Claude Fable 5
anthropic/claude-fable-5AnthropicoperationalAnthropic's most capable model for demanding reasoning and long-horizon agentic work. Adaptive thinking, 1M context.
Official pricing
USD per million tokens, exactly what Anthropic publishes. ElevenRouter adds no markup on tokens.
Example: 1,000 input + 500 output tokens ≈ $0.03500. Zero-completion responses are never charged.
Specs
- Context
- 1M
- Max output
- 128K
- Modalities
- text+image+file->text
- Tokenizer
- Claude
- Released
- 2026-09-20
- Family
- claude-fable
Availability on ElevenRouter
Measured by the routing engine; up when at least one credential can serve the model.
Observed performance
Real requests over the last 7 days.
- Time to first token p50
- —
- p95
- —
- Output tokens/s p50
- —
- p95
- —
Percentiles appear after five successful requests.
Usage on ElevenRouter
Tokens per day across all customers (anonymous, aggregate).
Use it
Any OpenAI or Anthropic SDK works by changing the base URL. Supported parameters: max_tokens, temperature, top_p, top_k, stop, tools, tool_choice, reasoning, include_reasoning, response_format, structured_outputs.
curl https://elevenrouter.com/api/v1/chat/completions \
-H "Authorization: Bearer $ELEVENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{ "model": "anthropic/claude-fable-5", "messages": [{ "role": "user", "content": "Hello" }] }'Related models
- Claude Fable 5.1 · Anthropic$10.00 / $50.00
- Claude Sonnet 5 · Anthropic$2.00 / $10.00
- Claude Haiku 4.5 · Anthropic$1.00 / $5.00
- Claude Opus 4.6 · Anthropic$5.00 / $25.00
- Claude Opus 4.7 · Anthropic$5.00 / $25.00
- Claude Opus 4.8 · Anthropic$5.00 / $25.00
- Claude Opus 5 · Anthropic$5.00 / $25.00
- GPT-6 Astra · OpenAI$10.00 / $50.00
- GPT-5.6 Sol · OpenAI$4.00 / $20.00
Frequently asked questions
How much does Claude Fable 5 cost on ElevenRouter?
Claude Fable 5 is billed at Anthropic's official list price: $10.00 per million input tokens and $50.00 per million output tokens, with cached input at $1.00. A request with 1,000 input and 500 output tokens costs about $0.03500.
What is the context length of Claude Fable 5?
Claude Fable 5 accepts up to 1M tokens of context and can produce up to 128K output tokens.
Does Claude Fable 5 support tool calling and structured outputs?
Yes, tool calling is supported and JSON-schema structured outputs are native. Supported parameters: max_tokens, temperature, top_p, top_k, stop, tools, tool_choice, reasoning, include_reasoning, response_format, structured_outputs.
How do I call Claude Fable 5?
Send an OpenAI-compatible chat completion to https://elevenrouter.com/api/v1/chat/completions with "model": "anthropic/claude-fable-5" and your ElevenRouter key, or use the Anthropic Messages endpoint. Any OpenAI or Anthropic SDK works by changing the base URL.
Is Claude Fable 5 available right now?
Availability is measured continuously by the routing engine. Current status: operational, 100.00% uptime over the last 30 days. When one credential fails, requests fail over to another automatically.