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claude-fable-5vsclaude-opus-5Both are available on APICLAN through one OpenAI-compatible endpoint, so switching between them is a one-word change. Here is what each actually costs you, and how much the difference is worth at your volume.
claude-opus-5 runs about
50% cheaper than claude-fable-5. Both models are from
the same family.Percentages are easy to shrug off. Put your real monthly volume in and see the number in dollars.
We do not publish capability benchmarks, and you should be sceptical of anyone who does. Scores on public benchmarks rarely predict how a model behaves on your codebase, your prompts and your edge cases.
What we can tell you is exactly what each one costs. Run both against a real task from your own workload — switching takes one word — and let the cheaper one win unless it visibly fails.
A practical approach that works well in agent loops: route the bulk of calls to the cheaper model, and escalate to the more expensive one only when the first attempt fails a check. Most workloads are dominated by routine calls, so the blended cost lands close to the cheap model rather than the expensive one.
Same endpoint, same key, same request shape. Only the model string changes.
- model="claude-fable-5",
+ model="claude-opus-5",If you have not connected yet, the quickstart takes about thirty seconds — you change your base URL and nothing else.
Prices verified 2026-08-24 and regenerated automatically from live billing data. List prices change; this page follows them.