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Claude Fable 5.1
Claude Fable 5.1 is a large language model from Anthropic, released on August 20, 2026. It offers a 1,000,000 token context window and is positioned as a premium option for users requiring extensive context handling at the same price point as GPT-6 Astra.
Pricing
| model | input / 1M | output / 1M | context |
|---|---|---|---|
| Claude Fable 5.1 | $10 | $50 | 1,000,000 |
Rates come from the OpenRouter price list and are checked daily (prices updated 2026-11-11)
Comparison with Competing Models
| model | input / 1M | output / 1M | context |
|---|---|---|---|
| Claude Fable 5.1 | $10 | $50 | 1,000,000 |
| GPT-6 Astra | $10 | $50 | 1,050,000 |
| Claude Opus 5 | $5 | $25 | 1,000,000 |
| Kimi K3 | $0.192 | $16 | 1,048,576 |
| Grok 4.6 | $2 | $6 | 500,000 |
Among the models in this comparison, Grok 4.6 has the lowest output price at $6 per million tokens, while Claude Fable 5.1 and GPT-6 Astra are the most expensive at $50 per million output tokens.
Articles About Claude Fable 5.1
No articles about this model have been published yet.
Frequently Asked Questions
- How much does Claude Fable 5.1 cost?
- Claude Fable 5.1 costs $10 per million input tokens and $50 per million output tokens. These rates are identical to GPT-6 Astra.
- What is the context window of Claude Fable 5.1?
- Claude Fable 5.1 supports a context window of 1,000,000 tokens. This matches Claude Opus 5 and is slightly smaller than GPT-6 Astra's 1,050,000 tokens.
- How does Claude Fable 5.1 compare to Claude Opus 5?
- Both models share the same 1,000,000 token context window and come from the same Anthropic family. However, Claude Opus 5 costs half as much at $5 per million input tokens and $25 per million output tokens, making it a more affordable alternative for everyday work.
- When was Claude Fable 5.1 released?
- Claude Fable 5.1 was released on August 20, 2026. It represents a refresh of the Fable 5 line, which Anthropic had withdrawn in June 2026 and restored on July 1, 2026.
- Which model offers the best value among the competitors?
- Current OpenRouter rates per million input / output tokens (updated 2026-11-11): Claude Fable 5.1 $10 / $50, GPT-6 Astra $10 / $50, Claude Opus 5 $5 / $25, Kimi K3 $0.192 / $16, Grok 4.6 $2 / $6. The lowest output price is Grok 4.6 at $6.