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Claude Model Catalog

Only use exact model IDs listed in this file. Never guess or construct model IDs — incorrect IDs will cause API errors. Use aliases wherever available. For the latest information, WebFetch the Models Overview URL in shared/live-sources.md, or query the Models API directly (see Programmatic Model Discovery below).

Programmatic Model Discovery

For live capability data — context window, max output tokens, feature support (thinking, vision, effort, structured outputs, etc.) — query the Models API instead of relying on the cached tables below. Use this when the user asks "what's the context window for X", "does model X support vision/thinking/effort", "which models support feature Y", or wants to select a model by capability at runtime.

m = client.models.retrieve("claude-opus-4-6")
m.id                 # "claude-opus-4-6"
m.display_name       # "Claude Opus 4.6"
m.max_input_tokens   # context window (int)
m.max_tokens         # max output tokens (int)

# capabilities is an untyped nested dict — bracket access, check ["supported"] at the leaf
caps = m.capabilities
caps["image_input"]["supported"]                       # vision
caps["thinking"]["types"]["adaptive"]["supported"]     # adaptive thinking
caps["effort"]["max"]["supported"]                     # effort: max (also low/medium/high)
caps["structured_outputs"]["supported"]
caps["context_management"]["compact_20260112"]["supported"]

# filter across all models — iterate the page object directly (auto-paginates); do NOT use .data
[m for m in client.models.list()
 if m.capabilities["thinking"]["types"]["adaptive"]["supported"]
 and m.max_input_tokens >= 200_000]

Top-level fields (id, display_name, max_input_tokens, max_tokens) are typed attributes. capabilities is a dict — use bracket access, not attribute access. The API returns the full capability tree for every model with supported: true/false at each leaf, so bracket chains are safe without .get() guards. TypeScript SDK: same method names, also auto-paginates on iteration.

Raw HTTP

curl https://api.anthropic.com/v1/models/claude-opus-4-6 \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01"
{
  "id": "claude-opus-4-6",
  "display_name": "Claude Opus 4.6",
  "max_input_tokens": 1000000,
  "max_tokens": 128000,
  "capabilities": {
    "image_input": {"supported": true},
    "structured_outputs": {"supported": true},
    "thinking": {"supported": true, "types": {"enabled": {"supported": true}, "adaptive": {"supported": true}}},
    "effort": {"supported": true, "low": {"supported": true}, …, "max": {"supported": true}},
    …
  }
}

Current Models (recommended)

Friendly Name Alias (use this) Full ID Context Max Output Status
Claude Opus 4.6 claude-opus-4-6 — 200K (1M beta) 128K Active
Claude Sonnet 4.6 claude-sonnet-4-6 - 200K (1M beta) 64K Active
Claude Haiku 4.5 claude-haiku-4-5 claude-haiku-4-5-20251001 200K 64K Active

Model Descriptions

  • Claude Opus 4.6 — Our most intelligent model for building agents and coding. Supports adaptive thinking (recommended), 128K max output tokens (requires streaming for large outputs). 1M context window available in beta via context-1m-2025-08-07 header.
  • Claude Sonnet 4.6 — Our best combination of speed and intelligence. Supports adaptive thinking (recommended). 1M context window available in beta via context-1m-2025-08-07 header. 64K max output tokens.
  • Claude Haiku 4.5 — Fastest and most cost-effective model for simple tasks.

Legacy Models (still active)

Friendly Name Alias (use this) Full ID Status
Claude Opus 4.5 claude-opus-4-5 claude-opus-4-5-20251101 Active
Claude Opus 4.1 claude-opus-4-1 claude-opus-4-1-20250805 Active
Claude Sonnet 4.5 claude-sonnet-4-5 claude-sonnet-4-5-20250929 Active
Claude Sonnet 4 claude-sonnet-4-0 claude-sonnet-4-20250514 Active
Claude Opus 4 claude-opus-4-0 claude-opus-4-20250514 Active

Deprecated Models (retiring soon)

Friendly Name Alias (use this) Full ID Status Retires
Claude Haiku 3 — claude-3-haiku-20240307 Deprecated Apr 19, 2026

Retired Models (no longer available)

Friendly Name Full ID Retired
Claude Sonnet 3.7 claude-3-7-sonnet-20250219 Feb 19, 2026
Claude Haiku 3.5 claude-3-5-haiku-20241022 Feb 19, 2026
Claude Opus 3 claude-3-opus-20240229 Jan 5, 2026
Claude Sonnet 3.5 claude-3-5-sonnet-20241022 Oct 28, 2025
Claude Sonnet 3.5 claude-3-5-sonnet-20240620 Oct 28, 2025
Claude Sonnet 3 claude-3-sonnet-20240229 Jul 21, 2025
Claude 2.1 claude-2.1 Jul 21, 2025
Claude 2.0 claude-2.0 Jul 21, 2025

Resolving User Requests

When a user asks for a model by name, use this table to find the correct model ID:

User says... Use this model ID
"opus", "most powerful" claude-opus-4-6
"opus 4.6" claude-opus-4-6
"opus 4.5" claude-opus-4-5
"opus 4.1" claude-opus-4-1
"opus 4", "opus 4.0" claude-opus-4-0
"sonnet", "balanced" claude-sonnet-4-6
"sonnet 4.6" claude-sonnet-4-6
"sonnet 4.5" claude-sonnet-4-5
"sonnet 4", "sonnet 4.0" claude-sonnet-4-0
"sonnet 3.7" Retired — suggest claude-sonnet-4-5
"sonnet 3.5" Retired — suggest claude-sonnet-4-5
"haiku", "fast", "cheap" claude-haiku-4-5
"haiku 4.5" claude-haiku-4-5
"haiku 3.5" Retired — suggest claude-haiku-4-5
"haiku 3" Deprecated — suggest claude-haiku-4-5