Claude Fable 5.1
anthropic/claude-fable-5.1Claude 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...
- Input price
- $9.50
$10.00USD / 1M tokens - Output price
- $47.50
$50.00USD / 1M tokens - Context window
- 1M
- Max output
- 128K
Try the model
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Model card
Specifications
Pricing
- Input
- $9.50 / 1M tokens
- Output
- $47.50 / 1M tokens
- Cache read
- $0.24 / 1M tokens
- Cache write
- $11.88 / 1M tokens
Context & modalities
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- Input
- Text, image
- Output
- Text
Capabilities
- Chat
- Supported
- Vision
- Supported
- Reasoning
- Supported
- Structured output
- Supported
- Function calling
- Supported
- Audio input
- Not supported
Access
- Provider
- Anthropic
- Model ID
- anthropic/claude-fable-5.1
- Execution
- sync
- Base URL
- https://api.sandbase.ai
- API
- Chat Completions API
- Endpoint
- /v1/chat/completions
- API
- Messages API
- Endpoint
- /v1/messages
Independent evaluations
Benchmarks
Scores on standardized evaluations, compared with other models on SandBase.
Metrics sourced from Artificial Analysis · Intelligence Index v4.3
Start building
Send your first request
Choose either supported API with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/chat/completions" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "anthropic/claude-fable-5.1",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Choose your model
Compare models
| Model | Context | Input / 1M | Output / 1M | Released |
|---|---|---|---|---|
Claude Fable 5.1This model Anthropic | 1M | $9.50 | $47.50 | Sep 1, 2026 |
Anthropic | 1M | $0.10 | $0.50 | Oct 7, 2026 |
Anthropic | — | Coming soon | Coming soon | Coming soon |
Anthropic | 1M | $2.00 | $10.00 | Sep 28, 2026 |
Anthropic | 1M | $4.00 | $20.00 | Sep 22, 2026 |
Anthropic | 1M | $5.00 | $25.00 | Jul 25, 2026 |
Questions
FAQ
How do I call Anthropic Claude Fable 5.1 through SandBase?
Create a SandBase API key, then send requests with the model ID "anthropic/claude-fable-5.1" to Chat Completions API (/v1/chat/completions) or Messages API (/v1/messages) at https://api.sandbase.ai. The request examples on this page show the exact payload.
How much does Anthropic Claude Fable 5.1 cost?
$9.50 per 1M input tokens and $47.50 per 1M output tokens with the current 5% discount (list price $10 / $50), billed per request from your SandBase balance.
What is the context window of Anthropic Claude Fable 5.1?
1M tokens of context, with up to 128K output tokens per response.
How does Anthropic Claude Fable 5.1 score on benchmarks?
Anthropic Claude Fable 5.1 scores 53.4 on the Artificial Analysis Intelligence Index (v4.3), ranking #3 of 84 models on SandBase; Coding Index 81.6, Agentic Index 57.9. Source: Artificial Analysis, measured as Claude Fable 5.1 (Max, Default Fallback).
Which features does Anthropic Claude Fable 5.1 support?
Anthropic Claude Fable 5.1 supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.
Do I need a separate Anthropic account?
No. One SandBase API key and balance gives you access to Anthropic Claude Fable 5.1 and the other models in the catalog; you do not need to sign up with Anthropic separately.