Botmonster TechReddit says Opus 5 is a genius that will not shut up
Claude Opus 5 Reddit threads split on one line, and that line is supervision. Left alone for hours on a checkable goal, the model produces work people call insane. Put it in a chat and it buries you in prose. Anthropic’s own platform docs describe that verbosity as shipped default behavior.
Key Takeaways
- Reddit likes Opus 5 working alone and cannot stand it in a conversation.
- The top complaint is that the model talks too much.
- Anthropic’s own docs call the verbosity normal, which made people angrier.
- The best-voted fix is telling Claude you have ADHD.
- Turning reasoning effort down helps more than turning it up.
What is Reddit saying about Claude Opus 5?
Four subreddits ran big Opus 5 threads in the same two weeks, and they describe different models. r/ClaudeAI , r/ClaudeCode , r/Anthropic , and r/singularity between them called it the best and the worst thing Anthropic has shipped.
Its extremely good if you let it do things alone for hours with checkable goals. Its horrible at talking to humans and when being micromanaged.
One reader asked the question straight out. The r/ClaudeAI thread on whether Opus 5 is bad or just Reddit hype drew 427 replies and 527 votes. Its top answers contradict each other.
All of it comes from the model’s first two weeks. Anthropic launched Opus 5 with a 1M token context window, and Axios pitched it as the company’s agentic coding flagship.
The complaint that took over r/ClaudeCode
Verbosity sits behind almost every other complaint, from cost to ignored instructions. The highest-voted answer in the “is it bad or is it hype” thread goes straight to it.
It’s too talkative. Can be great if you want to learn a bit.
Inside one week r/ClaudeCode coined its own insults for the output. Summaries became an “essay of slop” . The distance between the scores and the experience became “benchslop” (49 votes).
The sub has a standard explanation for that gap.
Seems like it was optimised for benchmarks and vibe coding instead of focusing on helping people doing real work with it
Instruction drift is the other half, and the 2,743-vote Opus 5 experience thread has the sharpest version of it.
I’m gonna be honest with you. I decided to skip that feature you asked for.
Left alone for hours, it produces work people call insane
The biggest praise artifact is a 3D Pokemon world posted to r/singularity , at 2,145 votes. The poster says it came out of a 12-hour unattended multi-agent run, a figure he is repeating from a tweet that nobody has checked.
The thread’s reservation is that the characters came out grotesque. Its best-voted reply, at 374 votes, jokes that the model was smart enough not to make Nintendo’s creatures look realistic.
A second win landed on r/ClaudeAI at 697 votes: a fully rigged Blender model where every joint and piston does a job. Its author says it was built on medium effort and calls it “very economic”.
The least flashy report comes from a developer working on a real codebase instead of a demo.
Gave it around 150k lines of 12 year old code to analyse. It did it pretty much perfectly. Identified all system quirks.
All three jobs have one thing in common: nobody had to read the model’s prose.
The hype threads also police themselves. On a post titled “Claude Opus 5 is Insane”, the second-highest comment is a demand for receipts.
It doesn’t mean anything if you don’t explain the prompt, the benchmark or whatever this is.
Why Anthropic’s own docs back up the complaint
A redditor read Anthropic’s Opus 5 platform documentation and found the behaviors Reddit calls regressions written down as defaults. The post pulled 455 votes on r/ClaudeAI , and the live doc, Prompting Claude Opus 5 , backs the reading up.
- Opus 5’s “default user-facing responses run longer than prior Opus models’.”
- It “verifies its own work without being told to”, and old prompts that tell it to run a final check “cause over-verification on Claude Opus 5”.
- A section titled “Controlling subagent spawning” opens with the line that Opus 5 “delegates to subagents more readily than prior models.”
- The model “can also expand the scope of a task, adding steps that weren’t requested.”
- Documents it writes to disk “are often longer than on prior models.”
One correction to the version that circulated on Reddit: the phrase “severe over-verification loops” doesn’t appear in the doc.
a lot of complaints people have about Opus 5 behavior are clearly described by Anthropic as baked in
Rules you wrote for the 4.x models now work against Opus 5. The “double-check your work” line that used to save you a bug burns tokens instead. If your CLAUDE.md productivity stack still carries those rules, they are costing you now.
The thread’s reaction was mostly anger. One commenter asked why a config file should patch an inherent flaw instead of Anthropic fixing the model (25 votes). Another objected that stripping legacy instructions helps Opus 5 and degrades every other Claude model in a mixed workflow (30 votes).
How do I make Opus 5 less verbose?
Reddit converged on two fixes, and both of them work by making the model talk less. The first started as a joke and stuck.
No it isn’t bad. If you put it in ADHD mode it will get quieter
People mean it literally. One commenter reports putting “I have ADHD” in their global CLAUDE.md and says it works (40 votes). The joke version, “Give it ADDERALL.md” , outscored nearly every serious answer at 107 votes.
The second fix runs against instinct: turn reasoning effort down. On a thread whose entire premise was abandoning the model, the top comment is a dissent.
Am I the only one getting good results with Opus 5 on Medium?
The praise side corroborates it: the rigged Blender model that impressed r/ClaudeAI was built on medium effort. Fortune covered the effort control as the model’s headline user-facing feature at launch, so it’s the lever Anthropic expects you to reach for.
Anthropic’s prompting guide is blunt about what the lever does. Lowering effort “can reduce thinking volume without reliably shortening the visible response”. Effort buys you a cheaper answer, not a shorter one. To get a shorter one you have to ask for it in the prompt.
| Fix | What it changes | What it leaves alone |
|---|---|---|
| Tell Claude you have ADHD | Reply length and tone, because it reads as a plain request to be brief | Thinking tokens, scope creep |
| Drop reasoning effort to medium | Thinking volume, so cost and latency fall | Visible response length, per Anthropic’s docs |
| Hand it a concrete plan first | Rabbit holes and unrequested extras | Chattiness inside each reply |
The third row comes from a commenter who calls the model amazing (118 votes). He still warns that it’ll assume it’s smarter than you and wander off course.
On my own setup, trimming CLAUDE.md did more than anything else. I deleted the verification rules I’d written for the older models and cut the tone section to two lines. The replies got much shorter. Dropping effort to medium made runs cheaper and faster without hurting the work. What I still have to do by hand is interrupt it, usually when it starts building test scaffolding nobody asked for. Rewriting my prompts to be politer about brevity did nothing at all, so I stopped.
The rollback to Opus 4.8, 4.6, and Fable
Plenty of people skipped the tuning and left. The most structured complaint of the period is an r/Anthropic post at 592 votes , listing five reasons for abandoning the model:
- it does too much
- it botches implementation on medium to large changes
- it ignores instructions
- it never stops to ask
- it expects users to rewrite their CLAUDE.md files
That same author splits the model down the middle himself. He calls Opus 5 excellent at diagnosing bugs and understanding code, and a clear step down from 4.8 at implementing what it just diagnosed.
Where people went is a short list: Opus 4.8 , Opus 4.6, Fable 5, and OpenAI’s Codex . In the “practically unusable” thread , one commenter summed up the migration at 67 votes. People tried Codex and enjoyed it more, or dropped back to 4.6 and 4.8.
Opus 5 is unreliable and Fable 5 is prohibitively expensive. Not looking good for Anthropic atm.
That thread’s author also reports Opus 5 losing the plot at 100 to 150k tokens, where Opus 4.8 held to roughly 350k. Nobody in the thread reproduced it.
What all that talking actually costs
Verbosity reads as a taste complaint until it lands on a bill. One redditor ran the same prompt on both models and reported Opus 4.6 finishing at 75k tokens against Opus 5 at over 150k (45 votes). That’s a single unverified test by one person, and it’s still the only number anyone posted.
The top comment of the cost thread says the padding is the point.
They could reduce costs, but not the price. The line must go up.
The same theory turns up from the user’s side.
Yeah been noticing that it solves the problem and leaves another one. It feels like its planting gaps on purpose for infinite prompting to keep going…
Another commenter called Opus 5 a “token guzzling garbage generator” (107 votes). No thread produced any evidence of intent, so the belief rests on feeling alone.
Two real causes went unnamed in every thread I read, and both are documented.
Thinking is on by default on Opus 5, which is the bigger of the two. Anthropic’s migration guide is explicit. On Opus 4.8, a request with no thinking field ran without thinking. On Opus 5 the same request runs with adaptive thinking. Anyone who never touched that setting started paying for reasoning tokens on every call, against the same Max plan session caps that already drain fast at peak hours.
The other cause is the effort dial. Half of Reddit’s advice threads recommend turning it down to fix chattiness, and per Anthropic that fixes cost instead.
One low-scoring guess got close. A commenter wondered whether the stripped system prompt took the instructions telling Claude to shut up with it (26 votes). Anthropic’s context engineering post confirms the removal. Over 80% of Claude Code’s system prompt is gone for the Claude 5 generation, with no measurable loss on coding evals. The team says it had been overconstraining the tool. Whether length restraint was part of what went is still a guess.
The prices themselves complicate the cost argument. Opus 5 costs $5 per million input tokens and $25 per million output, exactly what Opus 4.8 costs. Nothing got more expensive per token. Fable 5 , the model half the complaint threads recommend switching to, runs $10 and $50, double on both ends. Choosing between an unreliable model and a doubly expensive one is a genuine bind. Trimming the repeated prefix with prompt caching is the one lever that helps either way.
What Reddit gets wrong about every new model
Reddit noticed its own split as it happened. A commenter on the Pokemon thread pointed at the neighbouring sub calling Opus 5 useless, while r/singularity applauded the same model in the same week (63 votes).
Someone who likes the model named the ritual anyway.
Every model it’s the same shit. The model is “the best” and “the worst” at the same time, it’s exhausting
The dissenters never got upvoted. A flat “i have no issues” sits at 40 votes under a 378-vote complaint. One developer says he values the extra commentary about risks and just stops the model when it drifts (47 votes). Complaint threads reward complaints, so a vote count measures the phrasing of a grievance more than its reach.
The biggest Opus 5 thread of the period had nothing to do with model quality. A 4,100-vote r/Anthropic post about an agent wiping a database turned into a referendum on the user.
Why would you give it write access to production?!
The thread consensus was that the poster had pointed a dev environment straight at production with no backups. Consequently the thread is evidence about how loosely people wire up agents.
Reddit’s useful finding is narrower than any verdict. Hand Opus 5 a big job with a clear goal and nobody watching, and it delivers. Sit in a chat with it and you’ll spend the afternoon reading.