Poe Claude Opus 4.5 Review 2026: Heavyweight Reasoning With a Thinking Budget

Claude Opus 4.5 is Anthropic’s top-tier model, and on Poe it is the bot you reach for when a problem is genuinely hard: deep reasoning, complex coding, and long-running tasks where a cheaper model would lose the thread. Its customizable thinking budget — you can dial how much reasoning effort it spends — is the standout feature for demanding work. It is overkill, and overpriced in compute points, for everyday questions that smaller models answer just as well.

Key features

Claude Opus 4.5 sits at the top of Anthropic’s Claude family: the model built for the hardest tasks rather than the fastest answers. On Poe it is presented as the deep-reasoning option, aimed at complex coding problems, multi-step analysis, and long-running tasks that require sustained coherence over many exchanges.

The signature capability is the customizable thinking budget. “Thinking” models spend extra computation reasoning through a problem before answering, and Opus 4.5 lets that budget be adjusted — more thinking for genuinely hard problems, less when you want a quicker, cheaper response. This is a meaningful control knob: it turns the cost-versus-quality tradeoff from a fixed property of the model into something you tune per task.

On Poe specifically, Opus 4.5 benefits from the platform’s multi-model context. Hard problems often need more than one kind of intelligence — reason through the architecture with Opus, generate supporting images with GPT-Image-1, draft the write-up with a fast writing model. Having the heavyweight reasoner one tab away from the rest of the stable makes Poe a credible workbench for serious knowledge work, not just casual chat.

Who it’s for

This bot is for people with genuinely difficult problems: software developers debugging complex systems or designing architectures, researchers working through multi-step analysis, writers structuring long or intricate pieces, and anyone whose task has failed on smaller models. If your prompt starts with “I’ve tried three models and none of them got this right,” Opus 4.5 is the escalation path.

It also suits the cost-conscious power user in a specific way. Because the thinking budget is adjustable, you can spend heavily on the one step that matters — the architectural decision, the tricky proof, the gnarly bug — and use cheaper models for everything around it. That’s a more sophisticated cost strategy than just subscribing to the most expensive model everywhere.

It is not for casual use. Simple questions, quick drafting, everyday Q&A — smaller, faster, cheaper models handle these identically well. Sending them to Opus 4.5 is like hiring a structural engineer to hang a picture frame.

What to watch out for

Compute cost is the big one. Top-tier models are the most expensive bots on Poe’s points economy, and a long session with a generous thinking budget can consume points at an alarming rate. This is by far the easiest bot on the platform to overspend on. Free-tier users will hit the daily wall quickly; even subscribers should keep an eye on the balance during heavy sessions.

The thinking budget is powerful but requires judgment. Set it too low and you lose the very reasoning advantage you came for; set it too high on routine subtasks and you burn points for no gain. There’s a learning curve to calibrating it — start conservative and raise it only when the problem genuinely resists.

Finally, remember that “best reasoning” doesn’t mean “always right.” Opus 4.5 can still hallucinate, still misread ambiguous requirements, and still produce confident-sounding wrong answers on topics outside its training. For high-stakes outputs — code going to production, analysis going to clients — verification remains your job, not the model’s.

Pricing

Available on Poe’s free tier with a daily compute-points allowance, though heavyweight models consume points fastest. The paid subscription is $19.99 per month (1 million compute points) or $199.99 per year. Check Poe’s current per-model point rates — Opus-class models cost more per use than smaller ones.

Pros

• Anthropic’s top-tier model for deep reasoning, complex coding, and long-running tasks.
• Customizable thinking budget lets you tune reasoning effort — and cost — per task.
• Strong escalation path when smaller models fail on hard problems.
• Sits inside Poe’s multi-model workbench, pairable with image, writing, and fast models.

Cons

• The most expensive class of bot on Poe’s compute-points economy — easy to overspend.
• Overkill for everyday questions; smaller models match it on routine tasks for far fewer points.
• Thinking-budget calibration takes practice; misjudge it and you waste the advantage or the points.
• Still capable of confident wrong answers — high-stakes outputs need human verification.

Frequently asked questions

What is Claude Opus 4.5 on Poe?

It is Anthropic’s Claude Opus 4.5 — the top tier of the Claude model family — offered as a bot on Quora’s Poe platform. It is built for deep reasoning, complex coding, and long-running tasks, with a customizable thinking budget.

What is a thinking budget?

Thinking models spend extra computation reasoning through a problem before answering. The thinking budget controls how much of that effort the model uses — more for harder problems, less for quicker and cheaper responses. Opus 4.5 lets you adjust it.

When should I use Opus 4.5 instead of a cheaper model?

When the problem is genuinely hard: complex code, multi-step analysis, or tasks where smaller models have already failed. For routine questions and drafting, cheaper models give the same result for far fewer compute points.

How much does it cost to use?

It runs on Poe’s compute points, and top-tier models consume them fastest. It’s available on the free tier’s daily allowance, but serious use wants the $19.99/month subscription (1 million compute points) or $199.99/year — and even then, heavy sessions deserve monitoring.