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What is Claude Opus 5?
Claude Opus 5 is Anthropic's latest high-end Claude AI model, designed to deliver frontier performance. Released in July 2026, it was optimized for complex reasoning, coding, writing. Opus 5 performs nearly at the level — and sometimes even above — that of Fable 5.
Opus 5 highlights:
- Mythos-class performance: Opus 5 performs close to Fable 5, a flagship model, particularly on reasoning and coding tasks.
- Lower cost: Despite being almost as poweful as Fable 5, Opus 5 costs roughly 50% cheaper to use, making it more practical for everyday use.
- Optmized for agentic work: Opus 5 excels at planning, tool use, and long-running tasks, makeit it perfect as a fully fledged AI assistant.
Claude Opus 5 Features
Opus 5 features 1 million token context window and supports 128,000 tokens of output. In other words, it can keep up to 555,000 words in memory at the same time, and can output entire technical documentation documents in a single generation. Opus 5 also features a knowledge cutoff of May 2026 — the most recent of any current Claude model.
Claude Opus 5 Benchmarks
In the agentic terminal coding evaluation of Frontier-Bench v0.1, Anthropic's Claude Opus 5 achieved a score of 43.3%, which is more than double the score of 21.1% achieved by its predecessor, Opus 4.8. Notably, it maintained the same API pricing as its predecessor ($5/$25 per million input/output tokens), delivering a drastically lower cost per completed task. Furthermore, Opus 5 sets a new benchmark for AI alignment, emerging as Anthropic's most well-behaved model in recent automated safety audits. It achieved an impressively low score of 2.3 for overall misaligned behaviour, demonstrating an exceptional refusal response rate when exposed to adversarial prompts.
How to Access Claude Opus 5
If you're wondering how to access Claude Opus 5, it is primarily available through cloud services and APIs as it is a proprietary model. One of the easiest ways to access it is through the Overchat AI Pro subscription, which costs $14.99 per month.
