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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.

Claude Opus 4.1 is Anthropic's flagship text generation model, released on August 5, 2025 as an upgrade to Claude Opus 4. It is designed for demanding workflows that require sustained reasoning across long, multi-step tasks, with particular strength in software development, autonomous research, and agentic problem solving. The model supports a 200,000-token context window, up to 32,000 output tokens, and accepts both text and image inputs. It is multilingual, with documented support for French, Arabic, Mandarin, Japanese, Korean, Spanish, and Hindi.

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.