Claude 2.1 vs Claude Opus 4.5 (latest)
Both have similar output pricing, while Claude Opus 4.5 (latest) offers a larger context window. Choose Claude 2.1 or Claude Opus 4.5 (latest) based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude 2.1 | Claude Opus 4.5 (latest) |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input / 1M tokens | — | $5.00 |
| Output / 1M tokens | — | $25.00 |
| Context window | — | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Nov 2023 | Nov 2025 |
FAQ
Is Claude 2.1 or Claude Opus 4.5 (latest) cheaper?
Claude 2.1 and Claude Opus 4.5 (latest) have comparable output pricing.
Which has the larger context window, Claude 2.1 or Claude Opus 4.5 (latest)?
Claude Opus 4.5 (latest) has the larger context window (200K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.