Claude Haiku 4.5 vs. Opus 5.5 — which is better?

Quality: the answer is fairly clear

By the current QueryWise score, Claude Opus 5.5 is ahead: Claude Opus 5.5 ranks first with 9.9. Claude Haiku 4.5 is in 33 place with a score of 4.1. Claude Opus 5.5 is in 1 place with 9.9.

That does not mean Haiku 4.5 is a weak model. Its coding score is 7.6, and it scores 5.4 for reasoning. That is often enough for a short script, an obvious bug fix, or an explanation of a Python snippet. But Haiku needs closer supervision when a task involves a long chain of conditions.

Its overall result of 9.9, however, puts it above Haiku 4.5 in the current rankings. So the answer-quality winner is Claude Opus 5.5, not the cheaper model.

Price and speed: Haiku offers meaningful savings

An average question for Claude Haiku 4.5 costs around 10 ₸, compared with about 18 ₸ for Claude Opus 5.5. For a dozen requests, the difference is small. With hundreds of questions per month, it becomes a noticeable line item: Haiku is more cost-effective for recurring rough-draft work, while Opus is better when a missed detail would force you to redo the answer.

So claiming that one is definitely faster would be speculation. The pricing is known; speed telemetry is still being collected.

The practical choice looks like this: if you need several SQL query options quickly or want to rephrase an email to a client, the extra cost of Opus 5.5 is not always justified. When a question requires checking edge cases, comparing a large set of conditions, or carefully reviewing someone else’s code, Opus 5.5’s higher score is a sensible safety margin.

Context and task types

Claude Haiku 4.5 works with a context of 200K, while Claude Opus 5.5 supports 1M. For a normal message, a small file, or a single function, this does not determine the outcome. The difference becomes important when your prompt includes a long contract, several chapters of documentation, or a large project.

Consider a concrete task: reviewing a 200-page contract in one evening and finding every clause about penalties, deadlines, and termination. Opus 5.5 is preferable here because its larger context reduces the need to split the material into parts. Still, its conclusions should be checked against the original document—QueryWise is not a substitute for a lawyer.

The picture is less clear for coding. Haiku 4.5 has a score of 7.6, so it makes sense for local edits: writing a regular expression, explaining an error in a function, or adding a simple test. Choose Opus 5.5 when you need to understand several connected modules or design a change that affects the architecture.

There is also a learning use case. For a question like “Why does this algorithm return the wrong result for an empty array?”, Haiku can be a convenient, inexpensive first conversation partner. If the explanation becomes tangled across several cases, send the same request to Opus 5.5 and ask it to walk through the solution step by step. Answers from both models require expert review for medical, legal, and financial decisions.

Both models are available from Kazakhstan through QueryWise: payments are made in tenge, the interface is available in Russian and Kazakh, and new users receive 3 free questions. You can submit the same prompt to Claude Haiku 4.5 and Claude Opus 5.5 to see where their answers match and where one model adds unnecessary detail or misses a condition.

An honest verdict

Claude Opus 5.5 is ahead on the current score. If you need one primary assistant for complex analysis, long documents, and code with several interconnected parts, choose Claude Opus 5.5. It costs more, but its score of 9.9 versus 4.1 for Haiku 4.5 justifies the premium when checking the result again costs more than a few tenge.

Claude Haiku 4.5 wins in a different scenario: many inexpensive short requests, rough wording, and simple code fixes. At around 10 ₸ per average question, it is a better fit for a cost-conscious workflow. In short: for quality, choose Claude Opus 5.5; for price, choose Claude Haiku 4.5.