Claude Fable 5.1
Anthropic · Multimodal · Released Sep 2026
Claude Fable 5.1 is Anthropic's reasoning-focused model with a 1 million token context window, released in September 2026 as an incremental improvement over Claude Fable 5.
- Strengths
- Handles complex multi-step reasoning and extended agentic work with strong performance across demanding inference tasks.
- Best for
- Batch processing workflows requiring advanced reasoning capabilities where throughput and asynchronous processing are priorities.
- Limitations
- Superseded by Claude Opus 5.5 for users who need Anthropic's latest flagship capabilities; Claude Fable 5.1 (batch) should be preferred for async workloads where this standard inference mode is used.
Input / 1M
$10.00
Output / 1M
$50.00
Cached input / 1M
$0.25
Context window
1M
Also billed
- Cache write
- $12.50 / 1M
Price history
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 1 Sep 2026 | $10.00 | $50.00 | $0.25 | Imported from OpenRouter | openrouter.ai |