Claude Sonnet 4.6
Anthropic
Key facts · verified Oct 29, 2026
Claude Sonnet 4.6 is an Anthropic model released on 17 Feb 2026. Its API price is $3 per million input tokens and $15 per million output tokens. Its context window is 1M tokens. It ranks #46 on LMArena's text leaderboard (Elo 1472, read 1 Nov 2026). Source: platform.claude.com.
Claude Sonnet 4.6 is an Anthropic model released on February 17, 2026, priced at $3 per million input tokens and $15 per million output tokens, with a 1M-token context window and manual extended thinking, which Anthropic lists as deprecated. Anthropic lists it as a legacy model, names Claude Sonnet 5.5 as the current Sonnet model, and recommends migrating to it.
Pricing & specs checkedSource: vendor documentation · checked Oct 29, 2026LMArena: 1472 Elo (rank 46) · source · retrieved Nov 1, 2026
Key Features
Agentic Coding Adaptive Thinking Vision Long Context Tool Use 128k Max Output
Full Specifications
$3 / $15 per million tokens | |
|---|---|
| Identity | |
| Developer | Anthropic |
| Released | Feb 2026 |
| Status | Available (legacy) |
| Licence | Proprietary |
| Self-hostable | No |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $6.000 / 1M tokens |
| Input price | $3.000 / 1M tokens |
| Output price | $15.000 / 1M tokens |
| Cached input | $0.30 / 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 | Yes (deprecated) |
| 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 | 1472 (checked Nov 2026) |
| LMArena rank | Rank 46 |
| SWE-bench Verified | 75 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 245 |