claude-fable-5-1

AnthropicChat & Reasoning

Claude model for long-context reasoning and general assistant workloads.

API IDclaude-fable-5-1
View setup
View usage

Overview

Context
1,000,000 tokens
Input
Text, Image
Output
Text
Providers
Anthropic Foundry Endpoint
Released
Sep 2026
Latest operational check
Healthy
API compatibility
  • OpenAI Chat Completions
  • Anthropic Messages
Recommended for
  • General-purpose reasoning
  • Long-context analysis
  • Production assistants

Keep in mind: A specialized AI Service matches the workload more directly

Supported features
  • Function calling: Supported
  • Structured outputs: Not supported
  • Vision: Supported
  • Streaming: Supported
  • Reasoning: Supported
  • Prompt caching: Supported
Supported parameters
max_completion_tokensmax_tokensparallel_tool_callsreasoning_effortresponse_formatstopstreamtemperaturetool_choicetoolstop_puser
View API reference

Make your first request

View full setup 
curl --fail-with-body https://gateway.primexos.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-fable-5-1","messages":[{"role":"user","content":"Hello from Primex"}],"stream":false}'

Executing this request uses your account’s API credits.

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