Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis...
Model details →Anthropic: Claude Opus 5 vs Anthropic: Claude Sonnet 5.5
Anthropic: Claude Sonnet 5.5 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 5 | Anthropic: Claude Sonnet 5.5 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1M | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $5.00 | $2.00 | 🏆 Anthropic: Claude Sonnet 5.5 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $25.00 | $10.00 | 🏆 Anthropic: Claude Sonnet 5.5 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Opus 5 better than Anthropic: Claude Sonnet 5.5?
Anthropic: Claude Sonnet 5.5 wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Opus 5 and Anthropic: Claude Sonnet 5.5?
Input: $5.00 vs $2.00 per 1M tokens. Output: $25.00 vs $10.00 per 1M tokens.
What context windows do Anthropic: Claude Opus 5 and Anthropic: Claude Sonnet 5.5 support?
Anthropic: Claude Opus 5 supports up to 1M tokens. Anthropic: Claude Sonnet 5.5 supports up to 1M tokens.
Do both Anthropic: Claude Opus 5 and Anthropic: Claude Sonnet 5.5 support tool calling?
Anthropic: Claude Opus 5: yes. Anthropic: Claude Sonnet 5.5: yes.