Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with memor…
Model details →Anthropic: Claude Sonnet 4.6 vs OpenAI: o3 Deep Research
Anthropic: Claude Sonnet 4.6 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
o3-deep-research is OpenAI's advanced model for deep research, designed to tackle complex, multi-step research tasks. Note: This model always uses the 'web_search' tool which adds additional cost.
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Sonnet 4.6 | OpenAI: o3 Deep Research | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 200K | 🏆 Anthropic: Claude Sonnet 4.6 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $3.00 | $10.00 | 🏆 Anthropic: Claude Sonnet 4.6 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $15.00 | $40.00 | 🏆 Anthropic: Claude Sonnet 4.6 |
| 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 Sonnet 4.6 better than OpenAI: o3 Deep Research?
Anthropic: Claude Sonnet 4.6 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Sonnet 4.6 and OpenAI: o3 Deep Research?
Input: $3.00 vs $10.00 per 1M tokens. Output: $15.00 vs $40.00 per 1M tokens.
What context windows do Anthropic: Claude Sonnet 4.6 and OpenAI: o3 Deep Research support?
Anthropic: Claude Sonnet 4.6 supports up to 1M tokens. OpenAI: o3 Deep Research supports up to 200K tokens.
Do both Anthropic: Claude Sonnet 4.6 and OpenAI: o3 Deep Research support tool calling?
Anthropic: Claude Sonnet 4.6: yes. OpenAI: o3 Deep Research: yes.