API model · 2 comparisons
Claude Fable 5.1 compared
Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens and reads up to 1,000,000 tokens in one request. Here it is compared with Claude Opus 5.5 and GPT-6 Astra. Pick a matchup for the full side-by-side, a monthly cost calculator and our verdict.
Prices checked 13 November 2026 from the OpenRouter API.
Claude Fable 5.1 at a glance
- Input / 1M tokens
- $10.00
- Output / 1M tokens
- $50.00
- Context window
- 1,000,000 tokens
- Longest reply
- 128,000 tokens
- Accepts
- file, image, text
- Providers on OpenRouter
- 4
- Best provider uptime, 24 h
- 100%
What Claude Fable 5.1 costs next to the alternatives
Every model it is compared with, on the same two workloads the matchup pages use. A short request is 2,000 tokens in and 500 out; a document summary is 20,000 in and 1,000 out.
| Model | Input / 1M | Output / 1M | 1,000 short requests | 100 document summaries | Context | Also takes |
|---|---|---|---|---|---|---|
| Claude Fable 5.1 (this model) | $10.00 | $50.00 | $45.00 | $25.00 | 1,000,000 | files, images |
| Claude Opus 5.5 | $4.00 | $20.00 | $18.00 | $10.00 | 1,000,000 | files, images |
| GPT-6 Astra | $10.00 | $50.00 | $45.00 | $25.00 | 1,050,000 | files, images |
Base rates from OpenRouter (checked 13 November 2026). Cache discounts, media, tools and extra reasoning tokens are not included. Model names link to the full matchup.
- Claude Fable 5.1 and GPT-6 Astra are the most expensive here for short requests, at $45.00 per 1,000. Claude Opus 5.5 handles the same 1,000 for $18.00.
- Very long prompts cost more on some models: GPT-6 Astra above 272,000 tokens. Both workloads above stay below those lengths.
Compare Claude Fable 5.1 with
Claude Fable 5.1 vs Claude Opus 5.5
Claude Fable 5.1 and Claude Opus 5.5 are Anthropic's two most capable models. The real question is whether Fable is worth paying more for: it costs 2.5 times as much per token, and Anthropic's own advice is to start with Opus.
See the comparison vs GPT-6 AstraClaude Fable 5.1 vs GPT-6 Astra
Claude Fable 5.1 and GPT-6 Astra are the premium models from Anthropic and OpenAI, and they list at the same price. If your prompts are short, cost won't decide this. If you send long documents or run agents on a cached context, Fable is much cheaper. If you need answers faster, only Astra sells a faster tier.
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