Compare Claude AI Models

Opus 4.6 is the flagship model with 128K max output, while Sonnet 4.6 offers the best speed-intelligence balance at lower cost. Both models now support adaptive thinking. Opus excels at complex, multi-step reasoning tasks, while Sonnet 4.6 is the default for Claude Code and ideal for production workloads.

Opus 4.6 and Haiku 4.5 represent the two extremes of the Claude model family. Opus is the most capable with 128K output and adaptive thinking, while Haiku is the fastest and most affordable at $1/$5 per MTok.

Sonnet 4.6 and Haiku 4.5 are the two most commonly used Claude models. Sonnet 4.6 provides higher quality reasoning with adaptive thinking and is the default for Claude Code, while Haiku offers the fastest responses at the lowest price point.

Sonnet 4.6 is the latest upgrade to the Sonnet line, replacing 4.5 as the default model for Claude Code and claude.ai. The biggest upgrade is adaptive thinking, previously exclusive to Opus. Sonnet 4.6 achieves a 70% user preference win rate over 4.5 and scores 80.2% on SWE-bench. Same pricing at $3/$15 per MTok.