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The Official Claude Model Lineup
Official Claude Models Overview
Anthropic provides a focused family of frontier models across the Series 5 generation and hybrid predecessors, each engineered for distinct intelligence, speed, and cost profiles:
| Model | Model ID | Context Window | Max Output | Pricing (In / Out per MTok) | Lifecycle Status | Primary Use Case |
|---|---|---|---|---|---|---|
| Claude Fable 5.1 | claude-fable-5-1 | 1M tokens | 128K tokens | $10.00 / $50.00 | ● ACTIVE (Flagship) | Demanding reasoning, long-horizon agentic work, multi-day projects (always-on adaptive thinking) |
| Claude Opus 5.5 | claude-opus-5-5 | 1M tokens | 128K tokens | $5.00 / $25.00 | ● ACTIVE (Flagship) | Next-generation deep systems architecture, autonomous agentic workflows, and pinnacle mathematical proof synthesis |
| Claude Opus 5 | claude-opus-5 | 1M tokens | 128K tokens | $5.00 / $25.00 | ● ACTIVE | Flagship agentic coding, systems engineering, enterprise architecture, adaptive thinking |
| Claude Sonnet 5.5 | claude-sonnet-5-5 | 1M tokens | 128K tokens | $2.00 / $10.00 | ● ACTIVE (Recommended) | Frontier benchmark for daily coding, multi-tool agentic workflows, and low-latency adaptive thinking |
| Claude Sonnet 5 | claude-sonnet-5 | 1M tokens | 128K tokens | $2.00 / $10.00 | ● ACTIVE | Best balance of speed and intelligence, everyday coding, default adaptive thinking |
| Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 200K tokens | 64K tokens | $1.00 / $5.00 | ● ACTIVE (Retirement not sooner than 2026-10-15) | Ultra-fast, near-frontier intelligence for high-throughput classification and routing |
| Claude 3.7 Sonnet | claude-3-7-sonnet-20250219 | 200K tokens | 128K tokens (with beta header) / 8K default | $3.00 / $15.00 | ● ACTIVE | Frontier hybrid reasoning pioneer with configurable thinking budget |
| Claude 3.5 Sonnet | claude-3-5-sonnet-20241022 | 200K tokens | 8,192 tokens | $3.00 / $15.00 | ● ACTIVE (Predecessor) | Legacy industry-standard coding and computer use predecessor |
| Claude 3 Opus | claude-3-opus-20240229 | 200K tokens | 4,096 tokens | $15.00 / $75.00 | ● ACTIVE (Predecessor) | Legacy deep academic research predecessor |
| Claude 2.0 / 2.1 | claude-2.0 / claude-2.1 | 100K - 200K tokens | 4,096 tokens | $8.00 / $24.00 | ■ RETIRED / SHUT DOWN | Officially retired; developers must migrate to Claude 3.5/3.7 or Series 5 models via Messages API |
| Claude Instant 1.2 | claude-instant-1.2 | 100K tokens | 4,096 tokens | $0.80 / $2.40 | ■ RETIRED / SHUT DOWN | Officially retired; migrate to Claude Haiku (vastly superior latency and reasoning) |
| Text Completions (/v1/complete) | Legacy API endpoint | N/A | N/A | N/A | ■ SHUT DOWN | Retired legacy endpoint; all workloads must route to /v1/messages |
The Series 5 Architectural Leap
Anthropic's Series 5 generation (including the latest Claude Opus 5.5 and Claude Sonnet 5.5 iterations) introduces standard 1M token context windows and 128K max output tokens across flagship tiers. Rather than requiring manual budget_tokens allocation, Series 5 models feature Adaptive Thinking by default, autonomously scaling reasoning depth to match problem complexity.
⌨ HANDS-ON LABQuery the Live Models Catalog
⭐ +100 XPVerify which Claude models are active on your account. Query the official /v1/models endpoint via REST.
1Send a GET request to https://api.anthropic.com/v1/models with your API key.
OBJECTIVE 1 / 1 — type "hint" if stuck
SYNAPSE VERIFICATION
QUERY 1 // 5
Which model is Anthropic's flagship model for demanding reasoning and long-horizon agentic workflows?
Claude Haiku 4.5
Claude Fable 5.1 (claude-fable-5-1)
Claude 3.5 Haiku
Claude Instant