Anthropic: Claude Fable 5.1✓ Catalog verified
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Overview
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Access: available through the official Anthropic API. Context window: 1M.
Specifications
| API identifier | anthropic/claude-fable-5.1 |
| Provider | Anthropic |
| Model type | Multimodal LLM |
| Context window | 1M catalog |
| Input modalities | text · image · file |
| Output modalities | text |
| Released | Sep 1, 2026 |
| Tokenizer | Claude |
| Moderated | Yes |
| Architecture modality | text+image+file->text |
Pricing
Live pricing components for anthropic/claude-fable-5.1 as published in the catalog.
| Pricing component | Raw unit price | Normalized | Unit |
|---|---|---|---|
| Prompt tokens | $0.00001 | $10.00 / 1M | Per input token |
| Completion tokens | $0.00005 | $50.00 / 1M | Per output token |
| Request fee | N/A | N/A | Per request |
| Image fee | N/A | N/A | Per image unit |
| Web search fee | $0.01 | $0.010000 | Per search request |
Cost calculator
Estimate monthly spend from your own token volumes.
Estimated Total Cost
$15Calculated from current list pricing in the ModelsAtlas catalog.Capabilities
| Capability | Status | What it means |
|---|---|---|
| Visual Understanding | ✓ Supported | Image and document analysis support |
| Audio Processing | Not advertised | Speech and voice aligned flows |
| Tool Calling | ✓ Supported | Supports tools / function calling |
| Self-Hosting | Not advertised | Deploy outside managed APIs |
Capability signals
Directional signals derived from model metadata and capability tags — not official benchmark submissions.
Quick start
Call Anthropic: Claude Fable 5.1 through an OpenAI-compatible client.
from openai import OpenAI
client = OpenAI(
base_url="https://openrouter.ai/api/v1",
api_key="YOUR_API_KEY"
)
response = client.chat.completions.create(
model="anthropic/claude-fable-5.1",
messages=[{"role": "user", "content": "Explain quantum physics."}]
)
print(response.choices[0].message.content)Alternatives
Closest models by context window from a different provider.
| Model | Provider | Context | Input /1M | Actions |
|---|---|---|---|---|
| Amazon: Nova 2 Lite | Amazon | 1M | $0.30 | View → |
| Amazon: Nova Premier 1.0 | Amazon | 1M | $2.50 | View → |
Head-to-head comparisons
Side-by-side breakdowns of Anthropic: Claude Fable 5.1 against other frontier models.
Sources & attribution
Pricing and metadata are maintained in the ModelsAtlas catalog.
Frequently asked questions
How much does Anthropic: Claude Fable 5.1 cost?
$10.00 per 1M input tokens and $50.00 per 1M output tokens on the official Anthropic API.
What is the context window of Anthropic: Claude Fable 5.1?
Anthropic: Claude Fable 5.1 supports up to 1M tokens of context.
Does Anthropic: Claude Fable 5.1 support tool / function calling?
Yes, Anthropic: Claude Fable 5.1 supports tool / function calling — you can register tools and the model will emit structured tool calls.
How do I access Anthropic: Claude Fable 5.1?
Use the official Anthropic API with the model id `anthropic/claude-fable-5.1`. See the Quick start section above for code examples.