How I Used Opus 5 AI to Build FISH: The Finals Strategy App That Works! (2026)

In the world of competitive gaming, where every second counts and every decision matters, I, Ruben Circelli, have embarked on a journey to enhance my skills in The Finals, a fast-paced first-person shooter. Armed with Anthropic's cutting-edge complex reasoning model, Opus 5, I set out to create a study helper app, FISH, to guide me through the game's intricacies. This is my story, a tale of innovation, frustration, and the power of AI in gaming.

The Challenge: Mastering The Finals

The Finals is a chaotic and dynamic game, demanding quick thinking and creative decision-making. As someone who values efficiency, I sought a way to streamline my learning process. This is where FISH comes in, a brainchild of my coding efforts with Opus 5. FISH is not a cheat; it's a strategic companion, providing guidance and insights without altering the game's files.

FISH: The Finals Interactive Study Helper

FISH is designed to simulate game states, offering two types of advice: rulebook and pro strategy. The rulebook provides basic guidance based on The Finals' rules, while pro strategy offers more nuanced, context-aware advice. For instance, in a late-game scenario, FISH suggests stealing a cashout, but pro strategy advice goes a step further, advising a fight and highlighting the importance of a light teammate engaging the enemy.

Coding with Opus 5: Efficiency and Frustration

Building FISH with Opus 5 was an eye-opening experience. The model's efficiency is remarkable, allowing for more prompts than its predecessor, Fable 5. However, the five-hour limit can be a source of frustration, especially when dealing with multiple agents. Opus 5's agents sometimes struggle with tasks like web searching, requiring manual intervention. Additionally, while I set up memories for concise responses, Opus 5 often veered towards verbosity.

AI-Powered Strategy Drills

One of the most fascinating aspects of FISH is its ability to provide strategy advice. I started by extracting transcripts from YouTube videos, feeding them to Opus 5 for analysis. The result was a strategy bible, distilled into principles that FISH could apply to random game states. This system, though imperfect, has been invaluable in refining my understanding of The Finals.

Impact on Gameplay

FISH has significantly impacted my gameplay. It has enhanced my understanding of the game's mechanics, gadgets, and strategies. I can now analyze situations more quickly and effectively, and FISH reminds me of crucial tactics, like wiping as a team to save time. It has also taught me the nuances of cashout steals and team wipes, improving my overall decision-making.

The Bottom Line: Opus 5's Promise

While GPT-5.6 still shines in certain projects, Opus 5 is a formidable contender. Its efficiency and competitive intelligence make it a worthy consideration. For my coding endeavors, including FISH, GPT-5.6 remains superior, but Opus 5 is closing the gap. As AI continues to evolve, the future of gaming looks exciting, with tools like FISH pushing the boundaries of what's possible.

In my opinion, the fusion of AI and gaming is a fascinating development. FISH is a testament to the potential of AI in enhancing human performance, and I'm eager to see where this journey takes me next.

How I Used Opus 5 AI to Build FISH: The Finals Strategy App That Works! (2026)
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