Claude Fable 5.1 API pricing
Claude Fable 5.1 is one of Anthropic's newest models. It costs $10 per million tokens it reads and $50 per million it writes, $20 on a mix of 3 read for each 1 written. Below are every price Anthropic lists for it, what 8 everyday jobs cost a month on it, and the models that do as well for less.
- Input
- $10 per million tokens read
- Output
- $50 per million tokens written
- On everyday work
- $20 per million, 3 read for each 1 written, the 15th cheapest of the 16 newest models
- Context window
- 1M tokens at once
- Capability score
- 165 on the Epoch Capabilities Index, GPT-5 is 150
Every Claude Fable 5.1 price, per million tokens
In US dollars, as Anthropic prints them on its price page.
| InputTokens the model reads | $10 |
|---|---|
| Cached inputRead again from the cache | $0.25 |
| Cache writePutting text in the cache | $12.50 |
| OutputTokens it writes, thinking included | $50 |
| Blend 3:13 tokens read for each 1 written | $20 |
| Batch inputAnswers collected later | $5 |
| Batch output | $25 |
| Context windowTokens it holds at once | 1M tokens |
| Longest answerTokens it writes in 1 reply | 128K tokens |
What 8 everyday jobs cost a month on Claude Fable 5.1
Each job at its usual number of runs a day, for 30 days, at the standard price. Open any job in the cost calculator to change its size, or to set it beside every other model.
| Job | A run | A month |
|---|---|---|
| A chat question300 in, 500 out, 100 a day | 2.8 cents | $84.00 |
| A hard question, with thinking300 in, 1,400 out, 100 a day | 7.3 cents | $219 |
| A long report, summarised60,000 in, 2,000 out, 20 a day | 70 cents | $420 |
| A 40-turn agent task2,800,000 in, 40,000 out, 10 a day | $5.43 | $1,629 |
| A support bot's reply4,000 in, 300 out, 2,000 a day | 3.6 cents | $2,130 |
| Sort a message into a category250 in, 5 out, 50,000 a day | 0.27 cents | $4,125 |
| Read an invoice into fields1,500 in, 250 out, 1,000 a day | 2.8 cents | $825 |
| Review a pull request25,000 in, 4,500 out, 50 a day | 48 cents | $713 |
Cheaper models that score as well as Claude Fable 5.1
Newest models with a lower blend price whose Epoch Capabilities Index score is about as high or higher, cheapest first. A score is an average over many benchmarks, so test one on your own work before you switch.
- Claude Sonnet 5.5Anthropic
$4
per million at 3:1, score 164
Side by side - Gemini 4 ArgonGoogle
$4
per million at 3:1, score 165
Side by side - GPT-6.1 SolOpenAI
$4
per million at 3:1, score 166
Side by side - Claude Opus 5.5Anthropic
$8
per million at 3:1, score 167
Side by side
Compare Claude Fable 5.1
Both price lists side by side, and what the same 8 jobs cost on each.
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Every maker prints 2 main prices: one for the tokens a model reads (input) and one for the tokens it writes (output), each per million tokens. Writing costs more on almost every model, so a job that reads a long document and writes a line pays mostly the input price, and a chat that writes paragraphs pays mostly the output price. The blend, 3 tokens read for each 1 written, is one figure for ranking models on everyday work.
The other prices lower or raise the bill. Text read again from a cache costs a fraction of the input price, so a long system prompt or document sent with every request gets cheaper after the first. Work that can wait a day costs about half on a batch where the maker offers one. Some models charge more for every token once a prompt passes a set length.
Thinking is billed as output, and the same text is not the same number of tokens on every model, so the price per token is only the start. Each job below is priced the way the cost calculator prices it, at its usual runs a day for 30 days; open one to change its size, or compare the model with another side by side.
Questions
- How much does Claude Fable 5.1 cost?
- Claude Fable 5.1 costs $10 per million input tokens, the text it reads, and $50 per million output tokens, the text it writes, thinking included. On a mix of 3 tokens read for each 1 written, that is $20 per million.
- How much does cached input cost on Claude Fable 5.1?
- Text Claude Fable 5.1 reads again from the cache costs $0.25 per million tokens, against $10 the first time. Putting text in the cache costs $12.50 per million, so a long prompt sent again and again costs far less after the first time.
- Does Claude Fable 5.1 have a batch price?
- Yes. With a batch, where you send many requests and collect the answers later instead of at once, Claude Fable 5.1 costs $5 per million tokens read and $25 per million written.
- What is the context window of Claude Fable 5.1?
- Claude Fable 5.1 holds 1M tokens at once, about 1,500 pages of English text, and writes up to 128K tokens in one answer. The window holds your instructions, the files you attach, the conversation so far and the answer.
- How good is Claude Fable 5.1?
- Claude Fable 5.1 scores 165 on the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, with a range of doubt from 162 to 168 (GPT-5 is 150). One score is an average; test it on 10 tasks of your own.
- Is there a cheaper model as good as Claude Fable 5.1?
- Claude Sonnet 5.5 from Anthropic scores 164 on the Epoch Capabilities Index, about as well or better, and costs $4 per million on a mix of 3 tokens read for each 1 written: Claude Fable 5.1 costs 5 times as much. Test both on your own work before you switch.
- Where does Claude Fable 5.1 rank on price?
- Claude Fable 5.1 is the 15th cheapest of the 16 newest models we list, by the price of 3 tokens read for each 1 written.
- What does a support bot cost a month on Claude Fable 5.1?
- At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, a support bot costs 3.6 cents a reply on Claude Fable 5.1, $2,130 a month.
- What does an AI agent task cost on Claude Fable 5.1?
- One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs $5.43 on Claude Fable 5.1. At 10 tasks a day that is $1,629 a month.
Sources