Claude Opus 4.1
Summary
Claude Opus 4.1 is a proprietary language model from Anthropic, released on 5 Aug 2025. It accepts text, images and PDFs and generates text, with a 200K-token context window and up to 32K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $15 per million input tokens and $75 per million output tokens (Azure AI Foundry), across 3 providers we track.
Flagship Claude model for deep reasoning, coding, and long-horizon agents
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Anthropic |
|---|---|
| Release date | 5 Aug 2025 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 200K (200,000 tokens) [models.dev] |
| Max output | 32K tokens [models.dev] |
| Knowledge cutoff | 31 Mar 2025 [models.dev] |
| Input | Text, images and PDFs [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
Claude Opus 4.1 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| Azure AI Foundry claude-opus-4-1 | $15 | $75 | $1.50 | 200K | models.dev, 4 Oct 2026 |
| Databricks databricks-claude-opus-4-1 | $15 | $75 | $1.50 | 200K | models.dev, 4 Oct 2026 |
| OpenRouter anthropic/claude-opus-4.1 | $15 | $75 | $1.50 | 200K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of Claude Opus 4.1?
Claude Opus 4.1 has a context window of 200,000 tokens (200K) and can generate up to 32,000 tokens in a single response, according to models.dev.
How much does the Claude Opus 4.1 API cost?
Claude Opus 4.1 is listed from $15 per million input tokens and $75 per million output tokens (Azure AI Foundry). Prices last verified 4 Oct 2026.
Is Claude Opus 4.1 open source?
No. Claude Opus 4.1 is a proprietary model; Anthropic has not released its weights. It is available through APIs including Azure AI Foundry, Databricks, OpenRouter.
When was Claude Opus 4.1 released?
Anthropic released Claude Opus 4.1 on 5 Aug 2025, according to models.dev.
Which providers offer Claude Opus 4.1?
We track Claude Opus 4.1 on 3 providers: Azure AI Foundry, Databricks, OpenRouter.
Change history
No changes detected since we started tracking this model. We re-check every source daily.