# Claude Sonnet 5

> Claude Sonnet 5 is the current generation of Anthropic's Sonnet family, launched June 30, 2026. It costs $2 / $10 per 1M input/output tokens on the API and has a 1M-token context window with 128k max output. In Claude Code the `sonnet` alias points to it on the Anthropic API.

URL: https://aistack.sh/model/claude-sonnet-5
Vendor: Anthropic (product page: https://aistack.sh/tool/claude)
Last checked against sources: 2026-09-24

## Specs

- Released: Jun 30, 2026
- Status: Available
- API model ID: claude-sonnet-5
- API price (in / out): $2 / $10 per 1M tokens
- Context window: 1M tokens
- Platforms: Claude API

## Where you can use it

- Claude Code (https://aistack.sh/tool/claude-code): The `sonnet` alias resolves to Sonnet 5 on the Anthropic API.
- The $2 / $10 introductory price became the standard price on August 10, 2026; the planned rise to $3 / $15 was cancelled.

## FAQ

### How much does Claude Sonnet 5 cost?

$2 per 1M input tokens and $10 per 1M output tokens. That started as introductory pricing and became the standard price on August 10, 2026.

### What is the Claude Sonnet 5 context window?

1M tokens, with up to 128k output tokens.

### Does Claude Sonnet 5 use more tokens than Sonnet 4.6?

Anthropic says Sonnet 5 uses a new tokenizer that produces about 30% more tokens for the same text; the exact increase depends on the content.

## Sources

- [Claude Developer Platform release notes](https://platform.claude.com/docs/en/release-notes/overview), read 2026-09-24
- [Claude API pricing](https://platform.claude.com/docs/en/about-claude/pricing), read 2026-09-24
- [Claude models overview](https://platform.claude.com/docs/en/about-claude/models/overview), read 2026-09-24
- [Claude Code model configuration](https://code.claude.com/docs/en/model-config), read 2026-09-24