Advanced Coding
Handles complex software engineering tasks including multi-file refactoring and bug fixing, scoring 74.5% on SWE-bench Verified.
Anthropic
Claude 4.1 Opus
Claude Opus 4.1 is Anthropic's flagship text generation model, released on August 5, 2025 as an upgrade to Claude Opus 4. It is designed for demanding workflows that require sustained reasoning across long, multi-step tasks, with particular strength in software development, autonomous research, and agentic problem solving. The model supports a 200,000-token context window, up to 32,000 output tokens, and accepts both text and image inputs. It is multilingual, with documented support for French, Arabic, Mandarin, Japanese, Korean, Spanish, and Hindi. On the SWE-bench Verified benchmark for real-world software bug fixing, Claude Opus 4.1 scores 74.5%, and it delivers a one standard deviation improvement over Opus 4 on Windsurf's junior developer benchmark for autonomous coding tasks. It supports extended thinking with up to 64,000 reasoning tokens, enabling deeper deliberation on complex problems. The model is available through the Anthropic API, Claude Code, Amazon Bedrock, and Google Cloud Vertex AI, making it suited for developers, researchers, and enterprises running complex multi-file code refactoring, long-horizon agent workflows, and in-depth research synthesis.
Aug 05, 2025
32,000 context
32,000 tokens output
Advanced Coding
Extended Thinking
Agentic Task Execution
Large Context Window
Vision Input
Multilingual Support
Model Overview
High-signal model metadata in a structured two-column overview table.
Provider
The entity that provides this model.
Anthropic
Model ID
The routed model identifier exposed by upstream providers.
anthropic/claude-opus-4.1
Input Context Window
The number of tokens supported by the input context window.
32,000
tokens
Maximum Output Tokens
The number of tokens that can be generated by the model in a single request.
32,000 tokens
tokens
Open Source
Whether the model's code is available for public use.
No
Release Date
When the model was first released.
Aug 05, 2025
1 year ago
Knowledge Cut-off Date
When the model's knowledge was last updated.
August 2025
API Providers
The providers that offer this model. This is not an exhaustive list.
Vertex AI, Amazon Bedrock, Google
Modalities
Types of data this model can process.
Text
Image
Code
File
What is Claude 4.1 Opus
A fuller summary of positioning, capabilities, and source-specific details for Claude 4.1 Opus.
Claude Opus 4.1 is Anthropic's flagship text generation model, released on August 5, 2025 as an upgrade to Claude Opus 4. It is designed for demanding workflows that require sustained reasoning across long, multi-step tasks, with particular strength in software development, autonomous research, and agentic problem solving. The model supports a 200,000-token context window, up to 32,000 output tokens, and accepts both text and image inputs. It is multilingual, with documented support for French, Arabic, Mandarin, Japanese, Korean, Spanish, and Hindi.
On the SWE-bench Verified benchmark for real-world software bug fixing, Claude Opus 4.1 scores 74.5%, and it delivers a one standard deviation improvement over Opus 4 on Windsurf's junior developer benchmark for autonomous coding tasks. It supports extended thinking with up to 64,000 reasoning tokens, enabling deeper deliberation on complex problems. The model is available through the Anthropic API, Claude Code, Amazon Bedrock, and Google Cloud Vertex AI, making it suited for developers, researchers, and enterprises running complex multi-file code refactoring, long-horizon agent workflows, and in-depth research synthesis.
Capabilities
What Claude 4.1 Opus supports
Extended Thinking
Supports up to 64,000 tokens of extended reasoning, allowing the model to deliberate more deeply on complex, multi-step problems.
Agentic Task Execution
Runs long-horizon autonomous workflows with fewer errors, achieving a one standard deviation improvement over Opus 4 on Windsurf's junior developer benchmark.
Large Context Window
Processes up to 200,000 tokens of input context, enabling analysis of large codebases, lengthy documents, or extended conversation histories in a single pass.
Vision Input
Accepts image inputs alongside text, allowing the model to analyze diagrams, screenshots, and other visual content within a prompt.
Multilingual Support
Handles multiple languages including French, Arabic, Mandarin, Japanese, Korean, Spanish, and Hindi.
Deep Research Synthesis
Performs agentic search and detail tracking across sources such as patent databases, academic papers, and market reports to synthesize insights independently.
High Output Length
Generates responses of up to 32,000 output tokens, supporting long-form documents, detailed code files, and extended analytical reports.
Pricing for Claude 4.1 Opus
Primary API pricing shown in the same “quick compare” spirit as the reference page.
Input tokens
$15.00
Per million tokens
Output tokens
$75.00
Per million tokens
Price Comparison
Additional usage-cost dimensions synced into the project for this model.
Web search
$10000.00
Cache read
$1.50
Cache write
$18.75
maxTemperature
1
maxResponseSize
32,000 tokens
API Access & Providers
Places where this model is available, based on the synced detail-page metadata.
Vertex AI
Amazon Bedrock
Google
Provider Endpoints
Endpoint-level provider data currently available for this model.
Amazon Bedrock
Resources & Documentation
Official model cards, release notes, docs, and other references synced from the source page.
Announcement Blog Post
Announcements
→
Model Overview Page
Other
→
System Card
Research
→
API Model Reference
Documentation
→
API Pricing Page
Other
→
Anthropic API Documentation
Documentation
→
Claude on Amazon Bedrock
Other
→
Claude on Google Cloud Vertex AI
Other
→
About Claude
→
Anthropic Prompt Engineering Resources
→
Official Website
→
Acceptable Use Policy
→
Anthropic Trust Center
→
OpenRouter Model Page
OpenRouter
→
Related Daily Briefs
Recent daily stories tied to Claude 4.1 Opus through direct model mentions or provider-level coverage.
Anthropic and OpenAI move deeper into real workflows.
2026-09-12
AI Models
Policy
Anthropic and OpenAI move deeper into real workflows.
2026-09-11
AI Models
AI API
OpenAI and Anthropic move deeper into real workflows.
2026-09-10
AI Models
AI API
OpenAI and Hugging Face move deeper into real workflows.
2026-09-02
AI Models
Security
Community discussion
What people think about Claude 4.1 Opus
Claude 4.1 Opus discussions are most active in r/singularity. Top Reddit threads cluster around benchmark and model-comparison threads. The strongest match in this snapshot has 340 upvotes and 80 comments.
"GDPval, the first version of this evaluation, spans 44 occupations selected from the top 9 industries contributing to U.S. GDP. The GDPval full set includes 1,320 specialized tasks (220 in the gold open-sourced set), each meticulously crafted and vetted by experienced professionals with over 14 years of experience on average from these fields. Every task is based on real work products, such as a legal brief, an engineering blueprint, a customer support conversation, or a nursing care plan."
The benchmark measures win rates against the output of human professionals (with the little blue lines representing ties). In other words, when this benchmark gets maxed out, we may be in the end-game for our current economic system.
Which brings up into the third place.
FAQ
Common questions about Claude 4.1 Opus
What is the context window size for Claude Opus 4.1?
Claude Opus 4.1 supports a 200,000-token context window, with a maximum output of 32,000 tokens per response.
What is the model ID to use Claude Opus 4.1 via the API?
The model ID is claude-opus-4-1-20250805. You can find the full list of available model identifiers in Anthropic's API Model Reference documentation.
Where can I find pricing for Claude Opus 4.1?
API pricing for Claude Opus 4.1 is listed on Anthropic's pricing page at anthropic.com/pricing#api.
What is the training data cutoff for Claude Opus 4.1?
The model's training date is listed as August 2025. For precise knowledge cutoff details, refer to the System Card or API documentation provided by Anthropic.
What platforms support Claude Opus 4.1?
Claude Opus 4.1 is available through the Anthropic API, Claude Code, Amazon Bedrock, and Google Cloud Vertex AI.
Does Claude Opus 4.1 support extended thinking?
Yes. Claude Opus 4.1 supports extended thinking with up to 64,000 reasoning tokens, which allows the model to work through complex problems with deeper deliberation before producing a response.
More models from Anthropic
Continue browsing adjacent models from the same provider.