modelparams.dev
Reasoning enum 18 models

Thinking display thinking.display

Controls whether Anthropic returns summarized or omitted thinking content.

Type
enum
Default
varies by model

thinking.display by model

The exact type, default, range, and conditions for thinking.display on each model that documents it.

Model Provider Type Default Range / values Condition
Claude Fable 5 Anthropic enum "omitted" summarized | omitted
Only when thinking.type = "adaptive"
Claude Fable 5 Subscription Anthropic enum "omitted" summarized | omitted
Only when thinking.type = "adaptive"
Claude Opus 4 20250514 Anthropic enum "summarized" summarized | omitted
Only when thinking.type = "enabled"
Claude Opus 4 20250514 Subscription Anthropic enum "summarized" summarized | omitted
Only when thinking.type = "enabled"
Claude Opus 4.1 20250805 Anthropic enum "summarized" summarized | omitted
Only when thinking.type = "enabled"
Claude Opus 4.1 20250805 Subscription Anthropic enum "summarized" summarized | omitted
Only when thinking.type = "enabled"
Claude Opus 4.5 20251101 Anthropic enum "summarized" summarized | omitted
Only when thinking.type = "enabled"
Claude Opus 4.5 20251101 Subscription Anthropic enum "summarized" summarized | omitted
Only when thinking.type = "enabled"
Claude Opus 4.6 Anthropic enum "summarized" summarized | omitted
Only when thinking.type ∈ {"adaptive", "enabled"}
Claude Opus 4.6 Subscription Anthropic enum "summarized" summarized | omitted
Only when thinking.type ∈ {"adaptive", "enabled"}
Claude Opus 4.7 Anthropic enum "omitted" summarized | omitted
Only when thinking.type = "adaptive"
Claude Opus 4.7 Subscription Anthropic enum "omitted" summarized | omitted
Only when thinking.type = "adaptive"
Claude Opus 4.8 Anthropic enum "omitted" summarized | omitted
Only when thinking.type = "adaptive"
Claude Opus 4.8 Subscription Anthropic enum "omitted" summarized | omitted
Only when thinking.type = "adaptive"
Claude Sonnet 4 20250514 Anthropic enum "summarized" summarized | omitted
Only when thinking.type = "enabled"
Claude Sonnet 4 20250514 Subscription Anthropic enum "summarized" summarized | omitted
Only when thinking.type = "enabled"
Claude Sonnet 4.6 Anthropic enum "summarized" summarized | omitted
Only when thinking.type ∈ {"adaptive", "enabled"}
Claude Sonnet 4.6 Subscription Anthropic enum "summarized" summarized | omitted
Only when thinking.type ∈ {"adaptive", "enabled"}

Models without thinking.display documented yet

These models don't list thinking.display in the catalog. That may mean the provider doesn't accept it, or it simply hasn't been added yet — the data is community-maintained.

Related reasoning parameters

Resources

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