GPT-OSS 120B vs Claude Fable 5: Which Is Better in 2026?

We added GPT-OSS 120B to QueryWise on release day and immediately compared it with Claude Fable 5 on ordinary user requests. One model leans toward reasoning and efficiency, while the other is noticeably more confident at handling a complex task from start to finish. This comparison is based on the QueryWise rating and current data updated every hour.

Quality: the gap is noticeable

GPT-OSS 120B currently scores 5.2 out of 10 and ranks 22 in the QueryWise leaderboard. Claude Fable 5 scores 9.8 out of 10 and ranks 1. Claude Fable 5 is ahead by the current score, so it is the better choice when you need a highly consistent answer with minimal editing.

The difference is especially clear in specific tasks. GPT-OSS 120B scores 5.1 in coding, while Claude Fable 5 scores 9.8. For generating working code, finding bugs in a large file, and explaining someone else’s project, Claude Fable 5 currently has the edge.

The picture is slightly different for reasoning: GPT-OSS 120B scores 9.9, while Claude Fable 5 scores 9.5. GPT-OSS 120B may be a good choice for logical chains, analyzing conditions, and tasks where the structure of the reasoning matters. But a strong result in one category does not change the overall picture: Claude Fable 5 leads by the combined score.

Speed and price in tenge

Claude Fable 5 has a median speed of 30 seconds in QueryWise telemetry. There is not yet enough data on the median speed of GPT-OSS 120B, so assigning it a specific time would be misleading. Claude does not always respond instantly, but its latency has already been measured on real requests.

An average question costs about 10 ₸ with GPT-OSS 120B and about 43 ₸ with Claude Fable 5. For occasional complex requests, the difference may not matter much. But if you ask for text rewrites, code checks, or summaries every day, the more expensive Claude will quickly increase your costs.

My practical verdict on price is simple: GPT-OSS 120B is better for drafts, high-volume short requests, and experimentation. Claude Fable 5 is worth the price when a mistake would cost more than a few dozen tenge—for example, when analyzing a large technical brief or preparing for an important presentation. These are assistants, not medical, legal, or financial advisers: you should verify final decisions yourself.

Context and task types

GPT-OSS 120B has a context of 131K, while Claude Fable 5 has 1M. Claude’s large context window is useful when you need to load a long contract, several textbook chapters, a chat history, or a large repository into one request. The model can connect details that would otherwise have to be split across several messages.

GPT-OSS 120B makes more sense for short and medium-sized tasks: explaining a formula, working through a condition step by step, outlining an SQL query, or checking an algorithm idea. If the answer needs further editing, the lower price makes that workflow less painful.

Claude Fable 5 looks stronger in scenarios that require a finished result: reviewing several files, turning a long source into a clean summary, or finding contradictions in product requirements. Still, a larger context window does not guarantee perfect accuracy. The model can miss details, especially when the source data is poorly organized.

In QueryWise, you can send the same request to both models and see where they agree and where they differ. That is more useful than choosing blindly by name: a strong answer from one model can help you spot an omission in the other.

An honest verdict

The winner by the current overall score is Claude Fable 5. For programming and complex work tasks, choose the model with the higher current result in the relevant category; Claude Fable 5 currently leads in coding with 9.8 versus 5.1 for its rival. The reasoning comparison is closer: GPT-OSS 120B scores 9.9, while Claude Fable 5 scores 9.5.

If you need one primary assistant for code, long documents, and tasks where reliability matters, my choice is Claude Fable 5. If price, short questions, and the ability to run several options cheaply matter most, choose GPT-OSS 120B. It may not top the leaderboard, but it could be easier on your wallet.

Both models are available in QueryWise from Kazakhstan: payments are made in tenge, the interface is available in Russian and Kazakh, and new users get three free questions at the start. That is enough to test your own workflows rather than taking a marketing promise on faith.