Claude Opus 5 (Reasoning)
by Anthropic
Claude Opus 5 (Reasoning) is a reasoning model from Anthropic, released on July 24, 2026. It has a 1M-token context window and can generate up to 128K output tokens. API pricing is $5 per 1M input tokens and $25 per 1M output tokens.
Claude Opus 5 is Anthropic's flagship general-access model, built for efficient agentic coding, knowledge work, scientific research, computer use, and problem-solving. Anthropic reports state-of-the-art results on Frontier-Bench v0.1 and GDPval-AA, substantial gains over Opus 4.8 across life-sciences evaluations, and support for configurable effort levels. It is available through the Claude API at the same $5/$25 per million input/output token price as Claude Opus 4.8.
Key specs
| Provider | Anthropic |
|---|---|
| Release date | 2026-07-24 |
| License | proprietary |
| Context window | 1M tokens |
| Max output | 128K tokens |
| Input price | $5 / 1M tokens |
| Output price | $25 / 1M tokens |
| Intelligence Score | 54 |
| Coding index | 39.8 |
Quick answers
What is the context window of Claude Opus 5 (Reasoning)?
Claude Opus 5 (Reasoning) has a context window of 1M tokens, with a maximum output of 128K tokens per response.
How much does Claude Opus 5 (Reasoning) cost?
Claude Opus 5 (Reasoning) costs $5 per 1M input tokens and $25 per 1M output tokens through the API.
Is Claude Opus 5 (Reasoning) open source?
No. Claude Opus 5 (Reasoning) is a proprietary model from Anthropic (proprietary license).
When was Claude Opus 5 (Reasoning) released?
Anthropic released Claude Opus 5 (Reasoning) on July 24, 2026.
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