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claude-fable-5-1 API pricing & access

claude-fable-5-1 API pricing: $10 per 1M tokens. A high-capability Anthropic model for demanding reasoning, long-horizon agentic coding, an…

claude-fable-5-1 API access

A high-capability Anthropic model for demanding reasoning, long-horizon agentic coding, and multi-step knowledge work, with text and image input and text output. Available features and limits depend on the selected channel.

Compare supported API endpoints and capabilities, then access claude-fable-5-1 through the unified API gateway.

Category: text
Context length: 1000000 tokens
Maximum output: 128000 tokens
Supported APIs: Anthropic Messages API, OpenAI Chat Completions API
API endpoints: POST /v1/messages, POST /v1/chat/completions
Input modalities: text, image
Output modalities: text
Capabilities: vision, reasoning

claude-fable-5-1 API pricing

Base input price: $10 per 1M tokens
Base output price: $50 per 1M tokens

Base prices are shown in USD before group-specific adjustments. Open the live pricing page for current access-group prices.

About claude-fable-5-1

Claude Fable 5.1 targets demanding reasoning, coding and long-running knowledge work. The official model supports a 1M-token context, up to 128K output tokens, text/image input and text output, with adaptive thinking. Gateway parameters and limits depend on the selected route.

Official reference, checked 2026-10-13.

Use cases and prompting

Begin with a short request on the Anthropic endpoint listed here. Separate the goal, constraints, evidence and acceptance criteria. Validate adaptive-thinking parameters for the selected route and do not reuse thinking blocks across unrelated models or conversations. Record quality, usage and latency separately.

How to call claude-fable-5-1

claude-fable-5-1 is served through tbuy's unified gateway. Existing OpenAI or Anthropic SDK code keeps working: point base_url at https://modelsok.com and use your tbuy API key.

curl (OpenAI-compatible)

curl https://modelsok.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "claude-fable-5-1", "messages": [{"role": "user", "content": "Hello"}]}'

Python (openai SDK)

from openai import OpenAI

client = OpenAI(base_url="https://modelsok.com/v1", api_key="YOUR_API_KEY")
response = client.chat.completions.create(
    model="claude-fable-5-1",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)

Python (anthropic SDK)

from anthropic import Anthropic

client = Anthropic(base_url="https://modelsok.com", api_key="YOUR_API_KEY")
message = client.messages.create(
    model="claude-fable-5-1",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
)
print(message.content[0].text)

Frequently asked questions about claude-fable-5-1

What is claude-fable-5-1?

How do I call claude-fable-5-1?

Create an API key with access to claude-fable-5-1, then use the exact model ID and a supported endpoint from the API access section. Request fields depend on the selected endpoint.

How is claude-fable-5-1 priced?

Pricing depends on the selected provider group and the model billing unit. Refer to the current input, output, request, or media prices in the pricing section.

What is the context window of claude-fable-5-1?

The model catalog lists a context window of 1000000 tokens. Check the selected endpoint for request limits.

What is the maximum output of claude-fable-5-1?

The model catalog lists a maximum output of 128000 tokens. Your request settings may set a lower limit.

How should I evaluate claude-fable-5-1 for my project?

Start with the use cases and prompting guidance on this page, then evaluate the model with representative inputs from your project.

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