Anthropic
4 params
Anthropic Claude Fable 5 parameters
These are the parameters modelparams.dev tracks for Anthropic Claude Fable 5. Each row gives the type, default, valid range or values, and the conditions that gate it. It's the same data the JSON API serves.
Length
1 param
| Parameter | Type | Default | Description | Condition |
|---|---|---|---|---|
|
Max tokens
max_tokens
|
integer (1…+∞) | 4096 | Maximum number of output tokens the model may generate. | — |
Reasoning
3 params
| Parameter | Type | Default | Description | Condition |
|---|---|---|---|---|
|
Thinking mode
thinking.type
|
enum (adaptive) | — | Only adaptive thinking is supported; omit the parameter entirely to run without thinking (an explicit disabled value is rejected). | — |
|
Thinking display
thinking.display
|
enum (summarized | omitted) | "omitted" | Controls whether Anthropic returns summarized or omitted thinking content. |
Only when thinking.type = "adaptive"
|
|
Effort
output_config.effort
|
enum (low | medium | high | xhigh | max) | "high" | Controls Anthropic response thoroughness and token spend. | — |
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