Claude Fable 5
Parameters
Undisclosed
Context Length
1M
Modality
Multimodal
Architecture
Undisclosed
License
Proprietary
Release Date
9 Jun 2026
Knowledge Cutoff
Jan 2026
API Pricing (per 1M)
Input: $10.00 · Output: $50.00
Evaluation Benchmarks
Rank
#2
| Benchmark | Score | Rank |
|---|---|---|
General Text | high 1506 | 🥇 1 |
StackUnseen | 0.957 | 🥇 1 |
General | max 0.83 | 🥈 2 |
Coding | max 0.86 | 🥈 2 |
LiveBench Average | max 0.83 | 🥈 2 |
Data Analysis | max 0.81 | 🥉 3 |
Mathematics | max 0.96 | 4 |
Agent Arena | high 0.09 | 5 |
Intelligence Index | max 0.50 | 6 |
Agentic Coding | max 0.62 | 7 |
Web Development | high 1628 | 9 |
Reasoning | max 0.90 | 9 |
Coding Index | max 0.77 | 12 |
Agentic Index | max 0.51 | 14 |
Rankings
Overall Rank
#2 🥈
Coding Rank
#4
About Claude Fable 5
Anthropic's advanced frontier model released June 9, 2026. Built on a unified architecture shared with Mythos 5, Fable 5 incorporates advanced safety classifiers for cybersecurity, biology, and chemistry. When these classifiers trigger, requests are automatically and seamlessly routed to Claude Opus 4.8. Features a 1M token context window, a maximum output limit of 128K tokens, and is priced at $10.00 per million input tokens and $50.00 per million output tokens. Note: Access was suspended on June 12, 2026, following a US government export control directive.
Technical Specifications
Architecture specifications are undisclosed for proprietary models.
Resources
About Claude Fable 5
Anthropic's Claude Fable 5 generation, released June 9, 2026, shares a unified frontier architecture with Mythos 5, incorporating advanced safety classifiers for cybersecurity, biology, and chemistry, with fallback routing to Claude Opus 4.8.