Anthropic: Claude Fable 5.1: AI model
Claude Fable 5.1 is an upgraded Claude model for agentic coding and knowledge work from Anthropic with a 1M-token context window. Reachable from inside Iran through Hormouz.
- Context window:
- 1,000,000 tokens
- Input:
- $10/1M tokens
- Output:
- $50/1M tokens
- Type:
- text, image
- Vision
- Tools
- Streaming
- Long context
Thinking levels: Always thinks · max · xhigh · high · medium · low
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the largest gains in agentic coding, long-running agent workflows and knowledge work, especially long refactors, front-end and visual code, and finance and analysis. Its plans and summaries are shorter and clearer than Fable 5's. It is meant as a drop-in upgrade for Fable 5 and is worth testing alongside Opus on reasoning-heavy work.
It accepts text, image and file (PDF) input and returns text, and supports tool calling, structured JSON output and streaming. It always reasons before answering, and you choose how hard it thinks with the reasoning effort setting. Claude Fable 5.1 is commonly used for long code refactors, front-end development, agent workflows, financial analysis and knowledge work. Hormouz serves it behind an OpenAI-compatible API: point your base URL at Hormouz, drop in a Hormouz key, and existing OpenAI SDK code runs without changes.
Pricing is usage-based: $10 per million input tokens and $50 per million output tokens. There is no fixed monthly fee, and you pay only for the tokens you use. Hormouz provides stable access to the model from inside Iran, with no foreign credit card or circumvention tooling required.
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Quickstart
curl https://api.hormouz.net/v1/chat/completions \
-H "Authorization: Bearer ng-YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "anthropic/claude-fable-5.1",
"messages": [{"role": "user", "content": "Hello!"}]
}'Specs
| Vendor | Anthropic |
|---|---|
| Type | Text, Image |
| Context window | 1,000,000 tokens |
| Pricing | $10.00/M in · $50.00/M out |
| API | Chat Completions |
| Capabilities | Streaming · Vision · Tools |
Benchmarks
Reasoning
Coding
Agentic
Source: Artificial Analysis
Design Arena
How Design Arena works ↗Metrics sourced from Design Arena
Code example
curl https://api.hormouz.net/v1/chat/completions \
-H "Authorization: Bearer ng-YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "anthropic/claude-fable-5.1",
"messages": [{"role": "user", "content": "Hello!"}]
}'from openai import OpenAI
client = OpenAI(api_key="ng-YOUR_API_KEY", base_url="https://api.hormouz.net/v1")
response = client.chat.completions.create(
model="anthropic/claude-fable-5.1",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({ apiKey: "ng-YOUR_API_KEY", baseURL: "https://api.hormouz.net/v1" });
const response = await client.chat.completions.create({
model: "anthropic/claude-fable-5.1",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);Buy the Anthropic: Claude Fable 5.1 API, paid in rial
- Buy credit with an Iranian bank card; no foreign card or account needed.
- One Hormouz key reaches Anthropic: Claude Fable 5.1 and 600+ other models, and you pay only for what you use.
- No VPN and no risk of a banned account; just change the base URL to api.hormouz.net/v1.
Use via Hormouz
Connect to this model and 600+ others with one API key, then see usage down to each request.
Request company accessFAQ
- How much does Claude Fable 5.1 cost?
- Pricing is usage-based: $10 per million input tokens and $50 per million output tokens. There is no fixed monthly fee, and you pay only for the tokens you use.
- How do I access Claude Fable 5.1 from inside Iran?
- Create an account on Hormouz and generate an API key. Hormouz provides a stable path to the model from inside Iran, with no foreign credit card or circumvention tooling required.
- Is Claude Fable 5.1 compatible with OpenAI code?
- Yes. Hormouz exposes an OpenAI-compatible API. Point your base URL at Hormouz and swap in your Hormouz key. Your existing SDKs and code run without a rewrite.
- What context window and capabilities does Claude Fable 5.1 have?
- It has a 1M-token context window, accepts text, image and file (PDF) input, and supports tool calling, structured JSON output and streaming. It always reasons before answering, and you choose how hard it thinks with the reasoning effort setting.
- What is Claude Fable 5.1 good for?
- Typical uses are long code refactors, front-end development, agent workflows, financial analysis and knowledge work.
- Claude Fable 5.1 or GPT-6 Astra: which should I use?
- Both are top-tier models at the same price per token. Fable 5.1 is especially strong at long refactors, front-end code and finance work; GPT-6 Astra is OpenAI's flagship for the hardest reasoning and professional tasks. Compare their benchmarks side by side on our comparison page and test both on your own prompts.
Updated 2026-10-13