Claude Sonnet 5.5 vs. Opus 5.5 — Which Is Better?

Quality: Opus leads on the current score

In the QueryWise rankings, Claude Opus 5.5 is in 1 place with a score of 9.9 out of 10. Claude Sonnet 5.5 ranks 2 and scores 9.7 out of 10. By the current score, Claude Opus 5.5 is ahead. The ranking leader remains Claude Opus 5.5 with a result of 9.9.

The gap between the models is small, but that does not make them interchangeable. For a simple question, both usually produce similar results: explaining a term, rewriting an email, or outlining an article. On long and ambiguous prompts, Opus’s extra precision is more noticeable. It is better at maintaining constraints and less likely to reduce an answer to generic advice.

We ran both models through real-world questions. For example: “Compare two versions of a supply agreement from the buyer’s perspective, identify disputed clauses, and suggest amendment wording without attributing conditions to the document that are not actually there.” Opus is more careful about separating what the text explicitly says from its own recommendations. Sonnet performs well too, but in a long contract it is more likely to smooth over an important caveat. That is a meaningful difference for legal documents, although neither response should be treated as legal advice.

These figures should be considered alongside the overall score: they do not guarantee one universal winner for every task.

Price and speed: Sonnet’s savings are immediate

An average question to Claude Sonnet 5.5 costs about 10 ₸. The equivalent request to Claude Opus 5.5 costs approximately 18 ₸. In other words, Opus requires a noticeably larger budget per answer. If you need to process several dozen short emails, instructions, or text fragments in a day, Sonnet looks like the more sensible option.

QueryWise does not yet have enough data for median speed: the figure is listed as — for Sonnet and — for Opus. It would therefore be misleading to promise that one model is faster than the other. The practical takeaway is different: with the same number of requests, Sonnet’s savings are clear in advance, while any time advantage has not yet been confirmed by measurements.

Both models are available in QueryWise from Kazakhstan: payments are processed in tenge, the interface is available in Russian and Kazakh, and new users receive three free questions. It is a convenient way to test both models on your own materials without buying a separate Anthropic subscription.

Context and task types

Claude Opus 5.5 has a stated context window of 1M. For Sonnet, the current QueryWise data lists this figure as 1M. A large context is especially useful when a prompt involves extensive source material—for example, finding contradictions across several sections of a policy, matching a table with an appendix, or reviewing a large project document.

Sonnet is a better fit for recurring work where requests are frequent and the cost of each individual mistake is moderate. Ask it to prepare ten product-description variants in an evening, bring a Kazakh text into a neutral style, or explain a difficult topic to a school student through an everyday example. For tasks like these, paying extra for Opus often does not deliver a proportional benefit.

Choose Opus when many conditions need to be connected in a single answer. Examples include reviewing a service architecture with multiple dependencies, analyzing a company’s financial model, or preparing a detailed database migration plan. The model does not remove the need to verify calculations and sources, but it is better suited to a first serious pass through complex material.

In QueryWise, you can run both models side by side and see where they agree. If Sonnet and Opus identify the same risk in a contract or find the same bug in code, confidence increases. If their answers diverge, it is more useful to check the source data than simply choose the response with the more confident tone.

Verdict for Kazakhstan

For complex analysis, long documents, and tasks where mistakes are costly, the current-data winner is Claude Opus 5.5, namely Claude Opus 5.5. Its score is 9.9, while its 1M context makes it better suited to large bodies of material.

For frequent everyday requests and a limited budget, the choice is different: Claude Sonnet 5.5. At about 10 ₸ per average question, it is noticeably more affordable, while its current result of 9.7 remains very high. It is a good option when you need a quick draft, explanation, or several workable ideas without continually paying Opus-level prices.

My conclusion is simple: choose Opus for quality on difficult tasks and Sonnet for efficiency in everyday work. The QueryWise ranking changes every hour, so the final lead is shown by Claude Opus 5.5 with a value of Claude Opus 5.5.