Claude Fable 5 vs Claude Opus 5 on HealthBench Professional
updated August 16, 2026
Claude Fable 5 scores 0.660 to Claude Opus 5's 0.598, a gap of 0.062 on the 525 physician-graded tasks of HealthBench Professional. The table below puts the scores next to what each model costs to actually run.
Side by side
 Claude Fable 5 | Claude Opus 5 | |
|---|---|---|
| score | 0.660 | 0.598 |
| rank | 1 of 9 | 3 of 9 |
| context window | 1.0M | 1.0M |
| price per 1M tokens, in / out | $10.00 / $50.00 | $5.00 / $25.00 |
| 1,000 consult exchanges | $55.00 | $27.50 |
| released | 2026-06-09 | 2026-07-24 |
| license | proprietary | proprietary |
Consult exchange: 2,000 input and 700 output tokens, priced at list rates as of August 16, 2026. GPT-5.6 models charge higher rates above 272K input tokens. MAI-Thinking-1 is in public preview on Microsoft Foundry without final list pricing.
Reading this pairing
The question this pairing answers is whether Anthropic's top tier is worth double the price of its workhorse. On this benchmark the answer is measurable: 0.062, for 2x the input rate and 2x the output rate. Opus 5 already sits above every OpenAI model except Sol, so Fable 5 is the choice when the workload justifies paying twice for the hardest cases, not the default.
Which scores higher on HealthBench Professional, Claude Fable 5 or Claude Opus 5?
Claude Fable 5 scores higher: 0.660 against Claude Opus 5's 0.598, a difference of 0.062 on the 525-task set, as of August 16, 2026.
Which is cheaper to run, Claude Fable 5 or Claude Opus 5?
Claude Opus 5. 1,000 typical consult exchanges (2,000 input and 700 output tokens each) cost $27.50 against $55.00 at list rates.
Related comparisons
- 0.660 vs 0.605
- 0.605 vs 0.598
- 0.598 vs 0.558
Full results for both models: Claude Fable 5 and Claude Opus 5. The complete score-difference matrix is on the compare page.