Author Builds FISH App for The Finals With Opus 5, Citing $100 Plan Limits

3 articles · Updated · PCMag · Aug 15

FISH uses Anthropic’s Opus 5 to generate The Finals practice drills, simulated match states and memorization quizzes, aiming to speed up strategy learning without interacting with the game itself.
Around 70 strategy principles power its advice system: basic “rulebook” guidance comes from game mechanics, while “pro strategy” recommendations were distilled from transcripts of hundreds of YouTube guides.
The author said Opus 5 handled complex coding tasks well—such as building simulations, maps and dynamic advice—but often struggled with web extraction, memory instructions and uneven agent behavior.
Claude’s Max 5x plan costs $100 a month, and its five-hour usage limits became a key frustration because Opus 5 could launch 10 or 20 agents at once and burn through the window quickly.
After a week of use, the app improved recall of maps, gadgets and tactics, while the broader takeaway was that Opus 5 has narrowed the gap with GPT-5.6 even if OpenAI still led for this project.