Claude Fable 5 vs Claude Opus 4.5
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Claude Fable 5 and Claude Opus 4.5.
Claude Fable 5
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and...
Claude Opus 4.5
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and...
Technical Specifications
| Specification | Claude Fable 5 | Claude Opus 4.5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Context Window | 1,000,000 tokens | 200,000 tokens |
| Agent Suitability | N/A | 93/100 |
| Time to First Token (TTFT) | N/A | 550 ms |
| Deployment Model | managed api | managed api |
| Production Stability | beta | stable |
| API Available | Yes | Yes |
| Released Date | 2026-06-09 | 2025-11-24 |
API Pricing Comparison
Input Price per Million Tokens
Claude Fable 5
$10.00
Claude Opus 4.5
$5.00
Output Price per Million Tokens
Claude Fable 5
$50.00
Claude Opus 4.5
$25.00
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Claude Fable 5 Quirks & Gotchas
No developer gotchas reported.
Claude Opus 4.5 Quirks & Gotchas
- ▸Deep analytical reasoning — best for structured problem-solving
- ▸200K context is limiting compared to 1M of Opus 4.6+ — upgrade for long-document tasks