Claude Fable 5 vs Claude Mythos 5.1
Detailed pricing comparison and cost analysis.
Updated September 2026
Cost Simulator
| Feature | Claude Fable 5 | Claude Mythos 5.1 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input Price (1M) | $10.00 | $10.00 |
| Output Price (1M) | $50.00 | $50.00 |
| Context Window | 1,000,000 | 1,000,000 |
Verdict
Claude Fable 5 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens. Claude Mythos 5.1 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens. Claude Fable 5 and Claude Mythos 5.1 have identical input token pricing. For output tokens, Claude Fable 5 is the more affordable option at $50.00/1M vs $50.00.
On context window, Claude Fable 5 supports 1,000,000 tokens — meaning it can fit more conversation history, documents, or code in a single request. This matters for RAG pipelines, long document analysis, and agentic workflows where context builds up over many turns.
When to choose Claude Fable 5
- ✓ You are already integrated with Anthropic
When to choose Claude Mythos 5.1
- ✓ You are already integrated with Anthropic
Use the calculator above to simulate your specific workload and find the exact break-even point. For most applications, the cheapest model is the one that minimises your total monthly bill given your input-to-output token ratio.
Frequently Asked Questions
Is Claude Fable 5 cheaper than Claude Mythos 5.1? ▼
Claude Fable 5 and Claude Mythos 5.1 have identical input token pricing at $10.00/1M tokens.
What is the context window of Claude Fable 5 vs Claude Mythos 5.1? ▼
Claude Fable 5 has a 1,000,000-token context window. Claude Mythos 5.1 has a 1,000,000-token context window. Claude Fable 5 supports the larger context, suitable for longer documents and agentic workflows.
Which model is better: Claude Fable 5 or Claude Mythos 5.1? ▼
The best choice depends on your use case. For cost efficiency on input tokens, Claude Fable 5 is the cheaper option. For maximum context length, Claude Fable 5 supports 1,000,000 tokens. Use the comparison table above to find the right fit for your workload.