Claude Fable 5.1
Provider status: active · Identity verified 2026-10-08 · Official catalog
Inspect the documented capabilities, access conditions and sources for your task.
Initial research: 2026-09-21. Check current terms before choosing.
Automated fact checks · 8 fields
AI extraction with a second evidence validation pass. These dates apply to the listed fields.
- Input token price · 2026-10-09 · Source
- Output token price · 2026-10-09 · Source
- API access · 2026-10-08 · Source
- identity · 2026-10-08 · Source
- Work with long documents · 2026-10-09 · Source
- Call tools and functions · 2026-10-09 · Source
- Understand images · 2026-10-09 · Source
- Use extended reasoning · 2026-10-09 · Source
Updated
The facts
- Version
- 5.1
- Price
- $10 input / $50 output per million tokens. API usage. Tokens are pieces of text sent to or generated by the model. This is not a chat subscription.
- API
✓Supported - Open weights
✕Not supported - Commercial use
- yes
- Long context
✓Supported 1M token context window
Source for Long context (opens in a new tab)- Tool use
✓Supported Supports tool use; forced tool use returns an error (breaking change from prior model)
Source for Tool use (opens in a new tab)- Vision input
✓Supported Input modality listed as text and images → text
Source for Vision input (opens in a new tab)- Extended thinking
✓Supported Adaptive thinking always on; steer depth with effort setting
Source for Extended thinking (opens in a new tab)
From the publisher
Automatic source checks. These do not change the verification date of the facts above.
Sources
Beyond feature support
Quality evidence.
How well a model performs depends on the task, version, and settings.
We have not published a reviewed quality evaluation for these versions yet. Feature support and price do not establish output quality.
Try the same small task with each option. Check accuracy, consistency, and how much editing you need to get a usable result.