# Claude Opus 4

> Anthropic's May 2025 flagship — the model it called the world's best for coding and long-horizon agents.

- Maker: Anthropic
- Line: Claude Opus
- Canonical page: https://ai-tldr.dev/models/claude-opus-4/
- Updated: 2026-06-18

## In short

Claude Opus 4 is a large language model from Anthropic, the flagship of the Claude 4 generation released on May 22, 2025. It has a 200K-token context window and costs $15.00 per million input tokens and $75.00 per million output tokens. You can use it through Anthropic.

## Facts

| Fact | Value | Source |
| --- | --- | --- |
| Context window | 200K (max output 32K) | [1] |
| Input price | $15.00 per million tokens | [2] |
| Output price | $75.00 per million tokens | [2] |
| Licence | Proprietary · API only | [1] |
| Released | 22 May 2025 | [1] |

## Sources

1. [Claude Opus 4 & Sonnet 4 System Card](https://www.anthropic.com/claude-4-system-card)
2. [Anthropic — Introducing Claude 4 (announcement)](https://www.anthropic.com/news/claude-4)

## Overview

Claude Opus 4 is a large language model from Anthropic, the flagship of the Claude 4 generation released on May 22, 2025. At launch Anthropic positioned Claude Opus 4 as its most capable model and described it as the world's best coding model, built for complex, long-running tasks that can require thousands of steps and several hours of continuous work.

Claude Opus 4 accepts text and image input and returns text, with a 200K-token context window and up to 32K output tokens. It is a hybrid reasoning model that offers both near-instant responses and an extended-thinking mode for deeper, step-by-step reasoning. Pricing at launch was $15 per million input tokens and $75 per million output tokens.

Claude Opus 4 was superseded by Claude Opus 4.1 (August 2025) and later Opus 4.x releases, and the original snapshot (claude-opus-4-20250514) has since been retired. It remains a notable milestone as the model that launched Anthropic's Claude 4 line and its leading position on agentic coding benchmarks.

## Benchmarks

- SWE-bench Verified: 72.5% ([source](https://www.anthropic.com/news/claude-4))
- Terminal-bench: 43.2% ([source](https://www.anthropic.com/news/claude-4))
- GPQA Diamond: 74.9% ([source](https://www.anthropic.com/news/claude-4))
- MMLU: 87.4% ([source](https://www.anthropic.com/news/claude-4))
- MMMU: 73.7% ([source](https://www.anthropic.com/news/claude-4))
- AIME 2025: 33.9% ([source](https://www.anthropic.com/news/claude-4))

## Pricing

- Input: $15.00 per million tokens
- Output: $75.00 per million tokens

Source: https://www.anthropic.com/news/claude-4

## Strengths

- Agentic coding — 72.5% on SWE-bench Verified at launch, which Anthropic cited as best-in-class
- Sustained long-horizon work — designed to run continuously for hours across thousands of steps
- Hybrid reasoning with an extended-thinking mode for harder, multi-step problems
- Strong graduate-level reasoning and knowledge (74.9% GPQA Diamond, 87.4% MMLU)
- Multimodal text + image understanding (73.7% MMMU)

## Best for

- Autonomous and agentic coding workflows
- Large-codebase refactors and multi-file software tasks
- Long-running agents that execute many sequential steps
- Complex reasoning and technical research
- Document and image analysis

## How to access

- [Anthropic](https://www.anthropic.com/claude/opus) — model id `claude-opus-4-20250514`

## 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](https://ai-tldr.dev/models/claude-opus-4-1/) (5 August 2025)
- Claude Opus 4 (22 May 2025) — this page
- [Claude 3 Opus](https://ai-tldr.dev/models/claude-3-opus/) (4 March 2024)

## FAQ

### When was Claude Opus 4 released?

Anthropic released Claude Opus 4 on May 22, 2025, as the flagship model of the Claude 4 generation alongside Claude Sonnet 4.

### What is Claude Opus 4's context window and max output?

Claude Opus 4 has a 200K-token context window and can generate up to 32K output tokens per response. It accepts both text and image input.

### How much did Claude Opus 4 cost?

Claude Opus 4 was priced at $15 per million input tokens and $75 per million output tokens via the Anthropic API.

### Is Claude Opus 4 still available?

No. The original snapshot (claude-opus-4-20250514) has been retired. It was succeeded by Claude Opus 4.1 in August 2025 and later Opus 4.x models; Anthropic recommends migrating to the current Claude Opus tier.

## Links

- [Anthropic — Introducing Claude 4 (announcement)](https://www.anthropic.com/news/claude-4)
- [Claude Opus 4 & Sonnet 4 System Card](https://www.anthropic.com/claude-4-system-card)
- [Claude API — Models overview](https://platform.claude.com/docs/en/about-claude/models/overview)
- [Claude Opus 4 — specs & benchmarks (LLM-Stats)](https://llm-stats.com/models/claude-opus-4-20250514)

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