Claude Opus 5 Release: Specs and Availability
Anthropic released Claude Opus 5 on July 24, 2026. This article details its 1M token context window, pricing, and platform availability for engineering…
Official Announcement and Specifications
Anthropic officially launched Claude Opus 5 (claude-opus-5) on July 24, 2026. The source material describes this release as a step-change improvement over Claude Opus 4.8. The model supports a 1M token context window, which applies to both the default and maximum settings. Additionally, it allows for 128k max output tokens. Thinking is enabled by default in this version.
- Context Window: 1,000,000 tokens (default and maximum)
- Max Output Tokens: 128,000
- Thinking Mode: On by default
- Input Modalities: Text and Image
- Output Modality: Text
Pricing and Platform Availability
The pricing for Claude Opus 5 is set at $5 per million input tokens and $25 per million output tokens. This matches the pricing structure of Claude Opus 4.8. The model is accessible through several platforms, including the Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry. The source notes that open weights are not confirmed for this release. Engineers should note that while the model is available across these cloud services, specific deployment architectures or local installation requirements are not detailed in the provided facts.
Evaluation Procedure for Engineers
To evaluate Claude Opus 5, engineers should design tests based on their specific use cases. First, test the model with inputs approaching the 1M token limit to measure latency and consistency. Second, validate the behavior of the default thinking mode by comparing outputs against previous versions if applicable. Third, compare cost efficiency by measuring token usage against the $5/$25 rate. Finally, verify integration stability across the listed cloud providers. These steps allow teams to assess performance without assuming unverified benefits.
- Test long-context handling with near-limit inputs
- Measure response time for 128k output generations
- Compare output quality against baseline models
- Validate API integration on target cloud platforms
Artificial Analysis benchmark review
Benchmark review updated on . These scores apply to the linked artifact and recorded methodology; they do not establish the performance of a different runtime or quantized model.
| Measurement | Recorded result | Measured |
|---|---|---|
| Artificial Analysis Coding Index (v4.1) ↗ | 78 index_points | 2026-08-09 |
| Artificial Analysis Coding Index (v4.2) ↗ | 78 index_points | 2026-09-05 |
| Artificial Analysis Coding Index (v4.3) ↗ | 78 index_points | 2026-09-20 |
| Artificial Analysis Intelligence Index (v4.1) ↗ | 63.1 index_points | 2026-08-09 |
| Artificial Analysis Intelligence Index (v4.2) ↗ | 54.1 index_points | 2026-09-05 |
| Artificial Analysis Intelligence Index (v4.3) ↗ | 50.8 index_points | 2026-09-20 |
Review the full benchmark provenance and source methodology →
Primary sources
Frequently asked questions
What is the exact date of the Claude Opus 5 announcement?
The official announcement date recorded in the source is July 24, 2026. This historical date distinguishes the release event from the current publication date of this article.
Does the source confirm local installation capabilities?
No. The source states that open weights are not confirmed. It does not establish whether local installation is possible or impossible, nor does it specify mandatory API access or hosting arrangements beyond the listed cloud platforms.