GPT-OSS 120B or Claude Opus 5.5 — which is better?

Quality: Claude Opus 5.5 leads for now

In the QueryWise ranking, GPT-OSS 120B is in 35 place with a score of 3.7 out of 10. Claude Opus 5.5 is in 1 place with a score of 9.9. Claude Opus 5.5 is ahead on the current score, while Claude Opus 5.5 remains the overall QueryWise leader with 9.9.

The difference shows up not in the model names, but in how they handle difficult prompts. GPT-OSS 120B is particularly interesting when a task requires reasoning: its current score in that dimension is 9.9. Its coding score is 5.0. QueryWise displays them side by side, so the overall score does not hide each model’s profile.

Our practical takeaway is simple: GPT-OSS 120B looks like a budget-friendly option for tasks that depend on a consistent, step-by-step analysis of conditions. Claude Opus 5.5 is the safer choice when an error in one intermediate step could ruin the entire result. This is not medical, legal, or financial advice: documents in those fields should still be reviewed by a qualified professional.

Speed and pricing in tenge

The median response speed for GPT-OSS 120B has not collected enough data yet: QueryWise currently lists it as — tokens. There is also not enough telemetry for Claude Opus 5.5, so an honest comparison of wait times is not yet possible. Calling one model faster than the other without measurements would be guesswork.

The price difference is clearer. An average question to GPT-OSS 120B costs about 10 ₸, while a question to Claude Opus 5.5 costs about 18 ₸. Pricing changes with QueryWise’s live data, but the choice is already clear: for dozens of short prompts, GPT-OSS 120B is easier on the budget. When one answer replaces a lengthy manual review or several iterations, the premium for Claude Opus 5.5 may pay for itself in saved time.

Both models are available in QueryWise in Kazakhstan: payments are made in tenge, the interface is available in Russian and Kazakh, and new users receive three free questions to start. QueryWise runs them side by side, so you can see where they agree and where one model goes off in a different direction.

Context and task types

For long materials, Claude Opus 5.5 has more room to work with: its context window is 1M. GPT-OSS 120B has a context window of 131K. For an ordinary question, the difference is not critical, but Claude’s extra capacity becomes noticeable when analyzing a large archive, technical documentation, or several contracts.

Consider a specific prompt: “Compare the early-termination terms across these 180 pages of a contract and identify the clauses that contradict one another.” Claude Opus 5.5 is the more logical first choice: its larger context reduces the need to split the file into sections. GPT-OSS 120B can handle it too if the document is supplied in blocks, but that workflow is less convenient.

Here is another scenario: “Explain why this algorithm produces an incorrect result for repeated values, then suggest a fix.” GPT-OSS 120B deserves consideration here because of its strong reasoning score of 9.9 and low average price. But if the prompt grows into a large project with several files, tests, and a long change history, Claude Opus 5.5 gains a practical advantage from its 1M context.

For learning, the better choice depends on the format. When analyzing one topic and asking for an explanation of a mistake, GPT-OSS 120B may be the sensible option. When preparing notes from a large course and connecting definitions across different chapters, Claude Opus 5.5 is more convenient. Facts still need to be checked: a confident tone does not turn a model into a source of truth.

An honest verdict

For quality on difficult, long-running tasks, the current winner is Claude Opus 5.5: Claude Opus 5.5 is ahead on the current score. For large documents, the choice leans toward Claude Opus 5.5 thanks to its 1M context. For saving money on regular questions, GPT-OSS 120B wins at around 10 ₸ versus approximately 18 ₸ for Claude Opus 5.5.

If you need one all-purpose option and budget is secondary, choose Claude Opus 5.5. If you want an affordable way to work through questions where the chain of reasoning matters, start with GPT-OSS 120B. In QueryWise, it makes sense to give the same difficult prompt to both models: their side-by-side answers quickly show where they agree and where manual checking is needed.