Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
Intelligence
64.9
#1/529
Coding
62
#1/435
Math
—
Speed
—
Pricing
—
Claude Fable 5 is Anthropic’s model designed for adaptive reasoning and high-effort tasks. It processes at 0 tokens per second and is priced at $0 per million tokens, targeting professional users.
When to Use Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
✓ Best For
- Complex problem-solving tasks.
- Data analysis and interpretation.
- Software development and coding assistance.
✗ Not Ideal For
- Real-time applications due to zero processing speed.
- Users requiring high-speed outputs.
How Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) Compares
Intelligence Index · Higher is better
AnthropicOpenAI
Benchmark Profile
Coding Index
AnthropicOpenAI
Intelligence · Coding · Math
Intelligence
Coding
Math
All Benchmark Scores (12)
| Benchmark | Score | |
|---|---|---|
| Intelligence Index | 64.9 | |
| Coding Index | 62 | |
| GPQA | 926% | |
| HLE | 533% | |
| SWE-Bench Verified | 95% | |
| SciCode | 60.2% | |
| IFBench | 63.5% | |
| LCR | 70% | |
| TerminalBench Hard | 62.9% | |
| Tau2 | 98.5% | |
| Arena Chat | 24.1 | |
| Arena Coding | 19 |
Data: Artificial Analysis · Updated: June 9, 2026
Frequently Asked Questions (3)
What is Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)?
It is a model by Anthropic focused on adaptive reasoning and high-effort tasks.
How much does Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) cost?
It costs $0 per million tokens.
What is Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) best for?
It is best for complex problem-solving, data analysis, and software development.
