Claude Fable 5 vs Claude Opus 4.8
How Claude Fable 5 (Anthropic) and Claude Opus 4.8 (Anthropic) compare on price, context window and best-fit use case.
In short: Claude Fable 5 is best for the hardest multi-step agentic and coding work, frontier reasoning, and long-running autonomous tasks where capability matters most, while Claude Opus 4.8 suits complex coding agents, long-horizon tasks, and workloads needing top reliability and reasoning. On price it's $10.00 vs $5.00 per 1M input tokens; on context, 1M tokens (128K max output) vs 1M tokens.
Verdict
Claude Fable 5 is the more capable pick (Bq score 98 vs 93). Choose Claude Opus 4.8 if budget leads: its input price is $5.00 per 1M vs $10.00.
| Spec | Claude Fable 5 | Claude Opus 4.8 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Context window | 1M tokens (128K max output) | 1M tokens |
| Input price /1M | $10.00 | $5.00 |
| Output price /1M | $50.00 | $25.00 |
| Modalities | text, image | text, image |
| Best for | The hardest multi-step agentic and coding work, frontier reasoning, and long-running autonomous tasks where capability matters most. | Complex coding agents, long-horizon tasks, and workloads needing top reliability and reasoning. |
Claude Fable 5
- State-of-the-art reasoning and benchmarks
- Elite long-horizon agentic coding
- 1M context with adaptive thinking always on
- Scientific research and knowledge work
Claude Opus 4.8
- Best-in-class coding and agentic tasks
- Adaptive reasoning with effort controls
- 1M context at flat rate
- Strong instruction following and safety