Claude Fable 5.1
FrontierVisionToolsAnthropic · Released September 2026
It belongs to Anthropic's Claude family: Opus is the deep-capability tier and Claude Opus 5.5 leads it, Sonnet balances quality and speed, Fable is the most recently introduced line, and Haiku is the light tier.
Facts and pricing
- Provider
- Anthropic
- Context window
- 1M tokens
- Input price
- 120 credits / 1M tokens ($10.00 raw)
- Output price
- 600 credits / 1M tokens ($50.00 raw)
- Vision (image input)
- Yes
- Tool calling
- Yes
- Extended reasoning
- No
Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.
Try Claude Fable 5.1 now
What Claude Fable 5.1 is best for
- Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
- Very long documents and codebases: a 1M-token window fits entire books or repositories in one conversation
- Working with images: screenshots, charts, photos and scanned documents alongside text
- Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows
Example prompts
Prompts that suit a frontier model like Claude Fable 5.1:
- Review this business plan and give me the three hardest questions an investor would ask
- Rewrite this announcement so it lands with both engineers and executives
- I am choosing between two job offers, help me think through the tradeoffs
- Draft a technical design doc for a rate limiter, including failure modes
Anthropic family
| Model | Context | Input cr/M | Output cr/M | Released |
|---|---|---|---|---|
| Claude Haiku 5.5 | 1M | 1.2 | 6.0 | October 2026 |
| Claude Sonnet 5.5 | 1M | 24.0 | 120 | September 2026 |
| Claude Opus 5.5 (batch) | 1M | 24.0 | 120 | September 2026 |
| Claude Opus 5.5 | 1M | 48.0 | 240 | September 2026 |
| Claude Fable 5.1 | 1M | 120 | 600 | September 2026 |
| Claude Fable 5.1 (batch) | 1M | 60.0 | 300 | September 2026 |
| Claude Opus 5 | 1M | 60.0 | 300 | July 2026 |
| Claude Opus 5 (batch) | 1M | 30.0 | 150 | July 2026 |
| Claude Sonnet 5 | 1M | 24.0 | 120 | June 2026 |
| Claude Fable 5 | 1M | 120 | 600 | June 2026 |
Compare Claude Fable 5.1
- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Opus 5.5 vs Claude Opus 5
- Claude Opus 5.5 vs GPT-6 Astra
Frequently asked questions
- What is Claude Fable 5.1?
- Claude Fable 5.1 is an AI model by Anthropic.
- How much does Claude Fable 5.1 cost on Zeplik?
- Input tokens cost 120 credits per million and output tokens 600 credits per million (1 credit = $0.10; the raw provider rates are $10.00 and $50.00 per million). New accounts start with free credits.
- How long can a conversation with Claude Fable 5.1 be?
- Claude Fable 5.1 has a 1M-token context window (1,000,000 tokens), which covers the conversation plus any documents you attach.
- Does Claude Fable 5.1 support images and tools?
- Claude Fable 5.1 accepts image input and supports tool calling.
Related models
Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work such as summarization, subagents, and browser use.
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade.
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work.
More you can do with Claude Fable 5.1
- 468 AI skillsReady-to-run expert methods for writing, data, code and more, each running on Claude Fable 5.1 or any model you pick.
- 997 integrationsConnect Gmail, Slack, GitHub, Notion and hundreds more so the assistant can work in your apps.
- Simple pricingPlus, Pro and Max plans with a monthly credit allowance that works across every model.