Claude Fable 5.1
NewTop-tierAnthropic's upgraded Mythos-class flagship, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work.
1M-token context tuned for long code refactors, front-end and visual code generation, and finance and analysis tasks. More concise than Fable 5 in its plans and summaries. A direct upgrade wherever Fable 5 is used today, and a strong pair alongside Opus 5 on reasoning-heavy work.
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Claude Fable 5.1 is very affordable at $10.00/M tokens input and $50.00/M tokens output. Cached input reads are priced at $0.25/M tokens, making repeated context cheaper. The model supports vision/image input, extended reasoning, a 1M context window.
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Nemotron 3 Ultravs Claude Fable 5.1Frequently Asked Questions about Claude Fable 5.1▼
When was Claude Fable 5.1 released?
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Claude Fable 5.1 was released on September 1, 2026.
Who created Claude Fable 5.1?
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Claude Fable 5.1 was created by Anthropic.
How much does Claude Fable 5.1 cost?
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Claude Fable 5.1 costs $10.00/M input tokens and $50.00/M output tokens.
What is Claude Fable 5.1 API pricing?
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The Claude Fable 5.1 API is priced at $10.00 per million input tokens and $50.00 per million output tokens. You can access Claude Fable 5.1 through idapt.app alongside 200+ other AI models in one workspace.
Is Claude Fable 5.1 a reasoning model?
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Yes, Claude Fable 5.1 is a reasoning model. It can think step-by-step through complex problems before providing an answer, often yielding better results on difficult tasks like math, coding, and multi-step logic.
Does Claude Fable 5.1 support image or vision input?
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Yes, Claude Fable 5.1 supports vision/image input. You can share images in your conversation and the model will analyze and respond based on their content.
Does Claude Fable 5.1 support audio?
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No, Claude Fable 5.1 does not support audio input.
What is the context window of Claude Fable 5.1?
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Claude Fable 5.1 has a context window of 1M tokens, meaning it can process approximately 750,000 words of context at once.
Is Claude Fable 5.1 open source?
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Claude Fable 5.1 is a proprietary model developed by Anthropic. The model weights and training data are not publicly available.
What is Claude Fable 5.1 good at?
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Based on benchmark data, Claude Fable 5.1 excels at: visual analysis and image understanding. It is Anthropic's capable model suitable for a wide range of tasks.
Where can I use Claude Fable 5.1?
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You can chat with Claude Fable 5.1 on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access Claude Fable 5.1 through Anthropic's own API or platform.