# Claude Opus 4.1

> Anthropic's August 2025 Opus flagship — a coding-focused upgrade to Claude Opus 4.

- Maker: Anthropic
- Line: Claude Opus
- Canonical page: https://ai-tldr.dev/models/claude-opus-4-1/
- Updated: 2026-08-20

## In short

Claude Opus 4.1 is an Opus-tier large language model that Anthropic released on August 5, 2025, as an incremental upgrade to Claude Opus 4. It targets agentic tasks, real-world coding, and reasoning, and on launch it set a new high for the family on SWE-bench Verified at 74.5%, up from 72.5% for Claude Opus 4.

## Facts

| Fact | Value | Source |
| --- | --- | --- |
| Context window | 200K (max output 32K) | [1] |
| Input price | $15 / 1M tokens (cached $1.50 / 1M tokens (cache read); cache writes $18.75 (5m) / $30 (1h) per 1M) | [2] |
| Output price | $75 / 1M tokens | [2] |
| Licence | Proprietary · API only | [1] |
| Released | 5 August 2025 | [3] |
| Knowledge cutoff | Reliable knowledge cutoff January 2025 (training data through March 2025) | [1] |

## Sources

1. [Claude Opus 4.1 System Card Addendum](https://www.anthropic.com/claude-opus-4-1-system-card)
2. [Claude API pricing](https://platform.claude.com/docs/en/about-claude/pricing)
3. [Claude Opus 4.1 announcement](https://www.anthropic.com/news/claude-opus-4-1)

## Overview

Claude Opus 4.1 is an Opus-tier large language model that Anthropic released on August 5, 2025, as an incremental upgrade to Claude Opus 4. It targets agentic tasks, real-world coding, and reasoning, and on launch it set a new high for the family on SWE-bench Verified at 74.5%, up from 72.5% for Claude Opus 4. Anthropic shipped it at the same price as its predecessor and made it available on the Claude API as claude-opus-4-1-20250805 (alias claude-opus-4-1), as well as on Amazon Bedrock and Google Cloud Vertex AI.

Functionally, Claude Opus 4.1 carries a 200K-token context window, generates up to 32K output tokens, and accepts both text and images (vision). It supports extended thinking, where the model can reason for longer on a request using a thinking budget of up to 64K tokens. Its knowledge is most reliable through January 2025, with training data extending to March 2025. The model focuses its gains on multi-file code refactoring and detail tracking for in-depth research and data analysis rather than on a broad capability jump.

Claude Opus 4.1 is now a legacy model. Anthropic deprecated it and scheduled retirement for August 5, 2026, and recommends migrating to a current Opus model such as Claude Opus 4.8. New projects should generally not start on Opus 4.1; this page documents its verified specifications for teams still running it or evaluating which version they depend on.

## Benchmarks

- SWE-bench Verified: 74.5% ([source](https://www.anthropic.com/news/claude-opus-4-1))

## Pricing

- Input: $15 / 1M tokens per 1M tokens
- Cached input: $1.50 / 1M tokens (cache read); cache writes $18.75 (5m) / $30 (1h) per 1M per 1M tokens
- Output: $75 / 1M tokens per 1M tokens

Batch API is 50% off: $7.50 input / $37.50 output per 1M tokens. Pricing is unchanged from Claude Opus 4.

Source: https://platform.claude.com/docs/en/about-claude/pricing

## Strengths

- State-of-the-art real-world coding for its generation at launch — 74.5% on SWE-bench Verified
- Strong agentic and multi-step task execution, including multi-file code refactoring
- Improved detail tracking and agentic search for in-depth research and data analysis
- Optional extended thinking with a budget of up to 64K tokens for harder reasoning problems
- Multimodal: handles both text and image (vision) input
- Available across the Claude API, Amazon Bedrock, and Google Cloud Vertex AI

## Best for

- Agentic coding and autonomous multi-step software engineering tasks
- Large multi-file code refactoring and bug fixing
- In-depth research and data analysis that requires careful detail tracking
- Document and image understanding via vision input
- Reasoning-heavy tasks that benefit from extended thinking

## How to access

- [Anthropic (Claude API)](https://platform.claude.com/docs/en/about-claude/models/overview) — model id `claude-opus-4-1-20250805`
- [Amazon Bedrock](https://platform.claude.com/docs/en/about-claude/models/overview) — model id `anthropic.claude-opus-4-1-20250805-v1:0`
- [Google Cloud Vertex AI](https://platform.claude.com/docs/en/about-claude/models/overview) — model id `claude-opus-4-1@20250805`

## Claude Opus versions

- [Claude Opus 4.8](https://ai-tldr.dev/models/claude-opus-4-8/) (28 May 2026)
- [Claude Opus 4.7](https://ai-tldr.dev/models/claude-opus-4-7/) (16 April 2026)
- [Claude Opus 4.6](https://ai-tldr.dev/models/claude-opus-4-6/) (5 February 2026)
- [Claude Opus 4.5](https://ai-tldr.dev/models/claude-opus-4-5/) (24 November 2025)
- Claude Opus 4.1 (5 August 2025) — this page
- [Claude Opus 4](https://ai-tldr.dev/models/claude-opus-4/) (22 May 2025)
- [Claude 3 Opus](https://ai-tldr.dev/models/claude-3-opus/) (4 March 2024)

## FAQ

### What is Claude Opus 4.1?

Claude Opus 4.1 is an Opus-tier large language model from Anthropic, released on August 5, 2025, as an incremental upgrade to Claude Opus 4 focused on agentic tasks, real-world coding, and reasoning. Its API model ID is claude-opus-4-1-20250805.

### How good is Claude Opus 4.1 at coding?

At launch it set a new state of the art for its generation on SWE-bench Verified with a score of 74.5%, compared with 72.5% for Claude Opus 4. Anthropic also highlighted gains in multi-file code refactoring and agentic coding tasks.

### What are the context window and pricing for Claude Opus 4.1?

Claude Opus 4.1 has a 200K-token context window and produces up to 32K output tokens. It is priced at $15 per million input tokens and $75 per million output tokens, the same as Claude Opus 4. The Batch API offers a 50% discount.

### Is Claude Opus 4.1 still available?

Claude Opus 4.1 is deprecated and scheduled to retire on August 5, 2026. Anthropic recommends migrating to a current Opus model, such as Claude Opus 4.8, before the retirement date.

## Links

- [Claude Opus 4.1 announcement](https://www.anthropic.com/news/claude-opus-4-1)
- [Claude Opus 4.1 System Card Addendum](https://www.anthropic.com/claude-opus-4-1-system-card)
- [Claude models overview (specs)](https://platform.claude.com/docs/en/about-claude/models/overview)
- [Claude API pricing](https://platform.claude.com/docs/en/about-claude/pricing)
- [Anthropic model deprecations (retirement dates)](https://platform.claude.com/docs/en/about-claude/model-deprecations)

Source: AI/TLDR LLM registry, https://ai-tldr.dev/models/claude-opus-4-1/