Anthropic released Claude Sonnet 5.5 just in time for OpenAI's annual developer conference. This new model, positioned as a versatile daily assistant, breaks the so-called impossible triangle of speed, low cost, and high quality—speed increased by 30% compared to the previous Sonnet 5, single-task cost reduced by up to 30%, priced at half of Opus 5.5, with performance almost matching, and even surpassing its own premium models in several tests like Terminal-Bench 4.0.
The most convincing proof of its intelligence is its performance in games. Sonnet 5.5 became the first Sonnet model to complete "Pokémon Red" by only watching screenshots—without using memory modification or built-in guides, it understood the world, made decisions, and advanced the story frame by frame, integrating visual understanding and long-term planning into one brain.
Its capabilities go far beyond coding. It performs exceptionally well in scenarios such as office work, design, and 3D simulation, and supports five levels of Effort Level adjustment: low and medium levels are ideal for routine tasks, offering excellent value for money; however, when the highest level is fully activated, the output token volume increases dramatically, potentially making the cost exceed that of the larger Opus 5.5, and even leading to a performance drop—meaning higher levels aren't always better; you need to adjust based on the workload.
The moat has been further strengthened. Sonnet 5.5 includes anti-distillation mechanisms and features cybersecurity protection at the same level as Opus, preventing others from learning from its model while ensuring security standards match those of flagship products. When Anthropic released Sonnet 5.5 at half the price, with performance on par and even a real-world demonstration of completing Pokémon, it clearly aimed not only at developers' wallets but also at pricing power in the entire mid-range market.
