Claude Fable 5.1: price, context window and capabilities
Claude Fable 5.1 is a model from Anthropic (anthropic/claude-fable-5.1). It supports reasoning. It supports tool use. It costs $10.00 per million input tokens and $50.00 per million output tokens, with a 1M-token context window.
What it costs in practice
Using the listed prices: a chat turn of 2,000 input and 500 output tokens costs about $0.045, so 10,000 such turns cost about $450.00. Summarising a 100,000-token document into 2,000 tokens costs about $1.10. A long agent run that reads 1 million tokens and writes 50,000 costs about $12.50.
How it compares
Among the 40 models we track, Claude Fable 5.1 ranks #40 by input price and #40 by output price (1 is cheapest), and #19 by context window (1 is largest). Models with the same tool and reasoning support that cost less per output token: DeepSeek V4 Pro 0423 ($0.418), Qwen3.8 Omni Flash ($0.470), Qwen3.8 Flash ($0.470), GPT-6 Luna Pro ($0.500). Models with a larger context window at the same or lower output price: Llama 4 Scout (1.3M), GPT-6.1 Sol Pro (1.1M), GPT-6.1 Sol (1.1M), GPT-6 Luna Pro (1.1M).
More from Anthropic
- Claude Sonnet 5.5: $2.00 in / $10.00 out, 1M context
- Claude Opus 5.5: $4.00 in / $20.00 out, 1M context
- Claude Opus 5: $5.00 in / $25.00 out, 1M context
In the news
- GPT-6 Astra takes WebDev Arena #1, 35 points over Fable 5.1 7 Sept 2026
- Claude Fable 5.1 more than doubles Anthropic's science score 1 Sept 2026
Prices and limits come from OpenRouter's public model catalogue, last synced 4 Oct 2026. Provider pricing can differ from OpenRouter's and changes often; confirm on the provider's own page before you commit. See the guide to choosing a model or the full comparison.
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