Obtaining a List of Claude Models Using the Anthropic API

By using the Anthropic API's /v1/models endpoint, you can programmatically retrieve a list of available Claude models along with their specifications.

How to Call the API

To retrieve it using PowerShell, use the following:

$uri = "https://api.anthropic.com/v1/models"
$headers = @{
    "x-api-key"         = $env:ANTHROPIC_API_KEY
    "anthropic-version" = "2023-06-01"
}

$response = Invoke-RestMethod -Uri $uri -Method Get -Headers $headers
$response.data | ConvertTo-Json -Depth 10

To retrieve it using curl, use the following:

curl https://api.anthropic.com/v1/models \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01"

Retrieval Results (As of May 2026)

Model	Model ID	Release Date	Max Input	Max Output
Claude Opus 4.7	claude-opus-4-7	2026-04-14	1M	128K
Claude Sonnet 4.6	claude-sonnet-4-6	2026-02-17	1M	128K
Claude Opus 4.6	claude-opus-4-6	2026-02-04	1M	128K
Claude Opus 4.5	claude-opus-4-5-20251101	2025-11-24	200K	64K
Claude Haiku 4.5	claude-haiku-4-5-20251001	2025-10-15	200K	64K
Claude Sonnet 4.5	claude-sonnet-4-5-20250929	2025-09-29	1M	64K
Claude Opus 4.1	claude-opus-4-1-20250805	2025-08-05	200K	32K
Claude Opus 4	claude-opus-4-20250514	2025-05-22	200K	32K
Claude Sonnet 4	claude-sonnet-4-20250514	2025-05-22	1M	64K

Feature Support Status

The availability of features for each model is as follows:

Model	Batch Processing	Code Execution	Effort Control	Compact	Thinking Mode
Claude Opus 4.7	○	○	○	○	only adaptive
Claude Sonnet 4.6	○	○	○	○	enabled / adaptive
Claude Opus 4.6	○	○	○	○	enabled / adaptive
Claude Opus 4.5	○	○	○ (max not supported)	✕	only enabled
Claude Haiku 4.5	○	✕	✕	✕	only enabled
Claude Sonnet 4.5	○	○	✕	✕	only enabled
Claude Opus 4.1	○	✕	✕	✕	only enabled
Claude Opus 4	○	✕	✕	✕	only enabled
Claude Sonnet 4	○	✕	✕	✕	only enabled

Explanation of Each Feature

• Batch Processing: Allows for the processing of large requests in bulk using an asynchronous batch API, available at 50% off the on-demand rate.
• Code Execution: The model can execute code in a sandbox environment.
• Effort Control: Adjusts the amount of thought with options for low, medium, high, and max, allowing control over cost and accuracy trade-offs.
• Compact: Context management feature that makes it possible to compress long conversations to use tokens efficiently (compact_20260112).
• Thinking Mode: Availability of Extended Thinking mode. enabled indicates always on, while adaptive means the model decides automatically.

Starting from the latest 4.6 generation (Opus 4.6, Sonnet 4.6), Compact is available and Effort Control is also supported. Note that these features are not available when using models from the 4.5 generation or earlier.

References

• Models overview – Anthropic API Docs
• List Models API – Anthropic API Reference