Claude Opus 5.5 vs Fugu Ultra v2
Claude Opus 5.5 took 4 min 39 s and $0.63 at list price, Fugu Ultra v2 took 22 min 51 s and $4.66 at list price. Fugu Ultra v2 took 4.9× as long and cost 7.4× as much.
Claude Opus 5.5
Anthropic · $20.00/M out · 2,737 HN pts
Fugu Ultra v2
Sakana AI · $30.00/M out · 7 HN pts
Only Claude Opus 5.5 has CLI runs here (Claude Code).
Breakout
Make a Breakout game I can play right now with the keyboard or the mouse. Give it several levels, a score and some juice.
Specs and numbers
| Claude Opus 5.5 | Fugu Ultra v2 | |
|---|---|---|
| Maker | Anthropic | Sakana AI |
| Made in | US | Japan |
| Released | 22 Sep 2026 | 11 Sep 2026 |
| Price in, per M tokens | $4.00 | $5.00 |
| Price out, per M tokens | $20.00 | $30.00 |
| Context | 1,000,000 tokens | 1,000,000 tokens |
| Weights | closed | closed |
| Hacker News points | 2,737 | 7 |
| Time for the one prompt | 4 min 39 s | 22 min 51 s |
| List price of the one prompt | $0.63 | $4.66 |
Claude Opus 5.5 was cheaper: $4.03 less at list price. Claude Opus 5.5 was faster: 18 min 12 s less in total.
In the recording, both Breakout games play. Fugu Ultra v2 has no pelican: not run yet. Fugu Ultra v2 has no watch: not run yet. Fugu Ultra v2 has no landing page: not run yet. Fugu Ultra v2 has no logo: not run yet. Fugu Ultra v2 has no About page: not run yet.
Rebuild this screen experiment: Claude Opus 5.5's rebuild matched the screenshot at 89%; Fugu Ultra v2 was not in it. Tea Garden experiment: Claude Opus 5.5's game passed 5 of 5 checks; Fugu Ultra v2 was not in it.