Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Model details →Anthropic: Claude Opus 5.5 vs DeepSeek: DeepSeek V4 Pro 0423
DeepSeek: DeepSeek V4 Pro 0423 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
DeepSeek V4 Pro is a large-scale Mixture-of-Experts model from DeepSeek with 1.6T total parameters and 49B activated parameters, supporting a 1M-token context window. It is designed for advanced reasoning, coding,...
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 5.5 | DeepSeek: DeepSeek V4 Pro 0423 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1.0M | 🏆 DeepSeek: DeepSeek V4 Pro 0423 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $4.00 | $0.96 | 🏆 DeepSeek: DeepSeek V4 Pro 0423 |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $20.00 | $1.91 | 🏆 DeepSeek: DeepSeek V4 Pro 0423 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 Anthropic: Claude Opus 5.5 |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Opus 5.5 better than DeepSeek: DeepSeek V4 Pro 0423?
DeepSeek: DeepSeek V4 Pro 0423 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Opus 5.5 and DeepSeek: DeepSeek V4 Pro 0423?
Input: $4.00 vs $0.96 per 1M tokens. Output: $20.00 vs $1.91 per 1M tokens.
What context windows do Anthropic: Claude Opus 5.5 and DeepSeek: DeepSeek V4 Pro 0423 support?
Anthropic: Claude Opus 5.5 supports up to 1M tokens. DeepSeek: DeepSeek V4 Pro 0423 supports up to 1.0M tokens.
Do both Anthropic: Claude Opus 5.5 and DeepSeek: DeepSeek V4 Pro 0423 support tool calling?
Anthropic: Claude Opus 5.5: yes. DeepSeek: DeepSeek V4 Pro 0423: yes.