Claude Fable 5
Superseded by claude-fable-5-1 (same price, cheaper cache reads). Still served; retirement not sooner than 2027-06-09. Sibling claude-mythos-5 (Project Glasswing only, no safety classifiers).
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- Knowledge cutoff
- 2026-01
- Input
- text, image, pdf
- Output
- text
- License
- proprietary
- Pricing
- input: $10 · output: $50 · cache read: $1 (per 1M tokens (USD); Batch API 50% off) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| Anthropic API (Claude API) | claude-fable-5 | https://api.anthropic.com/v1/messages | docs |
| AWS Bedrock (Messages API / Mantle) | anthropic.claude-fable-5 | — | docs |
| Google Cloud Vertex AI | claude-fable-5 | — | docs |
| Microsoft Foundry (Azure) | claude-fable-5 | — | docs |
| Claude Platform on AWS | claude-fable-5 | — | docs |
| OpenRouter | anthropic/claude-fable-5 | openrouter.ai/anthropic/claude-fable-5 | — |
| Web app | — | claude.ai | — |
Notable capabilities (5)
- Strongest cybersecurity capabilities (Mythos 5): Anthropic called the Fable 5 / Mythos 5 generation the 'strongest cybersecurity capabilities of any model in the world'. Mythos 5 runs without safety classifiers for Glasswing defenders. source
- FIRST Rebuild web apps from screenshots: Anthropic claims it was the first model to rebuild a web app's source code from screenshots alone. It also completed Pokemon FireRed using vision only. source
- Massive code migrations: Stripe reported a 50-million-line migration done in one day instead of about two months. source
- Novel scientific hypotheses: In blind comparisons, scientists preferred its molecular-biology hypotheses about 80% of the time over Opus-class models. source
- FIRST Refusal stop reason with fallbacks: Safety classifiers can decline a request with stop_reason 'refusal'. A server-side fallbacks parameter retries on another Claude model. source
Previous top-tier model. Prefer claude-fable-5-1 for new work.
curl https://api.anthropic.com/v1/messages \
-H "x-api-key: $ANTHROPIC_API_KEY" -H "anthropic-version: 2023-06-01" -H "content-type: application/json" \
-d '{"model":"claude-fable-5","max_tokens":16000,"messages":[{"role":"user","content":"Hello"}]}'
Sources:
- Model page: https://platform.claude.com/docs/en/models/fable-5/overview
- Announcement: https://www.anthropic.com/news/claude-fable-5-mythos-5
- Pricing: https://platform.claude.com/docs/en/about-claude/pricing
- Models overview: https://platform.claude.com/docs/en/about-claude/models/overview
- Deprecations: https://platform.claude.com/docs/en/about-claude/model-deprecations
Other Anthropic models
Claude Sonnet 5.5 · Claude Opus 5.5 · Claude Fable 5.1 · Claude Mythos 5.1 · Claude Haiku 4.5 · Claude Opus 5 · Claude Sonnet 5 · Claude Opus 4.8 · Claude Opus 4.7 · Claude Sonnet 4.6 · Claude Opus 4.6 · Claude Opus 4.5 · Claude Sonnet 4.5 · Claude Opus 4.1 · Claude Sonnet 4