Claude AI Available Models: All Supported Models, Version Differences, Capabilities Comparison, And Access Requirements

Claude AI provides a family of advanced language models, each tuned for different strengths, efficiency levels, and use cases. Understanding the available models, key version differences, their core capabilities, and access requirements allows users and developers to select the optimal Claude experience for research, coding, enterprise applications, or high-volume AI workflows.

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Claude AI Supports Multiple Active Models Across The 4.5, 4.x, And 3.x Generations.

Claude’s current model lineup includes the flagship Claude 4.5 series—Opus 4.5, Sonnet 4.5, and Haiku 4.5—alongside select Claude 4 and 3 models that remain active in the API and certain cloud marketplaces.

Each model is available under a unique API version identifier as well as a shorter alias that points to the latest release in the model’s family. This dual identification system helps users lock in a specific model version or always access the latest update.

Deprecated models, including prior Claude 3 and 2 variants, are being phased out with published retirement timelines.

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All Supported Claude AI Models And Identifiers

Model Name	API Alias	Versioned Model ID Example	Context Window	Positioning
Claude Opus 4.5	claude-opus-4-5	claude-opus-4-5-20251101	200K	Maximum capability, advanced reasoning
Claude Sonnet 4.5	claude-sonnet-4-5	claude-sonnet-4-5-20250929	200K (1M beta)	Balanced, best for coding and agents
Claude Haiku 4.5	claude-haiku-4-5	claude-haiku-4-5-20251001	200K	Fast, cost-efficient, tool-compatible
Claude Opus 4.1	N/A	claude-opus-4-1-20250805	200K	High capability, still active
Claude Opus 4	N/A	claude-opus-4-20250514	200K	Still active in API
Claude Sonnet 4	N/A	claude-sonnet-4-20250514	200K	Still active, free-tier default
Claude 3 Haiku	N/A	claude-3-haiku-20240307	200K	Prior-gen Haiku, still callable

This lineup is accessible through the Anthropic API, with select models also available via AWS Bedrock and Google Vertex AI.

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Version Differences Affect Reasoning, Coding, Context Window, And Agent Features.

Claude 4.5 represents the latest model generation and introduces three specialized models, each tuned for a different balance of reasoning power, speed, and cost.

Opus 4.5 is the most capable model, excelling at complex reasoning, difficult problem solving, and agent-driven workflows. It introduces an “effort parameter,” allowing users to adjust response thoroughness versus efficiency for different scenarios.

Sonnet 4.5 offers the strongest coding and agent performance in the Claude lineup, supporting a 1 million token context window option in beta. It is the best choice for code-heavy tasks and large document workflows.

Haiku 4.5 builds on its predecessor by delivering even faster responses and maintaining robust tool compatibility, with an emphasis on cost efficiency for high-volume use.

Earlier Claude 4 and 3 models remain available for continuity and backward compatibility but are superseded by the 4.5 series for most demanding applications.

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Key Version Differences In Claude Models

Model	Distinguishing Features	Typical Use Cases
Opus 4.5	Maximum intelligence, effort parameter	Deep reasoning, complex agents, advanced research
Sonnet 4.5	Strongest for coding, 1M context (beta)	Software development, document analysis, large data
Haiku 4.5	Fastest, most efficient, enhanced tools	High-frequency use, quick analysis, cost-driven
Opus/Sonnet 4	Prior-gen, high context	Business chat, legacy app support
Haiku 3	Previous-gen, fast and lightweight	Quick tasks, legacy integrations

The version and model choice should reflect the complexity, volume, and speed requirements of your workload.

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Capabilities Comparison Highlights Tradeoffs In Reasoning, Speed, And Cost.

At the family level, Claude Opus models are designed for the highest reasoning depth and accuracy, Sonnet balances intelligence with speed and coding skills, and Haiku is optimized for low latency and high throughput.

All current Claude models support both text and image input, multilingual operation, and vision-related tasks, making modality less of a differentiator than performance, context window size, and agent compatibility.

Sonnet 4.5’s support for a 1 million token context window (in beta) sets it apart for large-scale document or multi-turn workflows.

Haiku 4.5’s speed and cost efficiency make it ideal for applications where real-time performance or operational scale are critical.

Opus 4.5’s “effort parameter” provides new controls for users who need to fine-tune the model’s output based on task demands.

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Claude Model Capability Comparison

Capability	Opus 4.5	Sonnet 4.5	Haiku 4.5
Deep reasoning	Best	Strong	Good
Coding/agents	Strong	Best	Moderate
Speed/efficiency	Moderate	Strong	Best
Context window	200K	200K (1M beta)	200K
Cost efficiency	Lowest	Moderate	Highest
Vision/multimodal	Yes	Yes	Yes

Selecting the right Claude model depends on workload complexity, need for context, and latency or budget sensitivity.

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Access Requirements Vary By Platform, Subscription Plan, And API Usage.

Access to Claude models depends on the surface and plan:

On the consumer side, free users typically access Sonnet 4 with usage caps, while paid Pro, Max, Team, and Enterprise plans unlock additional models (including Opus 4 and the latest 4.5 releases) and expand feature sets such as extended thinking and model selection.

Team and Enterprise plans grant access to all current Claude 3 and 4 model families, often with 200K token context windows and premium support.

API access requires a separate Anthropic Console account with usage billed by model, and model selection is managed by specifying either an alias or a versioned model ID.

Cloud marketplace users can access Claude models through AWS Bedrock and Google Vertex AI, using platform-specific model IDs, with availability varying by region and tier.

A Pro subscription for chat does not include API access, and vice versa; each access path is billed and managed separately.

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Claude AI Model Access By Platform

Platform	Models Available	Selection Method	Access Requirement
Consumer chat (Free)	Sonnet 4	Default	Free account, usage limits
Consumer chat (Pro/Max/Team/Enterprise)	Opus 4, Sonnet 4, all 4.5/4.x	Model selector	Paid subscription
Anthropic API	All active models	Alias or versioned ID	Console account, usage billing
AWS Bedrock, Google Vertex AI	All active models	Platform-specific ID	Cloud account, usage billing

Choosing the right platform and subscription unlocks the best Claude model for each use case.

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Claude AI Model Selection Enables Tailored Performance, Reasoning, And Cost Efficiency.

Claude’s evolving lineup gives users the ability to match model capabilities and costs to the needs of each project or workflow.

With clear distinctions between Opus, Sonnet, and Haiku for depth, speed, and cost, and with broad availability across chat, API, and cloud, Claude AI serves a wide range of tasks from code to content to large-scale analysis.

Users should review available models and platform options to ensure the best balance of performance, reasoning, and operational efficiency.

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