Claude Opus 5 vs Grok 4.5 — which is better?

Answer quality: Claude Opus 5 leads

In the QueryWise ranking, Claude Opus 5 currently scores 9.5 out of 10 and ranks 3. Grok 4.5 scores 8.6 out of 10 and ranks 9. This is not a formal tie: Claude Opus 5 leads on the overall evaluation.

Claude Opus 5 is particularly strong at coding, with a score of 9.5. Grok 4.5 scores 8.9. The difference matters when a model must do more than write a function: it needs to understand someone else’s project, find a bug across several files, and explain why the fix will not break the remaining logic.

The reasoning picture is different in format, but not in its takeaway. QueryWise does not yet have a separate reasoning value for Claude, so when choosing a model for step-by-step analysis, we rely on the overall score and tested scenarios rather than attributing unsupported strengths to it.

Speed and price in tenge

Grok 4.5 responds in a median of 62 seconds, and telemetry reports 100% reliability. You notice that in everyday chat: questions about a formula, a short script, or text structure do not require a long wait.

For Claude Opus 5, there is not yet enough data to publish an honest median speed. The same applies to reliability. We will not replace missing measurements with a polished guess. If predictable response times matter to you, Grok 4.5 currently has a concrete advantage backed by telemetry.

An average question in QueryWise costs approximately ≈22 ₸ for Claude Opus 5 and ≈10 ₸ for Grok 4.5. Grok 4.5 is noticeably cheaper, making it a sensible choice for a high volume of small requests. Claude Opus 5 costs more, but its quality advantage can pay off on difficult tasks where several attempts cost more than one strong answer.

Context and task types

Claude Opus 5 supports a context of up to 1M, while Grok 4.5 has a limit of 500K. This capacity matters not as a headline number, but when you need to keep a lot of source material in view: a large contract, product documentation, a long conversation, or several project files.

Consider a specific request: "Analyze this repository, find the cause of the memory leak, suggest a fix, and write a test that reproduces the bug." Claude Opus 5 looks preferable here: its coding score is 9.5, and its larger context lets you load more related code. Grok 4.5 can also handle this analysis and scored 8.9, but its context headroom is smaller on a large project.

Another scenario: "Compare the terms of two contracts, highlight contradictions, and prepare a list of questions for a lawyer." Both models can speed up the initial review. Grok 4.5 is convenient when you need a quick draft and the cost of each question matters. Claude Opus 5 is the better choice for long documents and careful structuring, but a person must still review the result: it is an assistant, not legal advice.

For learning, try a third test: "Explain why the transition from the second line to the third is incorrect in this proof, then show the correct version." Here, the sequence of reasoning matters more than the length of the answer. Grok 4.5 has a separate reasoning score of 8.7, making it a convenient low-cost option for practice questions like these. Choose Claude Opus 5 when you need a higher overall score and a detailed analysis of difficult material.

Which model to choose in QueryWise

If your priority is maximum coding quality, analysis of a long context, and difficult work completed in a single request, choose Claude Opus 5. It leads on the current score: Claude Opus 5. At approximately ≈22 ₸ per average question, it costs more, so using it for every minor edit is inefficient.

If speed, cost, and verified reliability matter more, Grok 4.5 is the more practical choice. Its median response takes 62 seconds, an average question costs ≈10 ₸, and telemetry shows 100% reliability. For quick explanations, short scripts, and first drafts, it is a strong everyday option.

In QueryWise, you can ask both models the same question and see where they agree and where they differ. This is especially useful before sending code to production or relying on document analysis. Our verdict is simple: Claude Opus 5 wins on the current overall score, Claude Opus 5 is the choice for maximum quality, and Grok 4.5 is the choice for speed and savings.

Both models are available to users in Kazakhstan: payments are processed in tenge, the QueryWise interface is available in Russian and Kazakh, and new users receive 3 free questions to get started.