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A

Claude 5 Fable

Claude 5 Fable, a language model from Anthropic.
modelOverride: { model: "claude-fable-5" }
Anthropic·Released April 2026
Pricing
Input
$10.00 / 1M
Output
$50.00 / 1M
Cached input
$1.00 / 1M
Cached input
$12.50 / 1M
Cached input
$20.00 / 1M
Specifications
Context window
1,000,000 tokens
Max output
128,000 tokens
Released
April 2026
Capabilities
VisionLarge contextReasoningToolsMCP
Parameters
Model options, passed in modelOverride.config.
ParameterTypeDefaultRange / options
effort
Controls reasoning depth. Higher effort improves quality but uses more tokens and is slower. Recommended: High for most tasks, Extra High or Max for the hardest coding and agentic work, Medium or Low for routine, latency-sensitive tasks.
Selecthighlowmediumhighxhighmax
toolsTools——
mcpServersMCP servers——
Use this model
await mindstudio.generateText({
  message: "...",
  modelOverride: {
    model: "claude-fable-5",
    config: {
      effort: "high",
    },
  },
});