Prior Opus generation with 200k context (per Anthropic models overview).
Model details →Claude Opus 4.5 vs DeepSeek Reasoner (legacy id)
Claude Opus 4.5 and DeepSeek Reasoner (legacy id) are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
Legacy compatibility id mapping to DeepSeek V4 Flash thinking mode (per DeepSeek pricing notes).
Model details →Side-by-side comparison
| Capability | Claude Opus 4.5 | DeepSeek Reasoner (legacy id) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 200K | 1M | 🏆 DeepSeek Reasoner (legacy id) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | Custom | Custom | — |
| Output price (per 1M) Cost per million output tokens billed by the provider. | Custom | Custom | — |
| Tool / function calling First-class support for emitting structured tool calls. | — | — | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 Claude Opus 4.5 |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | — | — | Tie |
Frequently asked questions
Is Claude Opus 4.5 better than DeepSeek Reasoner (legacy id)?
Claude Opus 4.5 and DeepSeek Reasoner (legacy id) are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between Claude Opus 4.5 and DeepSeek Reasoner (legacy id)?
Input: Custom vs Custom per 1M tokens. Output: Custom vs Custom per 1M tokens.
What context windows do Claude Opus 4.5 and DeepSeek Reasoner (legacy id) support?
Claude Opus 4.5 supports up to 200K tokens. DeepSeek Reasoner (legacy id) supports up to 1M tokens.
Do both Claude Opus 4.5 and DeepSeek Reasoner (legacy id) support tool calling?
Claude Opus 4.5: not advertised. DeepSeek Reasoner (legacy id): not advertised.