Kimi K2.6
Anthropic's state-of-the-art Mythos-class LLM, Kimi K2.6 (Claude Fable 5/Mythos 5), excels in complex tasks like software engineering and scientific research.
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Kimi K2.6 (Fable 5/Mythos 5) exceeds the capabilities of any previously generally available model, showing exceptional performance in software engineering, knowledge work, vision, and scientific research on nearly all tested benchmarks.
The model stays focused across millions of tokens in long-running tasks and improves its outputs using its own notes, enabling autonomous work for longer durations than previous Claude models.
Capable of complex software engineering tasks, including codebase-wide migrations (e.g., 50-million-line Ruby codebase in a day) and passing difficult coding tasks while meeting high production code standards.
Demonstrates strong performance on complex analytical tasks, including document-based reasoning, chart and table interpretation, problem-solving, factual lookup, conceptual reasoning, root-cause analysis, and expected-value analysis.
The model is state-of-the-art for vision tasks, capable of extracting precise numbers from detailed scientific figures, rebuilding web app source code from screenshots, and performing complex vision-based tasks with minimal scaffolding (e.g., playing Pokémon FireRed with vision alone).
The Mythos 5 version, with lifted safeguards, offers the strongest cybersecurity capabilities of any model in the world, initially deployed through Project Glasswing for cyberdefenders and infrastructure providers.
Designed for long-running agentic work and multi-day autonomous projects, Kimi K2.6 (Fable 5.1) supports interaction with external tools and APIs, code execution, structured outputs, and a 1 million token context window.
Detailed Pricing Info
- State-of-the-art performance exceeding previous models across various benchmarks, particularly for complex and long tasks.
- Exceptional software engineering capabilities, demonstrated by performing large-scale codebase migrations and passing difficult coding tasks to production standards.
- Advanced vision processing, capable of extracting precise data from images, rebuilding applications from screenshots, and performing complex vision-based tasks with minimal assistance.
- Strong analytical and knowledge work performance, excelling in complex reasoning, document interpretation, and problem-solving for senior-level tasks.
- Enhanced memory and long-context handling, allowing it to maintain focus and improve performance over millions of tokens in long-running tasks.
- Specialized cybersecurity model (Mythos 5) offering world-leading capabilities for critical infrastructure protection.
- The general-use Fable 5 model includes conservative safeguards that may sometimes block harmless requests, triggering a fallback to a less capable model (Claude Opus 4.8) in less than 5% of sessions.
- Mythos 5 has limited access, initially deployed for a small group of cyberdefenders and infrastructure providers, with broader access planned for a 'trusted access program' later.
- The token-based pricing ($10/M input, $50/M output) can be significant for high-volume usage, despite being less than previous models like Claude Mythos Preview.
What is Kimi K2.6?
What are the main differences between Fable 5 and Mythos 5?
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