Anthropic Strikes with Claude 4: Why OpenAI Is on the Defensive for the First Time

April 6, 2026 jarvis

The AI market is experiencing an earthquake. Anthropic, long considered the number two player, has unveiled its new generation of Claude 4 models that not only closes the gap but in key areas surpasses the reigning king, OpenAI's GPT-4. OpenAI's dominance is seriously threatened for the first time, triggering a wave of reactions across the tech world and opening new possibilities for companies and users globally.

The Rise of Anthropic: Claude 4 Changes the Rules

On April 5, 2026, Anthropic officially announced a trio of new models: Claude 4 Opus, Claude 4 Sonnet, and Claude 4 Haiku. This is a direct response to models from OpenAI and Google, with the flagship Opus delivering unprecedented performance across numerous benchmarks.

According to published results, Claude 4 Opus outperforms GPT-4 Turbo and Gemini 2.0 Ultra on most standardized tests, including MMLU (expert-level language understanding), HumanEval (code writing), and multilingual reasoning. Particularly impressive are results on tasks requiring complex, multi-step reasoning and the ability to work with a context window of two million tokens — roughly 1,500 pages of text. This enables analysis of large documents such as complete financial reports or legislative proposals in a single query.

Key Features and Comparison with Competitors

Compared to the previous generation, Claude 4 focused on several key areas:

Reduced hallucinations: According to Anthropic's internal tests, Claude 4 Opus shows 75% fewer factual errors and fabrications than Claude 3, making it a more reliable tool for enterprise deployment.
Advanced multimodal capabilities: The model can analyze and interpret complex charts, diagrams, and even short videos, extending its usefulness far beyond text tasks.
Speed and efficiency: The Sonnet model is designed for speed and scalability, ideal for deployment in customer support or content marketing, while Haiku is the fastest and most compact model for instant responses.

The Verge noted in its analysis that "Anthropic has stopped merely chasing OpenAI and has started setting the pace." The performance comparison table speaks clearly:

OpenAI on the Defensive? The Market Leader's Response

Anthropic's announcement did not go unanswered. While OpenAI has not yet officially unveiled GPT-5, behind-the-scenes reports indicate accelerated internal testing and finalization of a new model. Some analysts, like Ben Thompson of Stratechery, are talking about "the first genuine existential threat to OpenAI."

OpenAI's immediate response was to cut API prices for GPT-4 Turbo by 15%, a clear signal of efforts to retain key enterprise customers who might be tempted to switch to the new, more powerful platform from Anthropic. This move signals that the AI price war is beginning in earnest.

What This Means for Users and Companies

The good news is that all Claude 4 models are immediately available worldwide. The web interface at claude.ai supports dozens of languages with excellent quality. Pricing is set aggressively. The Claude Pro subscription, which unlocks the Opus model, costs $25 per month. API pricing is on average 10–20% lower than comparable OpenAI models, which can be a decisive factor for startups and companies integrating AI into their products.

Is There Still a Sustainable Moat in AI?

The rapid rise of Anthropic reopens the debate about "AI moats" — sustainable competitive advantages. It was long believed that OpenAI's advantage, built on massive data volume, enormous compute, and top talent, was impenetrable. The success of Claude 4 shows that innovative model architectures and more efficient training methods can quickly erase this lead.

Investors and analysts are now watching closely to see whether the market will split among a few dominant players (OpenAI, Google, Anthropic, Meta), or whether space will open for smaller, specialized companies. For customers, this competition is unambiguously positive — it brings faster innovation, higher quality, and lower prices.

In conclusion, 2026 is becoming a pivotal moment in the history of artificial intelligence. OpenAI's hegemony is broken and Anthropic with Claude 4 has become a full-fledged rival. For the global AI landscape this means better availability of cutting-edge tools, improved multilingual support, and the opportunity for companies to build on the world's most advanced technologies.

How can I try the Claude 4 models?

The easiest path is through the web interface at claude.ai, where the Sonnet model is available for free after registration. Access to the most powerful Opus model requires a Claude Pro subscription. Developers can use the API, whose documentation is available on the Anthropic website.

Is Anthropic a safer alternative to OpenAI?

Anthropic places great emphasis on AI safety and ethics, which is the foundation of their approach called "Constitutional AI." The goal is to create models that follow a set of principles (a constitution) to minimize harmful outputs. While this approach is promising, no AI model is 100% safe and it's always necessary to use it responsibly and with critical thinking.