Models overview

Claude is a family of state-of-the-art large language models developed by Anthropic. This guide introduces our models and compares their performance with legacy models.

The next generation of Claude Models:

Claude Opus 4.1 - Our most capable and intelligent model yet. Claude Opus 4.1 sets new standards in complex reasoning and advanced coding. Learn more.

Claude Sonnet 4 - Our high-performance model with exceptional reasoning and efficiency. Learn more.

Claude Opus 4.1

Our most powerful and capable model

• Text and image input
• Text output
• 200k context window
• Superior reasoning capabilities

Claude Sonnet 4

High-performance model with exceptional reasoning capabilities

• Text and image input
• Text output
• 200k context window (1M context beta available)

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Model names

Model	Anthropic API	AWS Bedrock	GCP Vertex AI
Claude Opus 4.1	claude-opus-4-1-20250805	anthropic.claude-opus-4-1-20250805-v1:0	claude-opus-4-1@20250805
Claude Opus 4	claude-opus-4-20250514	anthropic.claude-opus-4-20250514-v1:0	claude-opus-4@20250514
Claude Sonnet 4	claude-sonnet-4-20250514	anthropic.claude-sonnet-4-20250514-v1:0	claude-sonnet-4@20250514
Claude Sonnet 3.7	claude-3-7-sonnet-20250219 (claude-3-7-sonnet-latest)	anthropic.claude-3-7-sonnet-20250219-v1:0	claude-3-7-sonnet@20250219
Claude Haiku 3.5	claude-3-5-haiku-20241022 (claude-3-5-haiku-latest)	anthropic.claude-3-5-haiku-20241022-v1:0	claude-3-5-haiku@20241022
Claude Haiku 3	claude-3-haiku-20240307	anthropic.claude-3-haiku-20240307-v1:0	claude-3-haiku@20240307

Models with the same snapshot date (e.g., 20240620) are identical across all platforms and do not change. The snapshot date in the model name ensures consistency and allows developers to rely on stable performance across different environments.

The API remains the same for Opus 4 and Opus 4.1 models, but updated API form validation in Opus 4.1 does not allow both temperature and top_p parameters to be specified. Please use only one.

Model aliases

For convenience during development and testing, we offer aliases for our model ids. These aliases automatically point to the most recent snapshot of a given model. When we release new model snapshots, we migrate aliases to point to the newest version of a model, typically within a week of the new release.

While aliases are useful for experimentation, we recommend using specific model versions (e.g., claude-sonnet-4-20250514) in production applications to ensure consistent behavior.

Model	Alias	Model ID
Claude Opus 4.1	claude-opus-4-1	claude-opus-4-1-20250805
Claude Opus 4	claude-opus-4-0	claude-opus-4-20250514
Claude Sonnet 4	claude-sonnet-4-0	claude-sonnet-4-20250514
Claude Sonnet 3.7	claude-3-7-sonnet-latest	claude-3-7-sonnet-20250219
Claude Haiku 3.5	claude-3-5-haiku-latest	claude-3-5-haiku-20241022

Aliases are subject to the same rate limits and pricing as the underlying model version they reference.

Model comparison table

To help you choose the right model for your needs, we’ve compiled a table comparing the key features and capabilities of each model in the Claude family:

Feature	Claude Opus 4.1	Claude Opus 4	Claude Sonnet 4	Claude Sonnet 3.7	Claude Haiku 3.5	Claude Haiku 3
Description	Our most capable model	Our previous flagship model	High-performance model	High-performance model with early extended thinking	Our fastest model	Fast and compact model for near-instant responsiveness
Strengths	Highest level of intelligence and capability	Very high intelligence and capability	High intelligence and balanced performance	High intelligence with toggleable extended thinking	Intelligence at blazing speeds	Quick and accurate targeted performance
Multilingual	Yes	Yes	Yes	Yes	Yes	Yes
Vision	Yes	Yes	Yes	Yes	Yes	Yes
Extended thinking	Yes	Yes	Yes	Yes	No	No
Priority Tier	Yes	Yes	Yes	Yes	Yes	No
API model name	claude-opus-4-1-20250805	claude-opus-4-20250514	claude-sonnet-4-20250514	claude-3-7-sonnet-20250219	claude-3-5-haiku-20241022	claude-3-haiku-20240307
Comparative latency	Moderately Fast	Moderately Fast	Fast	Fast	Fastest	Fast
Context window	200K	200K	200K / 1M (beta)2	200K	200K	200K
Max output	32000 tokens	32000 tokens	64000 tokens	64000 tokens	8192 tokens	4096 tokens
Training data cut-off	Mar 2025	Mar 2025	Mar 2025	Nov 20241	July 2024	Aug 2023

^{1 - While trained on publicly available information on the internet through November 2024, Claude Sonnet 3.7’s knowledge cut-off date is the end of October 2024. This means the models’ knowledge base is most extensive and reliable on information and events up to October 2024.}

^{2 - Claude Sonnet 4 supports a 1M token context window when using the context-1m-2025-08-07 beta header. Long context pricing applies to requests exceeding 200K tokens.}

Include the beta header output-128k-2025-02-19 in your API request to increase the maximum output token length to 128k tokens for Claude Sonnet 3.7.

We strongly suggest using our streaming Messages API to avoid timeouts when generating longer outputs. See our guidance on long requests for more details.

Model pricing

The table below shows the price per million tokens for each model:

Model	Base Input Tokens	5m Cache Writes	1h Cache Writes	Cache Hits & Refreshes	Output Tokens
Claude Opus 4.1	$15 / MTok	$18.75 / MTok	$30 / MTok	$1.50 / MTok	$75 / MTok
Claude Opus 4	$15 / MTok	$18.75 / MTok	$30 / MTok	$1.50 / MTok	$75 / MTok
Claude Sonnet 4	$3 / MTok	$3.75 / MTok	$6 / MTok	$0.30 / MTok	$15 / MTok
Claude Sonnet 3.7	$3 / MTok	$3.75 / MTok	$6 / MTok	$0.30 / MTok	$15 / MTok
Claude Sonnet 3.5 (deprecated)	$3 / MTok	$3.75 / MTok	$6 / MTok	$0.30 / MTok	$15 / MTok
Claude Haiku 3.5	$0.80 / MTok	$1 / MTok	$1.6 / MTok	$0.08 / MTok	$4 / MTok
Claude Opus 3 (deprecated)	$15 / MTok	$18.75 / MTok	$30 / MTok	$1.50 / MTok	$75 / MTok
Claude Haiku 3	$0.25 / MTok	$0.30 / MTok	$0.50 / MTok	$0.03 / MTok	$1.25 / MTok

Prompt and output performance

Claude 4 models excel in:

• Performance: Top-tier results in reasoning, coding, multilingual tasks, long-context handling, honesty, and image processing. See the Claude 4 blog post for more information.

• Engaging responses: Claude models are ideal for applications that require rich, human-like interactions.

  • If you prefer more concise responses, you can adjust your prompts to guide the model toward the desired output length. Refer to our prompt engineering guides for details.
  • For specific Claude 4 prompting best practices, see our Claude 4 best practices guide.

• Output quality: When migrating from previous model generations to Claude 4, you may notice larger improvements in overall performance.

Migrating to Claude 4

In most cases, you can switch from Claude 3.7 models to Claude 4 models with minimal changes:

1. Update your model name:

   • From: claude-3-7-sonnet-20250219
   • To: claude-sonnet-4-20250514 or claude-opus-4-1-20250805

2. Your existing API calls will continue to work without modification, although API behavior has changed slightly in Claude 4 models (see API release notes for details).

For more details, see Migrating to Claude 4.

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Get started with Claude

If you’re ready to start exploring what Claude can do for you, let’s dive in! Whether you’re a developer looking to integrate Claude into your applications or a user wanting to experience the power of AI firsthand, we’ve got you covered.

Looking to chat with Claude? Visit claude.ai!

Intro to Claude

Explore Claude’s capabilities and development flow.

Quickstart

Learn how to make your first API call in minutes.

Anthropic Console

Craft and test powerful prompts directly in your browser.

If you have any questions or need assistance, don’t hesitate to reach out to our support team or consult the Discord community.