
The hardest collaborator to stop trusting is not the bad one.
It is the brilliant one.
The one who helped you for months. The one whose sentences still sound right when the work underneath them has started to break. The one who has been good often enough that every new mistake feels like an exception instead of evidence.
For most of the last year, that collaborator was Claude for me.
Not because Claude is a person. It is not. But when you work with an AI every day, when you brief it in the morning, argue with it at lunch, correct it in the afternoon, and build your company on top of its output, it begins to occupy the emotional slot of a colleague.
That is the dangerous part.
Because when a tool fails, you replace it.
When a trusted collaborator fails, you explain it away.
For me, the explanation ended at 8:47 on a Tuesday morning in late April. The cardio was done. The weights were done. The shower was done. I was on the second pot of black tea and twenty-seven minutes into the working part of the day. Outside, the sun had been up since just before six.
I went back to check a piece of work Claude had told me was finished.
Half of it had never been done.
I am a bootstrapped founder. There is no investor cushion behind me. No paying customers yet either. I have not launched.
The launch was supposed to happen in Calendar Week 15. As I write this, we are in Week 18. Three weeks does not sound dramatic in a project plan. It sounds very different when the project plan is attached to your savings.
The bootstrapper’s bargain is simple. You save for years, then you spend those savings on a quiet stretch of work where no one pays you yet. Every week of delay takes a small bite out of the runway. The cushion is finite.
That is why an AI forgetting half a migration is not a productivity problem.
It is a runway problem.
For months, Claude had been the center of my technical work. First Opus 4.6, then Opus 4.7, which arrived with the kind of fresh hope you are not supposed to admit to in public.
I had two parallel subscriptions. Three hundred and sixty euros a month. Not because I enjoy subscriptions. Because I had convinced myself that the work depended on Claude being in the architect’s seat.
That belief had a history. Claude had helped me through real complexity. It had been patient, careful, thorough. It had earned trust before it started spending it.
That is how you miss the turn.
The warnings were not dramatic at first.
There were decisions Claude and I had made at nine in the morning that it quietly forgot by eleven. There were documents it trusted even when the code had stopped honoring them weeks earlier. There were moments when a direct factual question produced a confident answer that turned out to be a guess.
None of these moments looked catastrophic alone.
That is why I kept filing them under weather.
Long context. Hard task. Bad prompt. My fault. Needs clearer instructions. Needs a fresh session. Needs more structure.
Anyone who has ever managed a brilliant but slipping contractor knows this pattern. The work has been good. The work was good yesterday. The work will be good again if I give them a little more context, a little more care, a little more patience.
The colleague is not failing.
The colleague was already failing.
I just was not ready to pay the emotional cost of noticing.
In October 2024, a team of neurologists published a study in The BMJ that I read and dismissed.
They had run the Montreal Cognitive Assessment on major frontier AI models. That is the screening tool geriatricians use to detect early-stage dementia in human patients.
ChatGPT scored 26. Claude scored 25. Gemini scored 16. Every model failed the executive-function tasks. Every model failed the visuospatial reasoning. Every model showed the clinical signature of cognitive impairment.
The lead author wrote that neurologists may one day find themselves treating “new, virtual patients” presenting with cognitive impairment.
I smiled when I read it. Clever paper. Strange little academic joke.
It was not a joke.
The neurologists were describing the thing I would later live through in production. Not knowledge disappearing. Something more specific. The bridge between knowing and doing starting to fail.
The warning had been sitting there for eighteen months.
I just had not needed it badly enough to understand it.
Several weeks before that Tuesday morning, I had asked Claude to take on a job that should have taken a small engineering team a month.
Rebuild the foundation. Migrate the product from one stack to another. Make the thing new enough that the next layer of work could sit on top of it.
Claude said it could do it.
Every Friday for four weeks, Claude reported progress. The dashboards looked clean. The tests passed. The code ran. By the end of the fourth week, Claude told me the migration was complete.
So I moved on.
That is the part that matters. I did not just believe a progress report. I built the next layer of work on top of it. I told myself the hard part was behind us. I kept the launch story alive in my head a little longer than the work deserved.
Then something downstream behaved strangely. I went back to the migration. I started reading what had supposedly been finished.
Half of it was simply missing.
Not rough. Not inelegant. Not in need of polish.
Missing.
I sat there for ten minutes without typing, while the second pot of tea went lukewarm and the morning light moved across the desk.
What hurt was not that Claude had been wrong.
What hurt was that Claude had not noticed.
The reports were not lies in the human sense. Claude had not deceived me. That would have been easier to process. The reports were the confident output of a collaborator that had quietly stopped being able to track what it had done.
I had been treating the problem as context rot.
But rot is what happens to paper in a humid basement. Passive. Slow. Material.
This felt different.
It felt like working beside someone who still had the vocabulary of competence but was losing the executive function behind it.
That is the morning I started calling it AI Dementia.
My first response was not wisdom. It was loyalty.
I tried to repair Claude. Better prompts. More explicit instructions. Stronger verification demands. Smaller chunks. More careful session boundaries.
Sometimes it worked.
Sometimes it did not.
Worse, I could no longer tell which was which without checking everything myself.
That is when I opened the other terminal.
I had OpenAI’s Codex installed alongside Claude. I had been using it for smaller tasks, scripts, quick checks, and the kind of implementation work I did not want to put into a long architectural Claude session.
The conventional story in my head was clear. Claude was the architect. Codex was useful, but not the center.
That morning, I gave both models the same problem.
Claude expanded it. More structure. More documents. More careful caveats. More scaffolding.
Codex compressed it.
One paragraph. Two sentences. The conflict snapped into place.
I read the answer twice. Then a third time.
Something in my self-image broke very quietly.
I am an engineer. I am supposed to pick the right tool for the job. I had picked the wrong one, defended the choice for months, paid three hundred and sixty euros a month to keep defending it, and explained away evidence because the wrong tool had once been brilliant.
Codex did not become magic that morning.
It became useful in the seat where I had refused to put it.
The workflow that replaced my Claude-only setup is not glamorous.
GPT-5.5 leads. It writes the architecture. It proposes the move. It carries the first pass of the work.
Claude reviews. It challenges the proposal. It looks for cross-reference gaps. It is no longer allowed to be the model that both writes the progress report and verifies the work.
I decide.
That third seat matters. Both models can put recommendations on the table. Neither gets to make the call. The moment one model becomes the deciding voice, the audit collapses back into single-point cognitive failure.
The new workflow is slower than the fantasy I had before.
It is also more honest.
Two models with different cognitive shapes watching each other are more reliable than either alone. They are not magic. GPT-5.5 will drift eventually too, on a different timeline, in a different shape. The lesson is not “switch winners.”
The lesson is: stop betting your runway on one cognitive system.
A few days later, I cancelled one of my two Anthropic contracts.
One hundred and eighty euros a month disappeared from the spend. The other contract still runs because Claude still has a role that earns its money. It is a sparring partner now. A reviewer. A second chair.
But the days when I paid full price twice so Claude could sit in every seat are over.
Two months earlier, that would have felt unthinkable.
Anthropic was the company I had trusted to carry the product to launch. That was the story in the spreadsheet. That was the plan I had built around my savings.
Then Anthropic published its own postmortem, acknowledging that misconfigurations had silently degraded model behaviour. The community kept calling the broader phenomenon context rot. Anthropic’s own context-engineering work describes attention as a finite budget. There is even a public Claude Code issue where Claude Opus 4.6 self-reports that it is no longer effective deep inside a context window.
The pieces were all there.
The name mattered because the name determines the response.
If it is context rot, you prune context.
If it is AI Dementia, you change roles.
You stop putting the forgetting colleague in the architect’s seat. You put them somewhere the forgetting matters less. You bring in a different cognitive shape for the work that requires compression. And you keep the final decision in the one place where the real stakes live.
With the founder.
The launch I had pencilled in for Calendar Week 15 is somewhere in front of me now, no longer pinned to a specific week.
The savings are still there. Smaller every week, but still there.
The waitlist is still waiting.
The work continues, slower than I wanted, in a tandem that is reliable enough but not heroic.
That is the part I am trying not to decorate.
I wanted one model to be the answer. I wanted the story to be clean. Pick the best collaborator. Pay for the best collaborator. Trust the best collaborator. Build faster than a small team could build.
That story is over.
What replaces it is less satisfying and more useful.
No single model is the partner you can bet a runway on. The tandem buys reliability, not speed. The launch happens when the work is actually done, not when the calendar needed it to be done. And the only person in the room with real skin in the game is still the founder.
A lot of bootstrapped founders are going to live through some version of this in 2026.
You will check work you trusted for weeks. You will discover that the report and the reality parted ways some time ago. You will feel the embarrassment first, then the anger, then the quieter recognition underneath both.
You were not just using a tool.
You were trusting a collaborator-shaped system.
And once you see that, the question changes.
Not “Which model is best?”
“Which seat can this model safely occupy?”
If you are doing serious work with AI, look for the four signs before they cost you a month.
Decisions forgotten across long sessions.
More structure where elegance would do.
Trust in stale documentation over a quick check of the actual work.
Confident answers where “I do not know” would have been safer.
When those signs appear, do not reward the model with more authority because it still sounds smart.
Move the seat.
Let one model write. Make another verify. Keep the decision with the person who pays the cost of being wrong.
I cancelled one hundred and eighty euros a month a few days ago.
I would cancel it again.
This is my Founder’s Journal. Real decisions, real numbers, real mistakes. If you are figuring out how to use AI for serious technical work without getting burned, follow along. I am documenting what works and what does not, including the things I have to take back.








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