trying it, one user posted that it is 'insanely dumb', which drew about 150 likes. They did not say what task it failed.

8. Negative@cyapstaye · Threads ↗

   Cheap, light models already exist

   In a post titled 'Haiku 5.5, honest review', they asked why anyone needs it when cheap, light models are already plentiful.

9. Negative@xoaanya · X ↗

   Has anyone actually used Haiku?

   They posted that they still don't know anyone who uses Haiku for anything, a skeptical take on how much small models get used.