Claude claude-fable-5 API
Same API key, same model skill workflow — switch variants by changing one model ID.
# Install the model skill for app development workflows
npx skills add runapi-ai/claude -gInstall the Claude skill for this app: 1. Add runapi-ai/claude with the skills installer. 2. Load SKILL.md in this workspace. 3. Use its docs, schemas, pricing notes, and setup steps when adding model features. 4. Confirm the install path when done.
claude-fable-5 targets the sweet spot of quality and cost within the Claude family.
- Pay-per-call pricing in USD
- Failed generations not charged
- Streaming when supported by the model
- Schema-validated tool calls
Pricing
Technical details
| Model ID | claude-fable-5 |
| Provider | Anthropic |
| Modality | text |
| Task type | synchronous |
| Billing unit | 1K tokens |
| API endpoint | /v1/messages |
| Commercial license | Yes — included via API |
| Status | Operational |
Model skill — claude-fable-5
Install the skill once, then use the variant ID from this page while building.
# Install the model skill for app development workflows
npx skills add runapi-ai/claude -gInstall the Claude skill for this app: 1. Add runapi-ai/claude with the skills installer. 2. Load SKILL.md in this workspace. 3. Use its docs, schemas, pricing notes, and setup steps when adding model features. 4. Confirm the install path when done.
Use claude-fable-5 with a model skill
Install
Install the model skill for this model line.
Configure
Set the model field to the full model ID shown on this page.
Call
Use the skill instructions while adding prompt, input, and callback handling to your app.
Receive
Read the task response, webhook callback, or cached output URL from RunAPI.
What's different about claude-fable-5
Mythos-class 1M context; state-of-the-art coding, reasoning, and vision
Dated snapshot of Haiku 4.5 for reproducible outputs
Mythos-class 1M context; state-of-the-art coding, reasoning, and vision
claude-opus-4-5-20251101
Mythos-class 1M context; state-of-the-art coding, reasoning, and vision
1M token context; frontier reasoning at $5/$25 per M tokens
Best for
Customer support
Answer customer questions from a private knowledge base, reducing ticket volume.
Document analysis
Draft contract summaries and flag key clauses for attorney review.
Code generation
Auto-generate unit tests, code reviews, and refactoring suggestions in CI.
Frequently asked questions about claude-fable-5
Is the model ID stable across versions?
RunAPI keeps the model ID stable and handles compatible version refreshes without changing your request shape.
What's the rate limit on this variant?
Per-key rate limits scale with usage tier. See pricing page for current limits.
Can I switch variants later?
Yes — variant is a flag. Switch by changing the model parameter.
Does it stream?
Where streaming is available, RunAPI streams end-to-end.
Where do I report quality issues?
Open an issue on the public GitHub repo or email support.
Other variants of Claude
Alternatives from other models
DeepSeek
Embedding
Gemini