Claude Fable 5.1

proprietary

For demanding reasoning and long-horizon agentic work

Intelligence
Reasoning
Context
1M
Max output
128K
Input price
$10/1M tokens
Output price
$50/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDclaude-fable-5-1
Provider OpenCode Zen
Creator Anthropic
Familyclaude-fable
Licenseproprietary
Statusactive
Typechat
Input modalitiestext
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window1M tokens
Max input—
Max output128K tokens
Reasoning tokens—
Knowledge cutoff
Training data cutoff
Release date
Sourceofficial

Pricing

Input
$10
Output
$50
Cache write
$12.5
Cache read
$0.25
Batch in
—
Batch out
—

Family Comparison: claude-fable

ModelContextMax outPricing
Claude Fable 5.11M128K$10$50
Claude Fable 51M128K$10$50

API

GET/v1/models/opencode/claude-fable-5-1