★ Anthropic · Frontier
Claude Fable 5.1 API Pricing Calculator
$10 per 1M input tokens, $50 per 1M output. Anthropic's top tier. Long-horizon agentic work and the hardest reasoning, where a wrong answer costs more than the tokens.
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- No signup
- Updated 7 Nov 2026
Price card · Claude Fable 5.1
Anthropic
- Input
- $10 / 1M
- Output
- $50 / 1M
- Cached input
- $0.25 / 1M
- Batch
- 50% off
- Context window
- Not published
- Tier
- Frontier
Workload
Repeated system prompt or docs
Jobs that can wait hours
Models
$ per 1M tokens, input / output
Monthly cost · 30 days
- Cheapest
- $4,200
- Claude Opus 5.5
- Priciest
- $10,500
- GPT-6 Astra
- Spread
- 2.5×
- priciest vs cheapest
| Per 1K users / mo | |||
|---|---|---|---|
Claude Opus 5.5Cheapest | $0.0140 | $4,200 | $2,100 |
Claude Fable 5.1 | $0.0350 | $10,500 | $5,250 |
GPT-6 Astra | $0.0350 | $10,500 | $5,250 |
Where the money is
If 60% of your traffic is simple enough for Claude Opus 5.5, routing it there instead of GPT-6 Astra saves about $3,780/month.
Caching half your input on GPT-6 Astra (a shared system prompt or document) would cut about $2,700/month.
You're looking at $4,200–$10,500/month.
Most AI products I audit can cut that 30–60% with routing, caching and shorter prompts.
What Claude Fable 5.1 costs in practice
List prices per million tokens are hard to reason about. Here is what common request types cost on Claude Fable 5.1, with no caching or batch discount applied.
| Request type | Tokens in / out | Per call | Per 1K calls | Per 1M calls |
|---|---|---|---|---|
| Classification or routing call | 400 / 10 | $0.00450 | $4.50 | $4,500 |
| Support chat reply | 1,500 / 250 | $0.0275 | $27.50 | $27,500 |
| RAG answer over your docs | 6,000 / 400 | $0.0800 | $80.00 | $80,000 |
| Long document summary | 40,000 / 1,000 | $0.4500 | $450 | $450,000 |
Pricing notes
Anthropic's top tier. Long-horizon agentic work and the hardest reasoning, where a wrong answer costs more than the tokens.
- Cache reads are billed at 0.025x the base input price.
- Refusals that arrive before any output are billed on this model.
Source: platform.claude.com, whats-new-fable-5-1. Verified 7 Nov 2026.
Compare
Or compare all 14 models in the full calculator.
How the math works
Every provider bills input tokens (your prompt, system prompt and retrieved documents) and output tokens (the reply) separately, per million. Output is usually 4–5× the input price, so chatty apps are output-heavy and RAG apps are input-heavy.
Two adjustments are applied automatically. Introductory prices (currently on some Gemini models) are used until their end date. Long-prompt surcharges kick in when your average input crosses the provider's threshold: 272K tokens on current OpenAI models, 100K on Claude Haiku 5.5.
Not modelled: cache-write premiums, priority or fast tiers, regional surcharges, image and audio tokens, and reasoning tokens a model spends before answering (they bill as output, so add them to your output estimate if you use extended thinking).
Claude Fable 5.1 questions
How much does Claude Fable 5.1 cost per 1M tokens?
Is Claude Fable 5.1 cheaper than GPT-6 Astra?
What is prompt caching and should I use it?
Why does my real bill differ from this estimate?
More from the workbench
Fine print
Tools: on the house.
Engineer: by the hour.
Knowing your AI bill was free. Cutting it in half isn't, but I'm cheaper than the overspend.
I'm Himanshu, an AI and full-stack engineer. I build MVPs, AI agents and the growth plumbing around them for early-stage startups.