GPT‑5.6
GPT-5.6 is an advanced LLM model by Anthropic, offering state-of-the-art performance in software engineering, knowledge work, vision, and scientific research for complex tasks.
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GPT-5.6 (Claude Fable 5) demonstrates state-of-the-art performance on nearly all tested benchmarks of AI capability, showing exceptional results in software engineering, knowledge work, vision, and scientific research.
The model excels in software engineering tasks, capable of compressing months of engineering work into days. It can perform codebase-wide migrations in large codebases and scores highest among frontier models on difficult coding tasks requiring high-quality production code.
GPT-5.6 (Claude Fable 5) is the new state-of-the-art for vision tasks. It can extract precise numbers from scientific figures, rebuild web app source code from screenshots, and complete complex vision-only tasks like playing Pokémon FireRed with minimal scaffolding.
The model maintains focus across millions of tokens in long-running tasks and improves its outputs by using its own notes. Its performance with persistent file-based memory is significantly better than previous models, enabling it to handle complex, multi-day projects.
GPT-5.6 (Claude Fable 5.1) is designed for long-running agents and multi-day autonomous projects. It supports multiagent orchestration, allows agents to iterate against pre-defined exit criteria, and uses a memory tool for progressive improvement across sessions.
A variant of GPT-5.6, Claude Mythos 5, offers the strongest cybersecurity capabilities globally. It is deployed with lifted safeguards for cyberdefenders and infrastructure providers, initially through Project Glasswing in collaboration with the US government.
Detailed Pricing Info
- Achieves state-of-the-art performance across diverse AI benchmarks, including software engineering, knowledge work, vision, and scientific research.
- Demonstrates exceptional capabilities in software engineering, capable of rapidly performing complex tasks like large-scale codebase migrations.
- Features advanced vision capabilities, allowing it to extract precise data from complex figures and rebuild applications from visual inputs alone.
- Offers superior memory and long-context handling, staying focused across millions of tokens and improving outputs through self-generated notes and persistent memory.
- Includes robust agentic capabilities for autonomous, multi-day projects, with features like multiagent orchestration and self-improvement mechanisms.
- Offers competitive API pricing for Fable 5.1 and Mythos 5, significantly reducing costs compared to previous models like Claude Mythos Preview.
- Conservative safeguards in Fable 5 can sometimes lead to false positives, redirecting harmless requests to a less capable model.
- The full-capability Mythos 5 model is not generally available, with access initially limited to specific programs like Project Glasswing for cyberdefenders.
- Access to both Fable 5 and Mythos 5 was temporarily suspended shortly after launch, causing disruption to customers.
- Usage limits apply to individual and team subscription plans, which may restrict extensive use for some users.
What is GPT-5.6?
What are the key capabilities of GPT-5.6 (Claude Fable 5)?
How does Claude Mythos 5 differ from Claude Fable 5?
What is the pricing for GPT-5.6 (Claude Fable 5.1) API access?
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