Anthropic
Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
Claude Fable 5 is a Mythos-class model with robust safeguards. It can handle long-running, complex, and asynchronous tasks where previous models would have needed more frequent check-ins.
Introducing Claude OpusModel Snapshot
TypeLanguage
ReleaseJul 1, 2026
Context1,000,000
Tagsreasoning, tool-use, explicit-caching, file-input
Overall
Rank #4 across 600
59.9
Coding
Rank #8 across 266
76.5
Blended Price
Rank #368 across 379
$20.00/M
Strength Profile
Percentile score by analysis domain.
* Cost is inverted: lower input, output, and blended prices rank higher.
Benchmark Percentiles
Higher bars mean stronger relative placement.
Model Details
Runtime
Output Speed59.9 tok/s
First Token61.86s
Max Output128,000
Pricing
Blended$20.00/M
Input$10.00/M
All Benchmarks
| Metric | Domain | Value | Rank |
|---|---|---|---|
| Artificial Analysis Intelligence Index | overall | 59.9 | #4 |
| Artificial Analysis Coding Index | coding | 76.5 | #8 |
| LiveBench Mathematics | math | 96.0% | #2 |
| GPQA | reasoning | 92.6% | #14 |