Anthropic Claude Opus 4.5 20251101 (subscription) parameters
These are the parameters modelparams.dev tracks for Anthropic Claude Opus 4.5 20251101 when you reach it through a subscription rather than an API key. 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. | — |
Sampling
3 params
| Parameter | Type | Default | Description | Condition |
|---|---|---|---|---|
|
Temperature
temperature
|
number (0…1 step 0.1) | 1 | Controls randomness. Lower values make outputs more focused; higher values make them more varied. |
Not when thinking.type = "enabled" or top_p ≠ null
|
|
Top P
top_p
|
number (0…1 step 0.01) | 1 | Controls nucleus sampling by limiting generation to tokens whose cumulative probability reaches this value. |
Not when thinking.type = "enabled" or temperature ≠ null
|
|
Top K
top_k
|
integer (0…+∞) | 0 | Limits token sampling to the top K most likely next tokens. |
Not when thinking.type = "enabled"
|
Reasoning
4 params
| Parameter | Type | Default | Description | Condition |
|---|---|---|---|---|
|
Thinking mode
thinking.type
|
enum (disabled | enabled) | "disabled" | Controls the Anthropic thinking mode values supported by this model. | — |
|
Budget tokens
thinking.budget_tokens
|
integer (1024…+∞) | 4096 | Maximum token budget Anthropic may use for extended thinking before producing the final answer. |
Only when thinking.type = "enabled"
|
|
Thinking display
thinking.display
|
enum (summarized | omitted) | "summarized" | Controls whether Anthropic returns summarized or omitted thinking content. |
Only when thinking.type = "enabled"
|
|
Effort
output_config.effort
|
enum (low | medium | high) | "high" | Controls Anthropic response thoroughness and token spend. | — |
Anthropic Claude Opus 4.5 20251101 API parameters in brief
Anthropic Claude Opus 4.5 20251101 via subscription documents 8 API parameters, grouped by what they control:
-
Length:
max_tokensdefaults to 4096, minimum 1. -
Sampling:
temperaturedefaults to 1, range 0–1, not when thinking.type = "enabled" or top_p ≠ null;top_pdefaults to 1, range 0–1, not when thinking.type = "enabled" or temperature ≠ null;top_kdefaults to 0, minimum 0, not when thinking.type = "enabled". -
Reasoning:
thinking.typedefaults to "disabled", accepts "disabled", "enabled";thinking.budget_tokensdefaults to 4096, minimum 1024, only when thinking.type = "enabled";thinking.displaydefaults to "summarized", accepts "summarized", "omitted", only when thinking.type = "enabled";output_config.effortdefaults to "high", accepts "low", "medium", "high".
Frequently asked questions
- How many parameters does Anthropic Claude Opus 4.5 20251101 (subscription) accept?
- Anthropic Claude Opus 4.5 20251101 (subscription) accepts 8 API parameters: max_tokens, temperature, top_p, top_k, thinking.type, thinking.budget_tokens, and more.
- What is the default temperature for Anthropic Claude Opus 4.5 20251101 (subscription)?
- The default temperature for Anthropic Claude Opus 4.5 20251101 (subscription) is 1, within a valid range of 0 to 1.
- What is the default top_p for Anthropic Claude Opus 4.5 20251101 (subscription)?
- The default top_p for Anthropic Claude Opus 4.5 20251101 (subscription) is 1, within a valid range of 0 to 1.
- What is the default max_tokens for Anthropic Claude Opus 4.5 20251101 (subscription)?
- The default max_tokens for Anthropic Claude Opus 4.5 20251101 (subscription) is 4096, with a minimum of 1.
- What is the default top_k for Anthropic Claude Opus 4.5 20251101 (subscription)?
- The default top_k for Anthropic Claude Opus 4.5 20251101 (subscription) is 0, with a minimum of 0.
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