Claude Sonnet 5
Anthropic
Key facts · verified Oct 30, 2026
Claude Sonnet 5 is an Anthropic model released on 30 Jun 2026. Its API price is $2 per million input tokens and $10 per million output tokens. Its context window is 1M tokens. It ranks #59 on LMArena's text leaderboard (Elo 1462, read 1 Nov 2026). Source: platform.claude.com.
Claude Sonnet 5 is an Anthropic model released on June 30, 2026 with a 1M-token context window. Its launch pricing of $2 per million input tokens and $10 per million output tokens, originally introductory through August 2026, was made permanent on August 10, 2026. Anthropic lists it as a legacy model since Claude Sonnet 5.5 was released on September 28, 2026.
Pricing & specs checkedSource: vendor documentation · checked Oct 30, 2026LMArena: 1462 Elo (rank 59, high effort) · source · retrieved Nov 1, 2026
Key Features
Agentic Coding Adaptive Thinking Vision Long Context Tool Use 128k Max Output
Full Specifications
$2 / $10 per million tokens | |
|---|---|
| Identity | |
| Developer | Anthropic |
| Released | Jun 2026 |
| Status | Available (legacy) |
| Licence | Proprietary |
| Self-hostable | No |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $4.000 / 1M tokens |
| Input price | $2.000 / 1M tokens |
| Output price | $10.000 / 1M tokens |
| Cached input | $0.20 / 1M tokens (cache hit) |
| Batch discount | 50% off input/output (Batch API) |
| Free tier | Small trial credit for new accounts, no ongoing free tier |
| Capacity | |
| Context window | 1M tokens |
| Max output | 128k tokens |
| Long-context surcharge | None (full 1M window at standard pricing) |
| Capability | |
| Vision in | Yes |
| Audio in | No |
| Function calling | Yes |
| Structured output | Yes |
| Extended reasoning | No (adaptive thinking instead) |
| Web search | Yes |
| Code execution | Yes |
| Access | |
| API | Yes |
| Chat app | Yes |
| Cloud marketplaces | AWS Bedrock, Google Cloud, Microsoft Foundry |
| Fine-tuning | No |
| Measured quality | |
| LMArena Elo | 1462 (checked Nov 2026) |
| LMArena rank | Rank 59 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 366 |