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.
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 |
| Claude Haiku 3 |
— |
claude-3-haiku-20240307 |
Deprecated |
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 |
