Claude Fable 5.1
Claude Fable 5.1 is a chat-oriented large language model from Anthropic, tracked on this page with measured output throughput of roughly 61 tokens per second.
API Pricing
Cheapest on Anthropic — 38% below avg| Provider | Input / 1M | Output / 1M | Cached / 1M |
|---|---|---|---|
| $5.00 | $25.00 | $0.125 | |
| $5.00 | $25.00 | $0.125 | |
| $10.00 | $50.00 | $0.250 | |
| $10.00 | $50.00 | $0.250 | |
| $10.00 | $50.00 | $0.250 |
Prices updated daily. Last check: Sep 2, 2026
Claude Fable 5.1 pricing by provider
Input, output, and batch rates, plus alternatives, for one provider at a time.
Performance & Benchmarks
Source: Artificial Analysis →Reasoning & Knowledge
- GPQA Diamond93.7%
- Humanity's Last Exam59.1%
Coding
- SciCode62.0%
Agentic & Tool Use
- Terminal-Bench v2.191.4%
- τ-bench Banking47.2%
Instruction & Long Context
- Long-Context Reasoning80.0%
Benchmarks measured Sep 2026. Scores are independent evaluations, not vendor-reported.
Model Details
General
- Creator
- Anthropic
- Modalities
- Text
Capabilities
- Tool Calling
- No
- Open Source
- No
Strengths & Limitations
Strengths
- Measured sustained output of about 61.4 tokens per second, adequate for long-form drafting and batch generation
- Part of Anthropic's Claude line, so it slots into existing Anthropic-oriented tooling and prompting conventions
- Independent third-party serving benchmarks (Artificial Analysis) are available rather than only vendor-reported numbers
- Chat-formatted interface suits multi-turn assistants, summarization, and rewriting workloads
- Listed across the providers shown in the pricing table on this page, allowing side-by-side cost comparison
Limitations
- Time to first token measured at roughly 16.1 seconds, which is poor for interactive or streaming-first user interfaces
- We do not currently track a confirmed context window for this model, so long-document limits must be checked with the provider
- No reasoning, coding, or knowledge benchmark scores are recorded in our database for this entry
- Modality support beyond text chat is not confirmed in our data
- Output throughput of ~61 tokens/sec trails faster small models used for high-volume, low-latency tasks
Key Features
About Claude Fable 5.1
Common Use Cases
Claude Fable 5.1 suits text workloads where total completion quality matters more than the delay before the first character appears: long-form drafting, document summarization, rewriting and editing passes, question answering over supplied context, and background content generation in queues or cron jobs. The measured ~16 second time to first token makes it a weak fit for typeahead, live chat widgets, voice agents, or any UI where a user is watching a cursor blink; if you do serve it interactively, plan for a loading state rather than token-by-token streaming from the outset. Because our entry does not record confirmed context-window or vision support, validate those requirements directly with your provider before committing to document-heavy or image-input pipelines. For teams already standardized on Anthropic prompting patterns, it is worth evaluating against other Claude entries in this catalog on a per-task basis.
Frequently Asked Questions
How much does Claude Fable 5.1 cost?
Pricing varies by provider and by pricing model — some bill separately for input and output tokens, others offer cached-input rates or dedicated capacity. Because rates change frequently, we do not quote figures in this write-up. Check the pricing table on this page for the current per-provider rates.
What is Claude Fable 5.1 best used for?
It is a chat model, so it fits multi-turn conversation, summarization, drafting, rewriting, and question answering. Its measured sustained throughput of roughly 61 tokens per second works well for long-form and batch generation, while its high time to first token makes it less suited to latency-sensitive interactive interfaces.
How fast is Claude Fable 5.1?
Artificial Analysis measurements put it at about 61.4 output tokens per second with a time to first token of roughly 16.1 seconds. The generation rate is mid-range; the first-token latency is on the slow side, so perceived responsiveness in a live chat UI will be limited by that initial wait.
What context window does Claude Fable 5.1 support?
We do not currently have a confirmed context window recorded for this model. That means unknown rather than small — check Anthropic's documentation or your chosen provider's model page for the supported input length before building around long documents.
Does Claude Fable 5.1 accept images or other non-text input?
Our database records it as a chat model and does not confirm additional input modalities. Absence of that field in our catalog is not evidence that the capability is missing, so verify multimodal support with the provider you plan to use.