Claude Fable 5
Claude Fable 5 is a Claude 5 model from Anthropic, released in 2026-06. It costs $10 / $50 per 1M, has a 1M-token context window, and is best for hardest-coding, complex-reasoning, agents. Last verified 2026-06-11.
Spec sheet
Pricing
- Input
- $10 / 1M
- Output
- $50 / 1M
- Cached input
- $1 / 1M
- Batch discount
- 50%
- Free tier
- No
Context & speed
- Context window
- 1M tokens
- Max output
- 128k tokens
- Throughput
- ~50 tok/s
- Time to first token
- ~1000 ms
- Speed tier
- slow
Capabilities
- Tool use
- Yes
- Structured output
- Yes
- Prompt caching
- Yes
- Extended thinking
- Yes
- Vision input
- Yes
- Audio in / out
- No
- Fine-tuning
- No
Deployment
- Open weights
- No
- On-prem
- No
- HIPAA eligible
- Yes
- Zero retention
- Yes
- Regions
- us, eu
Estimated monthly cost
Assumes typical token shape: 2k input, 600 output per call. Prompt caching is excluded from these figures.
When to use Claude Fable 5
Sweet spot
- hardest coding
- complex reasoning
- agents
- long horizon tasks
- research
Known trade-offs
- 2x Opus pricing
- safety classifiers can decline edge-case requests
- overkill for routine tasks
Works with
Compare Claude Fable 5 to other models
FAQ — Claude Fable 5
How much does Claude Fable 5 cost?
Claude Fable 5 costs $10 / $50 per 1M tokens on the Anthropic API. Cached input reads cost $1 per 1M, cutting the input bill by roughly 90% on repeat system prompts. The batch API offers a 50% discount for async workloads.
What is the context window of Claude Fable 5?
Claude Fable 5 has a 1M-token context window with up to 128k tokens of output. That's enough for entire codebases, long transcripts, or multi-document RAG.
Does Claude Fable 5 have a free tier?
No — No free API tier; available via Claude.ai paid plans.
Is Claude Fable 5 HIPAA / EU / on-prem friendly?
Claude Fable 5 is HIPAA-eligible, available in EU regions, and is API-only. Zero data retention is available for enterprise customers.
What is Claude Fable 5 best for?
Claude Fable 5 is best for hardest coding, complex reasoning, agents, long horizon tasks. Trade-offs to be aware of: 2x Opus pricing; safety classifiers can decline edge-case requests; overkill for routine tasks.
Which tools and SDKs work with Claude Fable 5?
Claude Fable 5 integrates with Anthropic SDK, Claude Code, Cursor, AWS Bedrock, Google Vertex AI, Vercel AI SDK, LangChain, LlamaIndex, OpenRouter. Most major AI frameworks support it either natively or through OpenAI-compatible endpoints.