New Model Available: Claude Fable 5.1

Anthropic released Claude Fable 5.1, its latest model for demanding reasoning and long-horizon agentic work, featuring a 1M-token context window, adaptive thinking, and support for text and image inputs. The model is priced at $10 per million input tokens and $50 per million output tokens, with read and write speeds of 0.25 and 12.5-20 tokens per million respectively.

Claude Fable 5.1 is Anthropic’s latest model for demanding reasoning and long-horizon agentic work, with stronger performance in long-running coding, multistep research, and document, spreadsheet, and slide workflows. It supports text and image inputs, text output, a 1M-token context window, and adaptive thinking that is always on with effort-based steering. Back to Models https://zenmux.ai/models Providers Route requests across multiple providers. Copy a provider slug to set your preference. $10 / M tokens $50 / M tokens Read: 0.25 / M tokens Write: 12.5-20 / M tokens1M4.36s38.9tps $10 / M tokens $50 / M tokens Read: 0.25 / M tokens Write: 12.5-20 / M tokens1M2.85s53.5tps Uptime 24hours Direct request success rate on AI Gateway and per-provider. Throughput 24hours P50 throughput on live AI Gateway traffic, in tokens per second TPS . Latency 24hours P50 time to first token TTFT on live AI Gateway traffic, in milliseconds. Activity Token volume and request traffic to this model over time. Apps Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for. View All https://zenmux.ai/analytics/apps Related Models More models from Anthropic https://zenmux.ai/anthropic