Claude 4 Family: Opus 4.7, Opus 4.5, and Sonnet 4.6 Side by Side

Three Tiers, One Generation

The Claude 4 family is not a single model with settings. It is three distinct products with different capability profiles and price points. Opus 4.7 is the flagship. Opus 4.5 is the previous generation flagship — still strong, now positioned as a mid-tier option. Sonnet 4.6 is the workhorse that handles most daily development tasks without the flagship price tag.

If you are coming from Claude 3.x, the jump is noticeable. Reasoning is sharper, tool use is more reliable, and the models handle ambiguous requirements better. The upgrade is worth it for any non-trivial work.

Where Opus 4.7 Wins

Opus 4.7 is the model to reach for when Sonnet keeps giving you wrong answers. It handles complex multi-step debugging, architectural decisions where competing trade-offs matter, and long contexts where you need the model to track state across many files. It also handles high context utilization more gracefully — when you are pushing toward the limits of the context window, Opus maintains coherence longer than the other tiers.

The trade-off is cost and latency. Opus 4.7 is the most expensive Claude model. Use it for tasks where being wrong is expensive, not for tasks where the answer is straightforward.

Where Opus 4.5 Fits

Opus 4.5 was the previous flagship. It still holds up — the context window is large enough for most codebase-scale work, and reasoning is solid for tasks that do not need the latest generation's improvements. If you have workflows running on Opus 4.5, there is no urgent reason to migrate unless you are hitting limits.

The gap to Opus 4.7 shows up on the hardest reasoning tasks and at very high context utilization. If you are deciding fresh, start with Sonnet 4.6 and move up to Opus 4.5 if you hit tasks where Sonnet is not cutting it. Only go to Opus 4.7 when Opus 4.5 also fails.

Where Sonnet 4.6 Lives

Sonnet 4.6 is the default for most development work. It handles feature implementation, test writing, refactoring, and bug fixes at roughly half the cost of Opus models. For tasks where you know what you want and can describe it clearly, Sonnet produces good results without the overhead of flagship reasoning.

The catch: Sonnet is more likely to produce confidently wrong answers on hard tasks. When you find yourself correcting it repeatedly on the same task, switch to Opus. The productivity loss from debugging Sonnet's wrong answers usually costs more than the Opus premium.

The Practical Progression

Start with Sonnet 4.6. Move to Opus 4.5 when you hit limits. Move to Opus 4.7 when Opus 4.5 fails. Most teams never need to go past Opus 4.5. If you are defaulting to Opus 4.7 for everything, you are probably spending more than you need to.