Claude 2.1
API ID claude-2.1
claude-2.1 was an Anthropic model.
- Status
- Retired
- Released
- —
- Shutdown
- Jul 21, 2025
- Replacement
- Claude Opus 4.8claude-opus-4-8
claude-2.1 stopped serving on July 21, 2025. Recommended replacement: claude-opus-4-8.
How to migrate to Claude Opus 4.8
Benchmarks
Scores as each source published themComparing with Claude 2.0, the previous model in this line. A score is compared only with the same benchmark from the same source, at the same setting where both have it. Full comparison: prices, limits, features
Epoch AI
| Benchmark | Claude 2.1 | Claude 2.0 | Change | Setting | Run | Source |
|---|---|---|---|---|---|---|
| GPQA Diamond | 33.0% | 34.7% | −1.7 pts | Jan 27, 2025 | source | |
| OTIS Mock AIME 2024-2025 | 1.9% | 2.5% | −0.6 pts | Mar 7, 2025 | source |
Run independently by Epoch AI. Data: Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.
Price history
USD per 1M tokens, standard tierNo price history yet.
Prices
USD per 1M tokens, every type and band, by tierNo published prices.
Changelog
Changes we detected on Anthropic's pagesNo changes recorded yet.
Last checked · Sources: Anthropic models, Anthropic deprecations, Anthropic pricing, Anthropic model pages