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GPT-4 is a large language model developed by OpenAI and released in March 2023 as part of the Generative Pre-trained Transformer series. It accepts text input and produces text output, with a context window of 8,192 tokens, and its training data has a knowledge cutoff of April 2023. GPT-4 was designed to improve on earlier GPT models in areas such as instruction following, contextual understanding, and factual accuracy across a wide range of topics.

Claude 3 Haiku is a text generation model developed by Anthropic, positioned as the fastest and most affordable model in the Claude 3 family. It features a 200,000-token context window and vision capabilities, making it suitable for tasks that require processing large documents or analyzing images alongside text. The model's training data has a cutoff of August 2023.

Claude Opus 4 is a text generation model released by Anthropic on May 22, 2025. It is a hybrid model that supports both near-instant responses and extended thinking, allowing it to alternate between multi-step reasoning and tool use — such as web search — within a single workflow. The model carries a 200,000-token context window and supports vision, function calling, prompt caching, and structured outputs. On release, it scored 72.5% on SWE-bench Verified, 79.6% on GPQA Diamond, and 75.5% on AIME 2025.

Claude Sonnet 4 (claude-sonnet-4-20250514) is a text generation model developed by Anthropic and released on May 22, 2025. It sits in the mid-tier of Anthropic's Claude 4 model family, designed to balance capability with computational efficiency for production use. The model supports a 200,000-token context window and accepts text, images, and PDFs as input. It includes an optional extended thinking mode that allows the model to perform step-by-step reasoning when tasks require greater depth.

Compare Claude 4 Opus and Claude 4 Sonnet across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for reasoning-heavy tasks versus reasoning-heavy tasks.

Compare Claude 4 Opus and Claude 4.5 Haiku across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for reasoning-heavy tasks versus reasoning-heavy tasks.

Compare Claude 4 Opus and Claude 4.5 Sonnet across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for reasoning-heavy tasks versus reasoning-heavy tasks.

Compare Claude 4 Opus and Claude 4.6 Sonnet across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for reasoning-heavy tasks versus long-context workloads.