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claude-fable-5-1 Next generation intelligence for long-running agents

Access to Claude Fable 5 has been restored. It brings 5th-generation intelligence to your most ambitious coding and professional work.

Excels at agentic reasoning, knowledge work, and tool use.

OpenAI's most capable model, engineered for the hardest tasks and long-running agentic workflows. GPT-5.5 Pro excels at complex coding, computer use, deep research, data analysis, and scientific reasoning — delivering frontier-level intelligence at GPT-5.4 latency with greater token efficiency. Ideal for enterprise and professional use cases demanding the highest standard of accuracy and autonomous task execution.

DeepSeek V4 Flash is an efficiency-optimized Mixture-of-Experts model from DeepSeek with 284B total parameters and 13B activated parameters, supporting a 1M-token context window. It is designed for fast inference and high-throughput workloads, while maintaining strong reasoning and coding performance.

OpenAI's smartest and most intuitive flagship model, designed for complex coding, agentic workflows, computer use, data analysis, and in-depth research. Delivers frontier-level intelligence with the same low latency as GPT-5.4, while completing tasks with greater token efficiency. The go-to model for demanding professional and enterprise workloads.