Claude Fable 5.1

tools vision

claude-fable-5.1Most advanced model from Anthropic

Try in playground

+100% credit with a usage package. $100 buys $200 of usage on this model — from $10.

Input / 1M tokens

$10

$0.00001 / token

Output / 1M tokens

$50

$0.00005 / token

Cached input / 1M

$0.25

Uptime · 24h

100%

6 requests

Details

Type: Chat
Input: text, image, file
Output: text
Context: 1,000,000 tokens

Supported parameters

max_tokenstemperaturetop_pstopseedpresence_penaltyfrequency_penaltyresponse_formatpluginstoolstool_choiceparallel_tool_calls

Last 24 hours

Requests per hour; red = provider errors.

Avg latency: 14.9s
Avg first token: 6.5s
Throughput: 97.1 tok/s

Endpoints

Requests go to these routes in order and fail over between them. Pick or exclude them by label with provider.order / only / ignore, or reorder with provider.sort.

Label	Input / output per 1M	First token	Throughput	Status
`primary`	$10 / $50	—	—	Available
`alt`	$10 / $50	—	—	Available
`backup`	$10 / $50	—	—	Available

Use it

curl https://api.ultragpt.pro/v1/chat/completions \
  -H "Authorization: Bearer $ULTRAGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-fable-5.1",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Anthropic SDK / Claude Code

curl https://api.ultragpt.pro/v1/messages \
  -H "x-api-key: $ULTRAGPT_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-fable-5.1",
    "max_tokens": 1024,
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'