Hardest reasoning tasks
Choose Claude Fable 5.1
Claude Fable 5.1 scores 53.4 on the Artificial Analysis Intelligence Index, against 45.4 for Qwen3.8-Max.
Claude Fable 5.1 vs Qwen3.8-Max: price, context and capabilities
Choose Claude Fable 5.1 for the hardest reasoning tasks and reasoning over long documents; on the other points the two are level or the data is missing.
In short
- A price comparison is not possible: one of them has no comparable published price.
- Only Claude Fable 5.1 offers structured output, prompt caching, batch api.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Reasoning over long documents
Choose Claude Fable 5.1
Claude Fable 5.1 scores 85.3% on Long-context reasoning (AA-LCR), against 80.3% for Qwen3.8-Max.
Specifications side by side
| Claude Fable 5.1 | Qwen3.8-Max | |
|---|---|---|
| Provider | Anthropic | Alibaba Cloud (Qwen) |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $20.00 / 1M tokens | No data |
| Input | $10.00 / 1M tokens | No data |
| Output | $50.00 / 1M tokens | No data |
| Cached input | $0.25 / 1M tokens | No data |
| Context window | 1M | No data |
| Max output | 128k | No data |
| Released | September 2026 | Sep 2, 2026 |
| Knowledge cutoff | June 2026 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling |
| API model id | claude-fable-5-1 | qwen3.8-max |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Fable 5.1 | Qwen3.8-Max |
|---|---|---|
| Intelligence Index | 53.4 | 45.4 |
| SciCode | 63.1% | 52.1% |
| GPQA Diamond | 93.7% | 92.8% |
| Humanity's Last Exam | 59.1% | 43.1% |
| Long-context reasoning (AA-LCR) | 85.3% | 80.3% |
| MMMU-Pro (visual reasoning) | No data | 82.8% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Claude Fable 5.1 or Qwen3.8-Max?
Choose Claude Fable 5.1 for the hardest reasoning tasks and reasoning over long documents; on the other points the two are level or the data is missing.
Which is cheaper, Claude Fable 5.1 or Qwen3.8-Max?
A price comparison is not possible: one of them has no comparable published price.
What is the difference between Claude Fable 5.1 and Qwen3.8-Max?
Claude Fable 5.1 is made by Anthropic and Qwen3.8-Max by Alibaba Cloud (Qwen). A price comparison is not possible: one of them has no comparable published price. Only Claude Fable 5.1 offers structured output, prompt caching, batch api.