Claude Fable 5
Parameters
-
Context Length
1M
Modality
Multimodal
Architecture
Dense
License
Proprietary
Release Date
9 Jun 2026
Knowledge Cutoff
-
Evaluation Benchmarks
Rank
#1
| Benchmark | Score | Rank |
|---|---|---|
General Text | 1508 | 🥇 1 |
General max | 0.83 | 🥈 2 |
Coding max | 0.86 | 🥈 2 |
LiveBench Average max | 0.83 | 🥈 2 |
Mathematics max | 0.96 | 🥉 3 |
Data Analysis max | 0.81 | 🥉 3 |
Agentic Coding max | 0.62 | ⭐ 6 |
Web Development | 1628 | ⭐ 6 |
Agent Arena high | 0.11 | ⭐ 7 |
Reasoning max | 0.90 | 9 |
Rankings
Overall Rank
#1 🥇
Coding Rank
#8
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
Detailed architecture specifications are limited 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.