Side-by-side technical and economic comparison between OpenAI's OpenAI o1 and Anthropic's Claude Opus 5.
| Metric | OpenAI o1 | Claude Opus 5 | Advantage |
|---|---|---|---|
| Provider Organization | OpenAI | Anthropic | — |
| Standard Input / 1M | $15.00 | $5.00 | Claude Opus 5 (67% lower) |
| Cached Input / 1M | $7.50 | $0.50 | Claude Opus 5 lower |
| Output / 1M | $60.00 | $25.00 | Claude Opus 5 lower |
| Context Window | 200k | 1M | Claude Opus 5 (1M) |
| Max Generation Tokens | 100k | 16.4k | OpenAI o1 |
| Tokenizer Family | OpenAI o200k_base (200k vocabulary) | Anthropic Claude BPE (~65k vocabulary) | — |
Opt for OpenAI o1 when your engineering requirements prioritize OpenAI's ecosystem, specific tokenizer efficiencies (Exact BPE (o200k_base)), or when your expected prompt-to-completion ratios favor its $15/M input rate.
Opt for Claude Opus 5 when looking for Anthropic's tooling integration, specific context window depth (1M tokens), or when output generation volume favors its $25/M rate.