Claude Opus 5.5 vs Kalmia
aka Opus 5.5 vs Kalmia (Arena)
Pre-release Kalmia is an unreleased model seen in Arena testing under a codename; the name may change.
Posts
1
About this matchup
Claude Opus 5.5 vs Kalmia in real side-by-side tests: 1 post from X where both got the same prompt. Judge coding ability from the actual outputs.
Opus 5.5 vs Kalmia: which is better for coding?
Which is better for coding, Opus 5.5 or Kalmia?
None of the 1 post here names one of the two as the better result, so judge the outputs above for the work you care about.
What have Opus 5.5 and Kalmia been tested on?
The most-viewed of the 1 post: walking 3D giraffe, four models in Arena (@Haleeeemahh). Categories: 3D & Shaders, Animations/SVG.
How many side-by-side tests compare Opus 5.5 and Kalmia?
1 post from X, posted Oct 22, 2026, by @Haleeeemahh. Every one is listed above with its video and a link to its post on X.
Summary
Claude Opus 5.5 and Kalmia appear together in 1 post on X: walking 3D giraffe, four models in Arena (@Haleeeemahh). It is part of larger lineups with other models. None of these posts report cost or time per model.
What each post reports
| Post | Model | Time | Cost | Tokens | Post |
|---|---|---|---|---|---|
| Walking 3D giraffe, four models in Arena@Haleeeemahh | Claude Opus 5.5 | — | — | — | X post |
| Walking 3D giraffe, four models in Arena@Haleeeemahh | Kalmia | — | — | — | X post |
Only numbers stated in each post. “—” means the post doesn’t say.
Quick facts
| Model | Vendor | Released | Input $/1M tokens | Output $/1M tokens | Context (tokens) | Official links |
|---|---|---|---|---|---|---|
| Claude Opus 5.5 | Anthropic | 2026-09-22 | $4 | $20 | 1,000,000 | Model docs |
| Kalmia |
From the vendors’ official pages, checked 2026-10-19. Standard API list prices; each value links its source and a blank cell could not be verified. The archive’s own numbers above are what each post states.
Models
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