---
title: "Claude Fable 5.1 API pricing: ⁨$10⁩ in, ⁨$50⁩ out · DotsAgent"
description: "Claude Fable 5.1 by Anthropic: price per million input, cached and output tokens, context window, agent features and what a real agent task costs on it."
url: https://dotsagent.io/models/claude-fable-5-1
---

[Anthropic](https://dotsagent.io/providers/anthropic)

· Flagship

# Claude Fable 5.1 API pricing and specs

Anthropic's top tier above Opus, with always-on adaptive thinking, per-message effort and progress updates between tool calls.

Input

$10

Cached input

$0.25

Output

$50

US dollars per million tokens, standard tier, short-prompt rate

Cache reads cost $0.25 per million and 5-minute cache writes $12.50. Fable requires 30-day data retention, so it is not available under zero data retention without approval, and its output text carries a watermark.

## Spec sheet

- **API model string**: `claude-fable-5-1`
- **Provider**: [Anthropic](https://dotsagent.io/providers/anthropic)
- **Context**: 1M tokens
- **Max output**: 128K tokens
- **Released**: September 1, 2026
- **Batch API**: 50% off, results within hours
- **Documented agent features**: Tool callingStructured outputComputer useAdjustable reasoning

## What a task costs

Four reference workloads priced at this model's list rates, with caching applied after the first call. Your numbers will differ; the calculator lets you change every assumption.

| Workload | Per task | Per 1,000 tasks |
| --- | --- | --- |
| Support bot 4 calls, short tool lookups | $0.266 | $266 |
| Coding agent 30 calls, files and test output | $7.76 | $7,761 |
| Browser agent 25 calls, screenshots and page text | $6.36 | $6,357 |
| Research agent 15 calls, long search results | $6.25 | $6,248 |

[Change the assumptions](https://dotsagent.io/cost#model=claude-fable-5-1)

## Other Anthropic models

- [Claude Opus 5.5](https://dotsagent.io/models/claude-opus-5-5): $4 / $20

- [Claude Sonnet 5.5](https://dotsagent.io/models/claude-sonnet-5-5): $2 / $10

- [Claude Haiku 4.5](https://dotsagent.io/models/claude-haiku-4-5): $1 / $5

## Similar cost elsewhere

Models from other providers whose cost on the 30-step coding workload is closest to this one.

- [GPT-6 Astra](https://dotsagent.io/models/gpt-6-astra): $9.89 per coding task

- [Mistral Medium 3.5](https://dotsagent.io/models/mistral-medium-3-5): $5.31 per coding task

- [Kimi K3](https://dotsagent.io/models/kimi-k3): $2.97 per coding task

- [Grok 4.7](https://dotsagent.io/models/grok-4-7): $2.68 per coding task

## Sources

1. [platform.claude.com](https://platform.claude.com/docs/en/about-claude/models/overview)/docs/en/about-claude/models/overview
2. [platform.claude.com](https://platform.claude.com/docs/en/about-claude/pricing)/docs/en/about-claude/pricing
3. [platform.claude.com](https://platform.claude.com/docs/en/release-notes/overview)/docs/en/release-notes/overview
4. [anthropic.com](https://www.anthropic.com/pricing)/pricing

Independent reference for people who build AI agents. Not affiliated with any vendor named here.

© 2026 DotsAgent · Facts checked October 1, 2026