anthropic/claude-fable-5.1
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...
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API details and access
Model Details
ProviderAnthropic
TypeLlm
Model IDanthropic/claude-fable-5.1
Capabilities
InputTextImage
OutputText
Context-
Max Output128,000
VisionSupported
Function CallingSupported
Access details
Messages APIBase URLhttps://api.sandbase.ai
API Endpoint/v1/messages
{
"model": "anthropic/claude-fable-5.1",
"system": "You are a helpful assistant.",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 512
}Pricing
Input$10.00 / 1M tokens
Output$50.00 / 1M tokens
Cache read$0.25 / 1M tokens
Cache write$12.50 / 1M tokens
Production endpoint
Send your first request
OpenAI-compatible endpoint with unified authentication and usage tracking.
POST
https://api.sandbase.ai/v1/chat/completionsModel ID
anthropic/claude-fable-5.101
Input Schema
8 parameters · 1 required · 7 optional
| Parameter | Type | Required | Description |
|---|---|---|---|
messages | object[] | Required | — |
stop | string[] | Optional | — |
tools | array | Optional | — |
stream | boolean | Optional | Default: false |
max_tokens | integer | Optional | Max: 128000 |
temperature | number | Optional | Min: 0 · Max: 2 · Default: 1 |
tool_choice | string | Optional | — |
response_format | object | Optional | — |
02
Output Schema
| Field | Type | Description |
|---|---|---|
id | string | Unique identifier for the completion |
object | string | Object type, e.g. "chat.completion" |
model | string | Model used for the completion |
choices | array | List of completion choices |
choices[].message.content | string | Generated text content |
choices[].finish_reason | string | Reason the generation stopped |
usage.prompt_tokens | integer | Number of tokens in the prompt |
usage.completion_tokens | integer | Number of tokens in the completion |
usage.total_tokens | integer | Total tokens used |
03
Code Examples
Ready-to-run snippets
curl https://api.sandbase.ai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "anthropic/claude-fable-5.1",
"messages": [{"role": "user", "content": "Hello"}],
"temperature": 0.7,
"max_tokens": 2048,
"stream": true
}'