Documentation Index
Fetch the complete documentation index at: /llms.txt
Use this file to discover all available pages before exploring further.
Anthropic’s newest Mythos-class flagship — improves on Fable 5 across the board, biggest gains in agentic coding and long-running agentic workflows. 1M context, 128K output, vision, file input, adaptive thinking.
claude-fable-5.1 — Anthropic’s newest Mythos-class flagship — improves on Fable 5 across the board, biggest gains in agentic coding and long-running agentic workflows. 1M context, 128K output, vision, file input, adaptive thinking.
| Field | Value |
|---|---|
| Model ID | claude-fable-5.1 |
| Best for | The hardest reasoning and long-horizon agentic work money can buy |
| Context window | 1M |
| Max output tokens | 128K |
| Input modalities | Text, Image, File |
| Output modalities | Text |
| Tool calling | Yes |
| Structured outputs | Yes |
| Prompt caching | No |
| Speed | Medium |
| Cost band | Premium |
| Release stage | Stable |
| Per 1M tokens | |
|---|---|
| Input | $13.50 |
| Output | $67.50 |
from openai import OpenAI
client = OpenAI(base_url="https://kymaapi.com/v1", api_key="kyma-...")
response = client.chat.completions.create(
model="claude-fable-5.1",
messages=[{"role": "user", "content": "..."}],
tools=[...], # function calling supported
)
curl "https://kymaapi.com/v1/models?recommended_for=chat&tools=true&quality_tier=frontier-open"