Claude Opus 4.1
Key facts · verified Oct 29, 2026
Claude Opus 4.1 is an Anthropic model. It was retired on 5 August 2026. Its last listed API price was $15 per million input tokens and $75 per million output tokens. Its context window is 200K tokens. It ranks #83 on LMArena's text leaderboard (Elo 1448, read 2 Nov 2026). Source: platform.claude.com.
Claude Opus 4.1 Thinking 16K is the LMArena listing of Anthropic's Claude Opus 4.1 (claude-opus-4-1-20250805) with extended thinking. Anthropic deprecated the model on June 5, 2026 and it was available on the Claude API until it was retired on August 5, 2026; Amazon Bedrock lists it as legacy with end of life on January 8, 2027. It was priced at $15 per million input tokens and $75 per million output tokens, with a 200K-token context window. 1448 Elo (rank 83)
Full Specifications
$15 / $75 per million tokens | |
|---|---|
| Identity | |
| Developer | Anthropic |
| Retired | 5 August 2026 |
| Status | Retired. Anthropic retired claude-opus-4-1-20250805 on the Claude API on 5 August 2026; Amazon Bedrock lists it as legacy with end of life on 8 January 2027. |
| Licence | Proprietary |
| Self-hostable | No |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $30.000 / 1M tokens |
| Input price | $15.000 / 1M tokens |
| Output price | $75.000 / 1M tokens |
| Capacity | |
| Context window | 200K tokens |
| Measured quality | |
| LMArena Elo | 1448 (checked Nov 2026) |
| LMArena rank | Rank 83 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 48 |