Claude Fable 5 is the latest flagship model from Anthropic. Supports text and image inputs with advanced reasoning and creative capabilities. Token-based pricing: $8.00/M input tokens, $40.00/M output tokens. Two endpoints: standard async (/claude-fable-5) and live streaming (/claude-fable-5/stream) via SSE.
About this model
Claude Fable 5 is the latest flagship model from Anthropic, delivering top-tier reasoning, creative writing, and multimodal analysis. With support for both text and image inputs, it excels at complex multi-step tasks, technical work, and long-form content generation. Pricing is token-based: $8.00 per million input tokens and $40.00 per million output tokens. A newer, more capable version, Claude Fable 5.1, adds a 1M-token context window and always-on adaptive extended thinking for long-horizon agentic and research tasks.
Cost analysis
| Provider | Cost | Notes |
|---|---|---|
| muapiapp | $8.00/M input tokens, $40.00/M output tokens | Token-based billing. Minimum $0.001 per call. |
| Anthropic (official) | ~$15.00/M input tokens, ~$75.00/M output tokens | Official pricing via api.anthropic.com. Muapiapp pricing is significantly lower. |
| Fal.ai | Not available | Claude Fable 5 is not available on Fal.ai. |
Token-based billing. Minimum $0.001 per call.
Official pricing via api.anthropic.com. Muapiapp pricing is significantly lower.
Claude Fable 5 is not available on Fal.ai.
** Competitor pricing is estimated based on similar model architectures and usage tiers.
Configuration schema
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt | string | The user message or instruction. | Explain quantum entanglement in simple terms. |
| Image URL | string | Optional image URL for multimodal requests. | undefined |
| System Prompt | string | Optional system-level instruction to guide model behavior. | You are a concise and precise assistant. |
The user message or instruction.
Explain quantum entanglement in simple terms.Optional image URL for multimodal requests.
undefinedOptional system-level instruction to guide model behavior.
You are a concise and precise assistant.Developer documentation
POST /api/v1/claude-fable-5 — returns request_id, poll for result via /api/v1/predictions/{id}/result.
POST /api/v1/claude-fable-5/stream — returns a live Server-Sent Events stream (Content-Type: text/event-stream). Each chunk has the format data: {"choices":[{"delta":{"content":"text"}}]}, ending with data: [DONE].
See Streaming Documentation for full code examples.
Frequently asked
Pricing is token-based: $8.00 per million input tokens and $40.00 per million output tokens. The minimum charge per call is $0.001. Actual cost is deducted after each call based on token counts returned by the model.
/claude-fable-5 is async — you receive a request_id and poll for the result. /claude-fable-5/stream returns a live SSE stream. Use streaming for chat UIs; use the async endpoint for workflows and automation.
Yes. Pass an image_url in the request body to include an image as part of the user message for multimodal analysis.
Yes. [Claude Fable 5.1](/playground/claude-fable-5-1) is Anthropic's newer flagship release, adding a 1M-token context window and always-on adaptive extended thinking for long-horizon agentic coding and research tasks.