Anthropic: Claude Fable 5.1
This AI model, Claude Fable 5.1, is designed for handling various input modalities, including text, image, and file types. It can process long context lengths of up to 1 million tokens and supports both tools and reasoning capabilities. Considering its pricing, at $10 per million input tokens and $50 per million output tokens, this model may be worth shortlisting for those with high-volume tasks who prioritize processing large amounts of text or files in conjunction with image inputs. The model's benchmark performance, a blended score of 100 across three independent benchmarks, also suggests it can handle complex queries with some degree of proficiency.
Benchmark results
Independent, published benchmarks. Blended score 100.0 across 3 benchmarks, last refreshed 2026-09-04. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 100.0 |
| AI Index Coding | software engineering tasks | 100.0 |
| AI Index Agentic | multi-step tool-using tasks | 100.0 |
- Model ID
- anthropic/claude-fable-5.1
- Vendor
- anthropic
- Released
- September 2026
- Tokenizer
- Claude
- Input Modalities
- text, image, file
- Output Modalities
- text
- Max Output
- 128,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
What it costs in practice
Computed from the current $10.00/M input and $50.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.38 |
| Classify 1,000 customer emails | 500k in / 50k out | $7.50 |
| A month of a busy support chatbot | 5M in / 2M out | $150.00 |
Similar models
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Anthropic: Claude Opus 4.1
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Anthropic: Claude 3 Haiku
Anthropic: Claude Fable 5.1 (batch)
Quick answers
- How much does Anthropic: Claude Fable 5.1 cost?
- $10.00 per million input tokens and $50.00 per million output tokens.
- What is Anthropic: Claude Fable 5.1's context window?
- 1,000,000 tokens, roughly 1,500 pages of text in a single request.
- Does Anthropic: Claude Fable 5.1 support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can Anthropic: Claude Fable 5.1 process images?
- Yes, it accepts image input.