The next generation of Claude Models:
Claude Sonnet 4.5 - Our best model for complex agents and coding, with the highest intelligence across most tasks. Learn more.
Claude Opus 4.1 - Exceptional model for specialized complex tasks requiring advanced reasoning. Learn more.
Claude Sonnet 4.5 - Our best model for complex agents and coding, with the highest intelligence across most tasks. Learn more.
Claude Opus 4.1 - Exceptional model for specialized complex tasks requiring advanced reasoning. Learn more.
Claude Sonnet 4.5
Our best model for complex agents and coding
- Text and image input
- Text output
- 200k context window (1M context beta available)
- Highest intelligence across most tasks
Claude Opus 4.1
Exceptional model for specialized complex tasks
- Text and image input
- Text output
- 200k context window
- Superior reasoning capabilities
Model names
| Model | Claude 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 4.5 | claude-sonnet-4-5-20250929 | anthropic.claude-sonnet-4-5-20250929-v1:0 | claude-sonnet-4-5@20250929 |
| 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.
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-4-5-20250929) 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 4.5 | claude-sonnet-4-5 | claude-sonnet-4-5-20250929 |
| 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 Sonnet 4.5 | Claude Sonnet 4 | Claude Sonnet 3.7 | Claude Opus 4.1 | Claude Opus 4 | Claude Haiku 3.5 | Claude Haiku 3 |
|---|---|---|---|---|---|---|---|
| Description | Our best model for complex agents and coding | High-performance model | High-performance model with early extended thinking | Exceptional model for specialized complex tasks | Our previous flagship model | Our fastest model | Fast and compact model for near-instant responsiveness |
| Strengths | Highest intelligence across most tasks with exceptional agent and coding capabilities | High intelligence and balanced performance | High intelligence with toggleable extended thinking | Very high intelligence and capability for specialized tasks | Very high intelligence and capability | Intelligence at blazing speeds | Quick and accurate targeted performance |
| Multilingual | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Vision | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Extended thinking | Yes | Yes | Yes | Yes | Yes | No | No |
| Priority Tier | Yes | Yes | Yes | Yes | Yes | Yes | No |
| API model name | claude-sonnet-4-5-20250929 | claude-sonnet-4-20250514 | claude-3-7-sonnet-20250219 | claude-opus-4-1-20250805 | claude-opus-4-20250514 | claude-3-5-haiku-20241022 | claude-3-haiku-20240307 |
| Comparative latency | Fast | Fast | Fast | Moderately Fast | Moderately Fast | Fastest | Fast |
| Context window | / 1M (beta)1 | / 1M (beta)1 | |||||
| Max output | |||||||
| Reliable knowledge cutoff | Jan 20252 | Jan 20252 | Oct 20242 | Jan 20252 | Jan 20252 | 3 | 3 |
| Training data cutoff | Jul 2025 | Mar 2025 | Nov 2024 | Mar 2025 | Mar 2025 | Jul 2024 | Aug 2023 |
context-1m-2025-08-07 beta header. Long context pricing applies to requests exceeding 200K tokens.
2 - Reliable knowledge cutoff indicates the date through which a model’s knowledge is most extensive and reliable. Training data cutoff is the broader date range of training data used. For example, Claude Sonnet 4.5 was trained on publicly available information through July 2025, but its knowledge is most extensive and reliable through January 2025. For more information, see Anthropic’s Transparency Hub.
3 - Haiku models have a single training data cutoff date.
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 4.5 | $3 / MTok | $3.75 / MTok | $6 / MTok | $0.30 / MTok | $15 / 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:-
Update your model name:
- From: claude-3-7-sonnet-20250219
- To: claude-sonnet-4-5-20250929 or claude-opus-4-1-20250805
- 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).
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.
Claude Console
Craft and test powerful prompts directly in your browser.