modelparams.dev

Anthropic Claude Opus 4 20250514 parameters

These are the parameters modelparams.dev tracks for Anthropic Claude Opus 4 20250514. 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"
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"
Top K
top_k
integer (0…+∞) 0 Limits token sampling to the top K most likely next tokens.
Not when thinking.type = "enabled"
Reasoning 3 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"

Anthropic Claude Opus 4 20250514 parameters in brief

Anthropic Claude Opus 4 20250514 documents 7 API parameters, grouped by what they control:

Resources

All Anthropic models Glossary Full catalog

Claude Opus 4 20250514 — JSON

The full model definition as served by the API. Copy it or open the endpoint directly.

{
  "$schema": "https://modelparams.dev/api/v1/schema.json",
  "provider": "anthropic",
  "authType": "api_key",
  "model": "claude-opus-4-20250514",
  "params": [
    {
      "path": "max_tokens",
      "label": "Max tokens",
      "description": "Maximum number of output tokens the model may generate.",
      "group": "generation_length",
      "type": "integer",
      "default": 4096,
      "range": {
        "min": 1
      }
    },
    {
      "path": "temperature",
      "label": "Temperature",
      "description": "Controls randomness. Lower values make outputs more focused; higher values make them more varied.",
      "group": "sampling",
      "applicability": {
        "except": [
          {
            "thinking.type": [
              "enabled"
            ]
          }
        ]
      },
      "type": "number",
      "default": 1,
      "range": {
        "min": 0,
        "max": 1,
        "step": 0.1
      }
    },
    {
      "path": "top_p",
      "label": "Top P",
      "description": "Controls nucleus sampling by limiting generation to tokens whose cumulative probability reaches this value.",
      "group": "sampling",
      "applicability": {
        "except": [
          {
            "thinking.type": [
              "enabled"
            ]
          }
        ]
      },
      "type": "number",
      "default": 1,
      "range": {
        "min": 0,
        "max": 1,
        "step": 0.01
      }
    },
    {
      "path": "top_k",
      "label": "Top K",
      "description": "Limits token sampling to the top K most likely next tokens.",
      "group": "sampling",
      "applicability": {
        "except": {
          "thinking.type": [
            "enabled"
          ]
        }
      },
      "type": "integer",
      "default": 0,
      "range": {
        "min": 0
      }
    },
    {
      "path": "thinking.type",
      "label": "Thinking mode",
      "description": "Controls the Anthropic thinking mode values supported by this model.",
      "group": "reasoning",
      "type": "enum",
      "default": "disabled",
      "values": [
        "disabled",
        "enabled"
      ]
    },
    {
      "path": "thinking.budget_tokens",
      "label": "Budget tokens",
      "description": "Maximum token budget Anthropic may use for extended thinking before producing the final answer.",
      "group": "reasoning",
      "applicability": {
        "only": {
          "thinking.type": "enabled"
        }
      },
      "type": "integer",
      "default": 4096,
      "range": {
        "min": 1024
      }
    },
    {
      "path": "thinking.display",
      "label": "Thinking display",
      "description": "Controls whether Anthropic returns summarized or omitted thinking content.",
      "group": "reasoning",
      "applicability": {
        "only": {
          "thinking.type": [
            "enabled"
          ]
        }
      },
      "type": "enum",
      "default": "summarized",
      "values": [
        "summarized",
        "omitted"
      ]
    }
  ]
}

Other Anthropic models

How to use

Building with an AI agent? Hit Copy to grab this whole guide as Markdown and paste it in — or point your agent straight at /llms.txt.

modelparams.dev is an open, community-maintained catalog of model parameters. Each entry shows the knobs you can turn — type, default, range, and the conditions that gate it.

The same model accessed via an API key and via a subscription usually exposes a different set of parameters. We list both as separate entries so the data stays honest.

Catalog API

The full catalog is static JSON, CORS-enabled, served from the edge.

curl https://modelparams.dev/api/v1/models.json

Each entry is keyed by provider/model for API-key variants; subscription variants append -subscription.

If you only need the params for one model contract, use the providerless endpoint. Subscription contracts are model slugs with -subscription.

curl https://modelparams.dev/api/v1/params/gpt-5.5.json
curl https://modelparams.dev/api/v1/params/gpt-5.5-subscription.json

Single model

curl https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-7.json
curl https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-7-subscription.json

JSON Schema

Every entry validates against a JSON Schema you can use in your editor or pipeline.

curl https://modelparams.dev/api/v1/schema.json

Add this header to any YAML you author for autocomplete in VS Code:

# yaml-language-server: $schema=https://modelparams.dev/api/v1/schema.json

Logos

Provider logos are available at /assets/logos/{provider}.svg where {provider} is the provider slug. They use currentColor so they inherit your text color.

curl https://modelparams.dev/assets/logos/anthropic.svg

Logos are sourced from the models.dev repo (MIT) and used under nominative fair use.

Contribute

The data lives in YAML under models/{provider}/{model}-{auth}.yaml in the GitHub repo. Open a PR; CI validates against the schema and rebuilds.

Edit on GitHub MIT licensed